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Collagen
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Tropocollagen molecule: three left-handed procollagens (red, green, blue) join to form a right-handed triple helical tropocollagen.
Collagen /ˈkɒlədʒɪn/ is the main structural protein in the extracellular space in the various connective tissues in animal bodies. As the main component of connective tissue, it is the most abundant protein in mammals,[1] making up from 25% to 35% of the whole-body protein content. Collagen consists of amino acids wound together to form triple-helices to form of elongated fibrils.[2] It is mostly found in fibrous tissues such as tendons, ligaments and skin.
Depending upon the degree of mineralization, collagen tissues may be either rigid (bone) or compliant (tendon) or have a gradient from rigid to compliant (cartilage). It is also abundant in corneas, blood vessels, the gut, intervertebral discs, and the dentin in teeth.[3] In muscle tissue, it serves as a major component of the endomysium. Collagen constitutes one to two percent of muscle tissue and accounts for 6% of the weight of strong, tendinous muscles.[4] The fibroblast is the most common cell that creates collagen. Gelatin, which is used in food and industry, is collagen that has been irreversibly hydrolyzed.[5] Collagen also has many medical uses in treating complications of the bones and skin.
The name collagen comes from the Greek κόλλα (kólla), meaning "glue", and suffix -γέν, -gen, denoting "producing".[6][7] This refers to the compound's early use in the process of boiling the skin and tendons of horses and other animals to obtain glue.
Contents
1 Types
2 Medical uses
2.1 Cardiac applications
2.2 Cosmetic surgery
2.3 Bone grafts
2.4 Tissue regeneration
2.5 Reconstructive surgical uses
2.6 Wound care
3 As a supplement
4 Basic research
5 Veterinary use
6 Chemistry
7 Synthesis
7.1 Amino acids
7.2 Collagen I formation
7.3 Synthetic pathogenesis
8 Molecular structure
9 Associated disorders
10 Diseases
11 Characteristics
11.1 Uses
12 History
13 D-banding
14 See also
15 References
Types[edit]
Collagen occurs in many places throughout the body. Over 90% of the collagen in the human body, however, is type I.[8]
So far, 28 types of collagen have been identified and described. They can be divided into several groups according to the structure they form:
Fibrillar (Type I, II, III, V, XI)
Non-fibrillar
FACIT (Fibril Associated Collagens with Interrupted Triple Helices) (Type IX, XII, XIV, XIX, XXI)
Short chain (Type VIII, X)
Basement membrane (Type IV)
Multiplexin (Multiple Triple Helix domains with Interruptions) (Type XV, XVIII)
MACIT (Membrane Associated Collagens with Interrupted Triple Helices) (Type XIII, XVII)
Other (Type VI, VII)
The five most common types are:
Type I: skin, tendon, vasculature, organs, bone (main component of the organic part of bone)
Type II: cartilage (main collagenous component of cartilage)
Type III: reticulate (main component of reticular fibers), commonly found alongside type I.
Type IV: forms basal lamina, the epithelium-secreted layer of the basement membrane.
Type V: cell surfaces, hair, and placenta
Medical uses[edit]
Cardiac applications[edit]
The collagenous cardiac skeleton which includes the four heart valve rings, is histologically, elastically and uniquely bound to cardiac muscle. The cardiac skeleton also includes the separating septa of the heart chambers – the interventricular septum and the atrioventricular septum. Collagen contribution to the measure of cardiac performance summarily represents a continuous torsional force opposed to the fluid mechanics of blood pressure emitted from the heart. The collagenous structure that divides the upper chambers of the heart from the lower chambers is an impermeable membrane that excludes both blood and electrical impulses through typical physiological means. With support from collagen, atrial fibrillation should never deteriorate to ventricular fibrillation. Collagen is layered in variable densities with cardiac muscle mass. The mass, distribution, age and density of collagen all contribute to the compliance required to move blood back and forth. Individual cardiac valvular leaflets are folded into shape by specialized collagen under variable pressure. Gradual calcium deposition within collagen occurs as a natural function of aging. Calcified points within collagen matrices show contrast in a moving display of blood and muscle, enabling methods of cardiac imaging technology to arrive at ratios essentially stating blood in (cardiac input) and blood out (cardiac output). Pathology of the collagen underpinning of the heart is understood within the category of connective tissue disease.
Cosmetic surgery[edit]
Collagen has been widely used in cosmetic surgery, as a healing aid for burn patients for reconstruction of bone and a wide variety of dental, orthopedic, and surgical purposes. Both human and bovine collagen is widely used as dermal fillers for treatment of wrinkles and skin aging.[9] Some points of interest are:
When used cosmetically, there is a chance of allergic reactions causing prolonged redness; however, this can be virtually eliminated by simple and inconspicuous patch testing prior to cosmetic use.
Most medical collagen is derived from young beef cattle (bovine) from certified BSE-free animals. Most manufacturers use donor animals from either "closed herds", or from countries which have never had a reported case of BSE such as Australia, Brazil, and New Zealand.
Bone grafts[edit]
As the skeleton forms the structure of the body, it is vital that it maintains its strength, even after breaks and injuries. Collagen is used in bone grafting as it has a triple helical structure, making it a very strong molecule. It is ideal for use in bones, as it does not compromise the structural integrity of the skeleton. The triple helical structure of collagen prevents it from being broken down by enzymes, it enables adhesiveness of cells and it is important for the proper assembly of the extracellular matrix.[10]
Tissue regeneration[edit]
Collagen scaffolds are used in tissue regeneration, whether in sponges, thin sheets, or gels. Collagen has the correct properties for tissue regeneration such as pore structure, permeability, hydrophilicity, and being stable in vivo. Collagen scaffolds are also ideal for the deposition of cells such as osteoblasts and fibroblasts, and once inserted, growth is able to continue as normal in the tissue.[11]
Reconstructive surgical uses[edit]
Collagens are widely employed in the construction of the artificial skin substitutes used in the management of severe burns and wounds.[12][13] These collagens may be derived from bovine, equine, porcine, or even human sources; and are sometimes used in combination with silicones, glycosaminoglycans, fibroblasts, growth factors and other substances.
Wound care[edit]
Collagen is one of the body’s key natural resources and a component of skin tissue that can benefit all stages of the wound healing process.[14] When collagen is made available to the wound bed, closure can occur. Wound deterioration, followed sometimes by procedures such as amputation, can thus be avoided.
Collagen is a natural product and is thus used as a natural wound dressing and has properties that artificial wound dressings do not have. It is resistant against bacteria, which is of vital importance in a wound dressing. It helps to keep the wound sterile, because of its natural ability to fight infection. When collagen is used as a burn dressing, healthy granulation tissue is able to form very quickly over the burn, helping it to heal rapidly.[15]
Throughout the 4 phases of wound healing, collagen performs the following functions in wound healing:
Guiding function: Collagen fibers serve to guide fibroblasts. Fibroblasts migrate along a connective tissue matrix.
Chemotactic properties: The large surface area available on collagen fibers can attract fibrogenic cells which help in healing.
Nucleation: Collagen, in the presence of certain neutral salt molecules can act as a nucleating agent causing formation of fibrillar structures. A collagen wound dressing might serve as a guide for orienting new collagen deposition and capillary growth.
Hemostatic properties: Blood platelets interact with the collagen to make a hemostatic plug.
As a supplement[edit]
When hydrolyzed, collagen is reduced to small peptides, which can be ingested in the form of dietary supplement or functional foods and beverages with the intent to aid joint and bone health and enhance skin health.[16][17][18][19][20][21][22] Hydrolyzed collagen has a much smaller molecular weight in comparison to native collagen or gelatin, study suggests that more than 90% of hydrolyzed collagen is digested and available as small peptides in the blood stream within one hour. From the blood, the peptides (containing hydroxyproline) are transported into the target tissues (e.g., skin, bones, and cartilage), where the peptides act as building blocks for local cells and help boost the production of new collagen fibers.[23][24][25]
Basic research[edit]
Collagen is used in laboratory studies for cell culture, studying cell behavior and cellular interactions with the extracellular environment.[26]
Veterinary use[edit]
Some studies have shown efficacy of collagen supplementation for dogs with osteoarthritis pain, alone or in combination with other nutraceuticals like glucosamine and chondroitin.[27][28]
Chemistry[edit]
The collagen protein is composed of a triple helix, which generally consists of two identical chains (α1) and an additional chain that differs slightly in its chemical composition (α2).[29] The amino acid composition of collagen is atypical for proteins, particularly with respect to its high hydroxyproline content. The most common motifs in the amino acid sequence of collagen are glycine-proline-X and glycine-X-hydroxyproline, where X is any amino acid other than glycine, proline or hydroxyproline. The average amino acid composition for fish and mammal skin is given.[29]
Amino acid
Abundance in mammal skin
(residues/1000)
Abundance in fish skin
(residues/1000)
Glycine 329 339
Proline 126 108
Alanine 109 114
Hydroxyproline 95 67
Glutamic acid 74 76
Arginine 49 52
Aspartic acid 47 47
Serine 36 46
Lysine 29 26
Leucine 24 23
Valine 22 21
Threonine 19 26
Phenylalanine 13 14
Isoleucine 11 11
Hydroxylysine 6 8
Methionine 6 13
Histidine 5 7
Tyrosine 3 3
Cysteine 1 1
Tryptophan 0 0
Synthesis[edit]
First, a three-dimensional stranded structure is assembled, with the amino acids glycine and proline as its principal components. This is not yet collagen but its precursor, procollagen. Procollagen is then modified by the addition of hydroxyl groups to the amino acids proline and lysine. This step is important for later glycosylation and the formation of the triple helix structure of collagen. Because the hydroxylase enzymes that perform these reactions require vitamin C as a cofactor, a long-term deficiency in this vitamin results in impaired collagen synthesis and scurvy.[30] These hydroxylation reactions are catalyzed by two different enzymes: prolyl-4-hydroxylase[31] and lysyl-hydroxylase. Vitamin C also serves with them in inducing these reactions. In this service, one molecule of vitamin C is destroyed for each H replaced by OH. [32] The synthesis of collagen occurs inside and outside of the cell. The formation of collagen which results in fibrillary collagen (most common form) is discussed here. Meshwork collagen, which is often involved in the formation of filtration systems, is the other form of collagen. All types of collagens are triple helices, and the differences lie in the make-up of the alpha peptides created in step 2.
Transcription of mRNA: About 34 genes are associated with collagen formation, each coding for a specific mRNA sequence, and typically have the "COL" prefix. The beginning of collagen synthesis begins with turning on genes which are associated with the formation of a particular alpha peptide (typically alpha 1, 2 or 3).
Pre-pro-peptide formation: Once the final mRNA exits from the cell nucleus and enters into the cytoplasm, it links with the ribosomal subunits and the process of translation occurs. The early/first part of the new peptide is known as the signal sequence. The signal sequence on the N-terminal of the peptide is recognized by a signal recognition particle on the endoplasmic reticulum, which will be responsible for directing the pre-pro-peptide into the endoplasmic reticulum. Therefore, once the synthesis of new peptide is finished, it goes directly into the endoplasmic reticulum for post-translational processing. It is now known as pre-pro-collagen.
Pre-pro-peptide to pro-collagen: Three modifications of the pre-pro-peptide occur leading to the formation of the alpha peptide:
The signal peptide on the N-terminal is dissolved, and the molecule is now known as propeptide (not procollagen).
Hydroxylation of lysines and prolines on propeptide by the enzymes 'prolyl hydroxylase' and 'lysyl hydroxylase' (to produce hydroxyproline and hydroxylysine) occurs to aid cross-linking of the alpha peptides. This enzymatic step requires vitamin C as a cofactor. In scurvy, the lack of hydroxylation of prolines and lysines causes a looser triple helix (which is formed by three alpha peptides).
Glycosylation occurs by adding either glucose or galactose monomers onto the hydroxyl groups that were placed onto lysines, but not on prolines.
Once these modifications have taken place, three of the hydroxylated and glycosylated propeptides twist into a triple helix forming procollagen. Procollagen still has unwound ends, which will be later trimmed. At this point, the procollagen is packaged into a transfer vesicle destined for the Golgi apparatus.
Golgi apparatus modification: In the Golgi apparatus, the procollagen goes through one last post-translational modification before being secreted out of the cell. In this step, oligosaccharides (not monosaccharides as in step 3) are added, and then the procollagen is packaged into a secretory vesicle destined for the extracellular space.
Formation of tropocollagen: Once outside the cell, membrane bound enzymes known as 'collagen peptidases', remove the "loose ends" of the procollagen molecule. What is left is known as tropocollagen. Defects in this step produce one of the many collagenopathies known as Ehlers-Danlos syndrome. This step is absent when synthesizing type III, a type of fibrilar collagen.
Formation of the collagen fibril: lysyl oxidase, an extracellular copper-dependent enzyme, produces the final step in the collagen synthesis pathway. This enzyme acts on lysines and hydroxylysines producing aldehyde groups, which will eventually undergo covalent bonding between tropocollagen molecules. This polymer of tropocollogen is known as a collagen fibril.
Action of lysyl oxidase
Amino acids[edit]
Collagen has an unusual amino acid composition and sequence:
Glycine is found at almost every third residue.
Proline makes up about 17% of collagen.
Collagen contains two uncommon derivative amino acids not directly inserted during translation. These amino acids are found at specific locations relative to glycine and are modified post-translationally by different enzymes, both of which require vitamin C as a cofactor.
Hydroxyproline derived from proline
Hydroxylysine derived from lysine - depending on the type of collagen, varying numbers of hydroxylysines are glycosylated (mostly having disaccharides attached).
Cortisol stimulates degradation of (skin) collagen into amino acids.[33]
Collagen I formation[edit]
Most collagen forms in a similar manner, but the following process is typical for type I:
Inside the cell
Two types of alpha chains are formed during translation on ribosomes along the rough endoplasmic reticulum (RER): alpha-1 and alpha-2 chains. These peptide chains (known as preprocollagen) have registration peptides on each end and a signal peptide.
Polypeptide chains are released into the lumen of the RER.
Signal peptides are cleaved inside the RER and the chains are now known as pro-alpha chains.
Hydroxylation of lysine and proline amino acids occurs inside the lumen. This process is dependent on ascorbic acid (vitamin C) as a cofactor.
Glycosylation of specific hydroxylysine residues occurs.
Triple alpha helical structure is formed inside the endoplasmic reticulum from two alpha-1 chains and one alpha-2 chain.
Procollagen is shipped to the Golgi apparatus, where it is packaged and secreted by exocytosis.
Outside the cell
Registration peptides are cleaved and tropocollagen is formed by procollagen peptidase.
Multiple tropocollagen molecules form collagen fibrils, via covalent cross-linking (aldol reaction) by lysyl oxidase which links hydroxylysine and lysine residues. Multiple collagen fibrils form into collagen fibers.
Collagen may be attached to cell membranes via several types of protein, including fibronectin, laminin, fibulin and integrin.
Synthetic pathogenesis[edit]
Vitamin C deficiency causes scurvy, a serious and painful disease in which defective collagen prevents the formation of strong connective tissue. Gums deteriorate and bleed, with loss of teeth; skin discolors, and wounds do not heal. Prior to the 18th century, this condition was notorious among long-duration military, particularly naval, expeditions during which participants were deprived of foods containing vitamin C.
An autoimmune disease such as lupus erythematosus or rheumatoid arthritis[34] may attack healthy collagen fibers.
Many bacteria and viruses secrete virulence factors, such as the enzyme collagenase, which destroys collagen or interferes with its production.
Molecular structure[edit]
A single collagen molecule, tropocollagen, is used to make up larger collagen aggregates, such as fibrils. It is approximately 300 nm long and 1.5 nm in diameter, and it is made up of three polypeptide strands (called alpha peptides, see step 2), each of which has the conformation of a left-handed helix – this should not be confused with the right-handed alpha helix. These three left-handed helices are twisted together into a right-handed triple helix or "super helix", a cooperative quaternary structure stabilized by many hydrogen bonds. With type I collagen and possibly all fibrillar collagens, if not all collagens, each triple-helix associates into a right-handed super-super-coil referred to as the collagen microfibril. Each microfibril is interdigitated with its neighboring microfibrils to a degree that might suggest they are individually unstable, although within collagen fibrils, they are so well ordered as to be crystalline.
Three polypeptides coil to form tropocollagen. Many tropocollagens then bind together to form a fibril, and many of these then form a fibre.
A distinctive feature of collagen is the regular arrangement of amino acids in each of the three chains of these collagen subunits. The sequence often follows the pattern Gly-Pro-X or Gly-X-Hyp, where X may be any of various other amino acid residues.[29] Proline or hydroxyproline constitute about 1/6 of the total sequence. With glycine accounting for the 1/3 of the sequence, this means approximately half of the collagen sequence is not glycine, proline or hydroxyproline, a fact often missed due to the distraction of the unusual GX1X2 character of collagen alpha-peptides. The high glycine content of collagen is important with respect to stabilization of the collagen helix as this allows the very close association of the collagen fibers within the molecule, facilitating hydrogen bonding and the formation of intermolecular cross-links.[29] This kind of regular repetition and high glycine content is found in only a few other fibrous proteins, such as silk fibroin.
Collagen is not only a structural protein. Due to its key role in the determination of cell phenotype, cell adhesion, tissue regulation, and infrastructure, many sections of its non-proline-rich regions have cell or matrix association/regulation roles. The relatively high content of proline and hydroxyproline rings, with their geometrically constrained carboxyl and (secondary) amino groups, along with the rich abundance of glycine, accounts for the tendency of the individual polypeptide strands to form left-handed helices spontaneously, without any intrachain hydrogen bonding.
Because glycine is the smallest amino acid with no side chain, it plays a unique role in fibrous structural proteins. In collagen, Gly is required at every third position because the assembly of the triple helix puts this residue at the interior (axis) of the helix, where there is no space for a larger side group than glycine’s single hydrogen atom. For the same reason, the rings of the Pro and Hyp must point outward. These two amino acids help stabilize the triple helix—Hyp even more so than Pro; a lower concentration of them is required in animals such as fish, whose body temperatures are lower than most warm-blooded animals. Lower proline and hydroxyproline contents are characteristic of cold-water, but not warm-water fish; the latter tend to have similar proline and hydroxyproline contents to mammals.[29] The lower proline and hydroxproline contents of cold-water fish and other poikilotherm animals leads to their collagen having a lower thermal stability than mammalian collagen.[29] This lower thermal stability means that gelatin derived from fish collagen is not suitable for many food and industrial applications.
The tropocollagen subunits spontaneously self-assemble, with regularly staggered ends, into even larger arrays in the extracellular spaces of tissues.[35][36] Additional assembly of fibrils is guided by fibroblasts, which deposit fully formed fibrils from fibripositors. In the fibrillar collagens, molecules are staggered to adjacent molecules by about 67 nm (a unit that is referred to as ‘D’ and changes depending upon the hydration state of the aggregate). In each D-period repeat of the microfibril, there is a part containing five molecules in cross-section, called the “overlap”, and a part containing only four molecules, called the "gap".[37] These overlap and gap regions are retained as microfibrils assemble into fibrils, and are thus viewable using electron microscopy. The triple helical tropocollagens in the microfibrils are arranged in a quasihexagonal packing pattern.[37][38]
The D-period of collagen fibrils results in visible 67nm bands when observed by electron microscopy.
There is some covalent crosslinking within the triple helices, and a variable amount of covalent crosslinking between tropocollagen helices forming well organized aggregates (such as fibrils).[39] Larger fibrillar bundles are formed with the aid of several different classes of proteins (including different collagen types), glycoproteins, and proteoglycans to form the different types of mature tissues from alternate combinations of the same key players.[36] Collagen's insolubility was a barrier to the study of monomeric collagen until it was found that tropocollagen from young animals can be extracted because it is not yet fully crosslinked. However, advances in microscopy techniques (i.e. electron microscopy (EM) and atomic force microscopy (AFM)) and X-ray diffraction have enabled researchers to obtain increasingly detailed images of collagen structure in situ. These later advances are particularly important to better understanding the way in which collagen structure affects cell–cell and cell–matrix communication and how tissues are constructed in growth and repair and changed in development and disease.[40][41] For example, using AFM–based nanoindentation it has been shown that a single collagen fibril is a heterogeneous material along its axial direction with significantly different mechanical properties in its gap and overlap regions, correlating with its different molecular organizations in these two regions.[42]
Collagen fibrils/aggregates are arranged in different combinations and concentrations in various tissues to provide varying tissue properties. In bone, entire collagen triple helices lie in a parallel, staggered array. 40 nm gaps between the ends of the tropocollagen subunits (approximately equal to the gap region) probably serve as nucleation sites for the deposition of long, hard, fine crystals of the mineral component, which is hydroxylapatite (approximately) Ca10(OH)2(PO4)6.[43] Type I collagen gives bone its tensile strength.
Associated disorders[edit]
Collagen-related diseases most commonly arise from genetic defects or nutritional deficiencies that affect the biosynthesis, assembly, postranslational modification, secretion, or other processes involved in normal collagen production.
Genetic Defects of Collagen Genes
Type Notes Gene(s) Disorders
I This is the most abundant collagen of the human body. It is present in scar tissue, the end product when tissue heals by repair. It is found in tendons, skin, artery walls, cornea, the endomysium surrounding muscle fibers, fibrocartilage, and the organic part of bones and teeth. COL1A1, COL1A2 Osteogenesis imperfecta, Ehlers–Danlos syndrome, Infantile cortical hyperostosis a.k.a. Caffey's disease
II Hyaline cartilage, makes up 50% of all cartilage protein. Vitreous humour of the eye. COL2A1 Collagenopathy, types II and XI
III This is the collagen of granulation tissue and is produced quickly by young fibroblasts before the tougher type I collagen is synthesized. Reticular fiber. Also found in artery walls, skin, intestines and the uterus COL3A1 Ehlers–Danlos syndrome, Dupuytren's contracture
IV Basal lamina; eye lens. Also serves as part of the filtration system in capillaries and the glomeruli of nephron in the kidney. COL4A1, COL4A2, COL4A3, COL4A4, COL4A5, COL4A6 Alport syndrome, Goodpasture's syndrome
V Most interstitial tissue, assoc. with type I, associated with placenta COL5A1, COL5A2, COL5A3 Ehlers–Danlos syndrome (Classical)
VI Most interstitial tissue, assoc. with type I COL6A1, COL6A2, COL6A3, COL6A5 Ulrich myopathy, Bethlem myopathy, Atopic dermatitis[44]
VII Forms anchoring fibrils in dermoepidermal junctions COL7A1 Epidermolysis bullosa dystrophica
VIII Some endothelial cells COL8A1, COL8A2 Posterior polymorphous corneal dystrophy 2
IX FACIT collagen, cartilage, assoc. with type II and XI fibrils COL9A1, COL9A2, COL9A3 EDM2 and EDM3
X Hypertrophic and mineralizing cartilage COL10A1 Schmid metaphyseal dysplasia
XI Cartilage COL11A1, COL11A2 Collagenopathy, types II and XI
XII FACIT collagen, interacts with type I containing fibrils, decorin and glycosaminoglycans COL12A1 –
XIII Transmembrane collagen, interacts with integrin a1b1, fibronectin and components of basement membranes like nidogen and perlecan. COL13A1 –
XIV FACIT collagen, also known as undulin COL14A1 –
XV – COL15A1 –
XVI – COL16A1 –
XVII Transmembrane collagen, also known as BP180, a 180 kDa protein COL17A1 Bullous pemphigoid and certain forms of junctional epidermolysis bullosa
XVIII Source of endostatin COL18A1 –
XIX FACIT collagen COL19A1 –
XX – COL20A1 –
XXI FACIT collagen COL21A1 –
XXII – COL22A1 –
XXIII MACIT collagen COL23A1 –
XXIV – COL24A1 –
XXV – COL25A1 –
XXVI – EMID2 –
XXVII – COL27A1 –
XXVIII – COL28A1 –
XXIX Epidermal collagen COL29A1 Atopic Dermatitis[45]
In addition to the above-mentioned disorders, excessive deposition of collagen occurs in scleroderma.
Diseases[edit]
One thousand mutations have been identified in 12 out of more than 20 types of collagen. These mutations can lead to various diseases at the tissue level.[46]
Osteogenesis imperfecta – Caused by a mutation in type 1 collagen, dominant autosomal disorder, results in weak bones and irregular connective tissue, some cases can be mild while others can be lethal. Mild cases have lowered levels of collagen type 1 while severe cases have structural defects in collagen.[47]
Chondrodysplasias – Skeletal disorder believed to be caused by a mutation in type 2 collagen, further research is being conducted to confirm this.[48]
Ehlers-Danlos syndrome – Six different types of this disorder, which lead to deformities in connective tissue, are known. Some types can be lethal, leading to the rupture of arteries. Each syndrome is caused by a different mutation, for example type four of this disorder is caused by a mutation in collagen type 3.[49]
Alport syndrome – Can be passed on genetically, usually as X-linked dominant, but also as both an autosomal dominant and autosomal recessive disorder, sufferers have problems with their kidneys and eyes, loss of hearing can also develop in during the childhood or adolescent years.[50]
Osteoporosis – Not inherited genetically, brought on with age, associated with reduced levels of collagen in the skin and bones, growth hormone injections are being researched as a possible treatment to counteract any loss of collagen.[51]
Knobloch syndrome – Caused by a mutation in the COL18A1 gene that codes for the production of collagen XVIII. Patients present with protrusion of the brain tissue and degeneration of the retina; an individual who has family members suffering from the disorder is at an increased risk of developing it themselves since there is a hereditary link.[46]
Characteristics[edit]
Collagen is one of the long, fibrous structural proteins whose functions are quite different from those of globular proteins, such as enzymes. Tough bundles of collagen called collagen fibers are a major component of the extracellular matrix that supports most tissues and gives cells structure from the outside, but collagen is also found inside certain cells. Collagen has great tensile strength, and is the main component of fascia, cartilage, ligaments, tendons, bone and skin.[52][53] Along with elastin and soft keratin, it is responsible for skin strength and elasticity, and its degradation leads to wrinkles that accompany aging.[9] It strengthens blood vessels and plays a role in tissue development. It is present in the cornea and lens of the eye in crystalline form. It may be one of the most abundant proteins in the fossil record, given that it appears to fossilize frequently, even in bones from the Mesozoic and Paleozoic.[54]
Uses[edit]
Collagen has a wide variety of applications, from food to medical. For instance, it is used in cosmetic surgery and burn surgery. It is widely used in the form of collagen casings for sausages, which are also used in the manufacture of musical strings.
If collagen is subject to sufficient denaturation, e.g. by heating, the three tropocollagen strands separate partially or completely into globular domains, containing a different secondary structure to the normal collagen polyproline II (PPII), e.g. random coils. This process describes the formation of gelatin, which is used in many foods, including flavored gelatin desserts. Besides food, gelatin has been used in pharmaceutical, cosmetic, and photography industries.
From the Greek for glue, kolla, the word collagen means "glue producer" and refers to the early process of boiling the skin and sinews of horses and other animals to obtain glue. Collagen adhesive was used by Egyptians about 4,000 years ago, and Native Americans used it in bows about 1,500 years ago. The oldest glue in the world, carbon-dated as more than 8,000 years old, was found to be collagen—used as a protective lining on rope baskets and embroidered fabrics, and to hold utensils together; also in crisscross decorations on human skulls.[55] Collagen normally converts to gelatin, but survived due to dry conditions. Animal glues are thermoplastic, softening again upon reheating, so they are still used in making musical instruments such as fine violins and guitars, which may have to be reopened for repairs—an application incompatible with tough, synthetic plastic adhesives, which are permanent. Animal sinews and skins, including leather, have been used to make useful articles for millennia.
Gelatin-resorcinol-formaldehyde glue (and with formaldehyde replaced by less-toxic pentanedial and ethanedial) has been used to repair experimental incisions in rabbit lungs.[56]
History[edit]
The molecular and packing structures of collagen have eluded scientists over decades of research. The first evidence that it possesses a regular structure at the molecular level was presented in the mid-1930s.[57][58] Since that time, many prominent scholars, including Nobel laureates Crick, Pauling, Rich and Yonath, and others, including Brodsky, Berman, and Ramachandran, concentrated on the conformation of the collagen monomer. Several competing models, although correctly dealing with the conformation of each individual peptide chain, gave way to the triple-helical "Madras" model of Ramachandran, which provided an essentially correct model of the molecule's quaternary structure[59][60][61] although this model still required some refinement.[62][clarification needed] [63][64][65][66] The packing structure of collagen has not been defined to the same degree outside of the fibrillar collagen types, although it has been long known to be hexagonal or quasi-hexagonal.[38][67][68] As with its monomeric structure, several conflicting models alleged that either the packing arrangement of collagen molecules is 'sheet-like' or microfibrillar.[62][69][70] The microfibrillar structure of collagen fibrils in tendon, cornea and cartilage has been directly imaged by electron microscopy.[71][72][73] The microfibrillar structure of tail tendon, as described by Fraser, Miller, and Wess (amongst others), was modeled as being closest to the observed structure,[62] although it oversimplified the topological progression of neighboring collagen molecules, and hence did not predict the correct conformation of the discontinuous D-periodic pentameric arrangement termed simply: the microfibril.[37][74][75] Various cross linking agents like L-Dopaquinone, embeline, potassium embelate and 5-O-methyl embelin could be developed as potential cross-linking/stabilization agents of collagen preparation and its application as wound dressing sheet in clinical applications is enhanced.[76]
The evolution of collagens was a fundamental step in the early evolution of life, supporting the coalescence of multicellular life forms.[77]
D-banding[edit]
Collagen D-banding is viable as periodic formation of ridging on all fibrils forming collagen[78]. D-bands are created due to the semi-crystalline formation of the collagen within the fibrils. The pattern exhibited by D-banding is consistently independent of fibril diameter[79]. When undergoing deformation, collagen fibrils may lose their D-banding, making the disappearance of the d-bands an indicator of the type of damage undergone by then tendon fibrils.
See also[edit]
Hydrolyzed collagen, a common form in which collagen is sold as a supplement
Animal glue
Gelatin
Fibrous protein
Osteoid, collagen-containing component of bone
Lysyl oxidase
Collagenase, the enzyme involved in collagen breakdown and remodeling
Hypermobility syndrome
MMP inhibitors
References[edit]
Jump up ^ Di Lullo, Gloria A.; Sweeney, Shawn M.; Körkkö, Jarmo; Ala-Kokko, Leena & San Antonio, James D. (2002). "Mapping the Ligand-binding Sites and Disease-associated Mutations on the Most Abundant Protein in the Human, Type I Collagen". J. Biol. Chem. 277 (6): 4223–4231. doi:10.1074/jbc.M110709200. PMID 11704682.
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Connective tissue
Physiology
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Reticular cell
Tendon cell
Adipocyte
Melanocyte
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Extracellular
matrix
Ground substance
Tissue fluid
Fibers
Collagen fibers
Reticular fibers
COL3A1
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Elastin
Fibrillin
FBN1
FBN2
FBN3
EMILIN1
Elaunin
Types
Proper
Loose
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Adipose
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White
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Dense irregular connective tissue
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Ligament
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Cartilage
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Protein: scleroproteins
Extracellular matrix
Collagen
Fibril forming
type I
COL1A1
COL1A2
type II (COL2A1)
type III
type V
COL5A1
COL5A2
COL5A3
COL24A1
COL26A1
Other
FACIT: type IX
COL9A1
COL9A2
COL9A3
type XII (COL12A1)
COL14A1
COL16A1
COL19A1
COL20A1
COL21A1
COL22A1
basement membrane: type IV
COL4A1
COL4A2
COL4A3
COL4A4
COL4A5
COL4A6
multiplexin: COL15A1
type XVIII
COL18A1
Endostatin
transmembrane: COL13A1
COL17A1
COL23A1
COL25A1
other: type VI
COL6A1
COL6A2
COL6A3
COL6A5
type VII (COL7A1)
type VIII
COL8A1
COL8A2
type X (COL10A1)
type XI
COL11A1
COL11A2
COL27A1
COL28A1
Enzymes
Prolyl hydroxylase/Lysyl hydroxylase
Cartilage associated protein/Leprecan
ADAMTS2
Procollagen peptidase
Lysyl oxidase
Laminin
alpha
LAMA1
LAMA2
LAMA3
LAMA4
LAMA5
beta
LAMB1
LAMB2
LAMB3
LAMB4
gamma
LAMC1
LAMC2
LAMC3
Other
ALCAM
Elastin
Tropoelastin
Vitronectin
FRAS1
FREM2
Decorin
FAM20C
ECM1
Matrix gla protein
Tectorin
TECTA
TECTB
Other
Keratin/Cytokeratin
Gelatin
Reticulin
Cartilage oligomeric matrix protein
Authority control
NDL: 00566622
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text:
Maze Runner: The Death Cure
From Wikipedia, the free encyclopedia
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For the book the film is based on, see The Death Cure.
Maze Runner: The Death Cure
Theatrical release poster
Directed by
Wes Ball
Produced by
Ellen Goldsmith-Vein
Wyck Godfrey
Marty Bowen
Joe Hartwick, Jr.
Wes Ball
Lee Stollman
Screenplay by
T.S. Nowlin
Based on
The Death Cure
by James Dashner
Starring
Dylan O'Brien
Kaya Scodelario
Thomas Brodie-Sangster
Nathalie Emmanuel
Giancarlo Esposito
Aidan Gillen
Walton Goggins
Ki Hong Lee
Barry Pepper
Will Poulter
Patricia Clarkson
Music by
John Paesano
Cinematography
Gyula Pados
Edited by
Dan Zimmerman
Paul Harb
Production
company
Gotham Group
Temple Hill Entertainment
Oddball Entertainment
Distributed by
20th Century Fox
Release date
January 11, 2018 (2018-01-11) (Seoul)
January 26, 2018 (2018-01-26) (United States)
Running time
142 minutes[1]
Country
United States
Budget
$62 million[2]
Box office
$288.3 million[2]
Maze Runner: The Death Cure (also known simply as The Death Cure) is a 2018 American dystopian science fiction action film directed by Wes Ball and written by T.S. Nowlin, based on the novel The Death Cure written by James Dashner. It is the sequel to the 2015 film Maze Runner: The Scorch Trials and the third and final installment in the Maze Runner film series. The film stars Dylan O'Brien, Kaya Scodelario, Thomas Brodie-Sangster, Dexter Darden, Nathalie Emmanuel, Giancarlo Esposito, Aidan Gillen, Walton Goggins, Ki Hong Lee, Jacob Lofland, Katherine McNamara, Barry Pepper, Will Poulter, Rosa Salazar, and Patricia Clarkson.
Maze Runner: The Death Cure was originally set to be released on February 17, 2017, in the United States by 20th Century Fox, but the studio rescheduled the film's release for January 26, 2018, in theatres and IMAX, allowing time for O'Brien to recover from injuries he sustained during filming. The film received mixed reviews from critics and grossed over $288 million worldwide.
Contents
1 Plot
2 Cast
3 Production
3.1 Filming
4 Release
4.1 Home media
5 Reception
5.1 Box office
5.2 Critical response
5.3 Accolades
6 References
7 External links
Plot[edit]
Thomas, Newt, and Frypan are the last of the free "Gladers" immune to the Flare virus that has ravaged the world's population. They and The Right Arm resistance conduct a rescue operation where they retrieve other Immunes from a train, which is owned by WCKD, an organization responsible for capturing and experimenting on immune children. They discover that Minho, their remaining Glader friend whom WCKD had captured, was not on that train, which is headed to "The Last City", WCKD's base of operations. Against the orders of Vince, leader of The Right Arm, the three leave their camp to rescue Minho, who is being tortured by WCKD in hopes of developing a cure for the virus. Heading for the Last City, the group is attacked by Cranks, humans infected with the Flare. However, they are saved by Jorge and Brenda, who join them.
The group makes it to the wall of the Last City, which protects the city from Cranks. Outside the wall, people are rallying in protest to be let into the city. When WCKD opens fire at the protesters, the group is captured by a contingent of masked men and are taken to a hideout. One of the masked men is revealed to be Gally, who survived Minho's attack. Gally takes them to see Lawrence, a rebellion leader for those outside the walls, who helps them enter the Last City through a secret entrance. Gally leads Thomas and Newt through to the city and, spotting Teresa, Gally tells Thomas that he can get them into WCKD headquarters. Newt then confides to Thomas that he is infected. Promising to cure him, the three capture Teresa.
Thomas, Newt, and Gally escort Teresa inside WCKD headquarters and toward the location of the Immunes. Gally looks after the Immune children and stays to find a serum that slows the Flare, while Thomas, Newt, and Teresa go to find Minho. They are discovered and chased by Janson. Teresa lets them escape to find Minho before rushing to do a blood test on Thomas' blood, which she obtained when removing trackers from the Gladers.
Having delivered the Immune children and the serum to Brenda, Gally returns to WCKD headquarters to find Thomas. Brenda is forced to flee with the Immune children to avoid capture. Thomas and Newt reunite with Minho in the medical wing. Teresa discovers that Thomas' blood can cure the Flare. She shares her discovery with WCKD's leader, Ava Paige, both agreeing that they must find Thomas. Brenda and the Immune children escape WCKD with Frypan's help. Meanwhile, Lawrence rallies his rebels outside the city before blowing a hole in the city wall, sacrificing himself to allow his allies and the infected people to storm the city. Gally finds Thomas, Minho, and Newt. Newt, sending Minho and Gally ahead to get the serum from Brenda, gives Thomas a pendant before passing out. Teresa transmits her voice throughout the city, telling Thomas that his blood can save Newt if he will only return to WCKD. Newt, nearly consumed by the Flare, regains consciousness and attacks Thomas, while begging Thomas to kill him. When Thomas will not, Newt–left with no other option–stabs himself.
Thomas makes his way back to WCKD and confronts Ava. However, she is killed by Janson, who is infected by the Flare. Janson knocks Thomas out and drags him to a lab where Teresa is ready to extract his blood. However, he reveals that he is only truly interested in curing himself and others that he feels are worthy, which results in Teresa turning on him. After a fight, Janson is killed, allowing Thomas and Teresa to escape to the rooftop, where Teresa gives Thomas a vial with the cure. Their allies suddenly appear in an aircraft: Thomas makes it aboard, but Teresa dies when the headquarters collapses in on itself.
The group reunites with the rest of the Immunes and The Right Arm, escaping to a safe haven, where the remaining population can live in safety. There, Thomas discovers that the pendant Newt gave him had a note in it. Still traumatized by his friends' deaths, he reads the note, in which Newt tells him to look after everyone.
Cast[edit]
Dylan O'Brien as Thomas
Kaya Scodelario as Teresa
Thomas Brodie-Sangster as Newt
Dexter Darden as Frypan
Nathalie Emmanuel as Harriet
Giancarlo Esposito as Jorge
Aidan Gillen as Janson
Walton Goggins as Lawrence
Ki Hong Lee as Minho
Jacob Lofland as Aris
Katherine McNamara as Sonya
Barry Pepper as Vince
Will Poulter as Gally
Rosa Salazar as Brenda
Patricia Clarkson as Ava Paige
Production[edit]
In March 2015, it was confirmed that T.S. Nowlin, who co-wrote the first and wrote the second film, would adapt Maze Runner: The Death Cure.[3] On September 16, 2015, it was confirmed that Ball would return to direct the final film.
Filming[edit]
Principal photography began on March 14, 2016, in Vancouver, British Columbia.[4][5] Previously it was revealed at San Diego Comic-Con International that filming would begin in February 2016.[6]
On March 18, 2016, it was reported that actor Dylan O'Brien was injured on set and was hospitalized. James Dashner announced via Twitter that the production was postponed after the accident.[7] It was said that the producers were "looking to" resume filming around mid-May.[8] According to the Directors Guild of Canada's production list, the film was scheduled to resume filming on May 9, and complete principal photography on July 26. However, on April 29, 2016, production was shut down indefinitely as O'Brien's injuries were more serious than previously thought.[9]
Filming resumed on March 6, 2017 in Cape Town, South Africa.[10][11][12] In May 2017, it was announced that Walton Goggins would play the part of Lawrence, described as "an unusual and dangerous character who is part-revolutionary, part-anarchist, and a voice for the voiceless people."[13] Principal photography wrapped on June 3, 2017.[14]
Release[edit]
It was originally scheduled to be released in the United States on February 17, 2017.[15] However, due to Dylan O'Brien's injuries, the studio said that it was unlikely that this date was going to be met.[9] On May 27, 2016, 20th Century Fox rescheduled the film for January 12, 2018,[16] allowing time for Dylan O'Brien to fully recover.[17]
On April 22, 2017, the studio delayed the release date once again, to February 9, 2018, in order to allow more time for post-production; months later, on August 25, the studio moved the release forward two weeks.[18][19] The film premiered on January 26, 2018 in theatres and IMAX.[20][21]
Home media[edit]
Maze Runner: The Death Cure was released on Blu-Ray and DVD on April 24, 2018.[22]
Reception[edit]
Box office[edit]
Maze Runner: The Death Cure grossed $58 million in the United States and Canada, and $230.1 million in other territories, for a worldwide total of $288.2 million, against a production budget of $62 million.[2]
In the United States and Canada, The Death Cure was released alongside the wide expansion of Hostiles, and was expected to gross around $20 million from 3,786 theaters in its opening weekend.[23] The film made $1.5 million from Thursday night previews, in between the $1.1 million made by the first film and $1.7 million by the second, and $8.4 million on its first day. It ended up opening to $24.2 million, down from the previous film but still finishing atop the box office.[24] In its second weekend the film dropped 57% to $10.5 million, finishing second behind Jumanji: Welcome to the Jungle.[25]
A week prior to its North American release, the film debuted in South Korea, Australia and Taiwan, grossing $15.1 million over its opening weekend.[23] During the first two weeks of international release, the film dominated the international box office taking $62.6 and $35.2 million respectively, and outpacing the two previous films.[26][27]
Critical response[edit]
On review aggregator Rotten Tomatoes, the film has an approval rating of 42% based on 144 reviews, and an average rating of 5.1/10. The website's critical consensus reads, "Maze Runner: The Death Cure may offer closure to fans of the franchise, but for anyone who hasn't already been hooked, this bloated final installment is best left unseen."[28] On Metacritic, the film has a weighted average score of 51 out of 100, based on 37 critics, indicating "mixed or average reviews".[29] Audiences polled by CinemaScore gave the film an average grade of "B+" on an A+ to F scale.[24]
Accolades[edit]
List of awards and nominations
Year
Award
Category
Nominee(s)
Result
2018 Teen Choice Awards[30] Choice Action Movie Maze Runner: The Death Cure Nominated
Choice Action Movie Actor Dylan O'Brien Nominated
Choice Movie Ship Dylan O'Brien & Kaya Scodelario Nominated
Choice Movie Villain Aidan Gillen Nominated
References[edit]
Jump up ^ "MAZE RUNNER: THE DEATH CURE (2018) (12A)". British Board of Film Classification. January 17, 2018. Retrieved January 17, 2018.
^ Jump up to: a b c "Maze Runner: The Death Cure". Box Office Mojo. IMDb. Retrieved July 22, 2018.
Jump up ^ Busch, Anita (March 4, 2015). "'Maze Runner: The Death Cure' Sets T.S. Nowlin To Pen". Deadline Hollywood. Penske Business Media. Retrieved March 10, 2015.
Jump up ^ "The Maze Runner 3 to begin filming in Vancouver in March". Vancity Buzz. January 18, 2016. Retrieved February 8, 2016. [permanent dead link]
Jump up ^ A., Aliza (March 9, 2016). "'The Maze Runner: Death Cure' News And Updates: Filming Confirmed; Release Date Set On February". Jobs & Hire. Retrieved March 12, 2016.
Jump up ^ @ClevverTV (July 9, 2015). "The script for Death Cure is currently being worked on & will begin filming in February #ScorchTrials #ScorchSneakPeek" (Tweet). Retrieved July 10, 2015 – via Twitter.
Jump up ^ Zumberge, Marianne (March 18, 2016). "'Maze Runner' Star Dylan O'Brien Injured on Set". Variety. Penske Business Media. Retrieved March 18, 2016.
Jump up ^ Malkin, Mark (April 5, 2016). "Maze Runner Star Dylan O'Brien Healing Very Well After On-Set Accident, Will Return to Work in About Six Weeks". E!. Retrieved May 1, 2016.
^ Jump up to: a b Ford, Rebecca; Kit, Borys (April 29, 2016). "Dylan O'Brien's Injuries Force 'Maze Runner' Sequel to Extend Production Shut Down". The Hollywood Reporter. Prometheus Global Media. Retrieved May 1, 2016.
Jump up ^ Wilson, Lena (August 29, 2016). "Maze Runner: The Death Cure Resumes Filming In February". Screen Rant. Retrieved August 31, 2016.
Jump up ^ Bailey, Ian (September 4, 2016). "Maze Runner film production leaving B.C. for South Africa". The Globe and Mail. Retrieved September 5, 2016.
Jump up ^ Ball, Wes [@wesball] (March 2, 2017). "Big day today. Shot two scenes in 7 hours (that's a short day for me). Also prelit a set for tomorrow. Then watched dailies... Pretty stuff" (Tweet). Retrieved April 23, 2018 – via Twitter. [non-primary source needed]
Jump up ^ Hipes, Patrick (May 10, 2017). "Walton Goggins Set For 'Maze Runner: The Death Cure'". Deadline Hollywood. Penske Business Media. Retrieved April 23, 2018.
Jump up ^ Ball, Wes [@wesball] (June 4, 2017). "That's a wrap! Thanks to a great cast and crew for a hell of an experience" (Tweet). Retrieved April 23, 2018 – via Twitter. [non-primary source needed]
Jump up ^ Chitwood, Adam (April 18, 2015). "MAZE RUNNER: THE DEATH CURE Set for 2017 Release; Miraculously Not Being Split into Two Movies". Collider. Complex Media. Retrieved June 29, 2015.
Jump up ^ "Maze Runner: The Death Cure". Launching Films. Film Distributors' Association. Retrieved April 1, 2017.
Jump up ^ McNary, Dave (May 28, 2016). "Dylan O'Brien's 'Maze Runner: Death Cure' Release Pushed Back to 2018". Variety. Penske Business Media. Retrieved August 31, 2016.
Jump up ^ Ball, Wes [@wesball] (April 22, 2017). "Hey maze fans. Don't worry. Release date shifted 4 weeks. It's a good thing. I get four more weeks of vfx finals, sound mixing, editing" (Tweet). Retrieved April 23, 2018 – via Twitter. [non-primary source needed]
Jump up ^ Gallagher, Brian (April 24, 2017). "Maze Runner 3: Death Cure Gets Delayed Yet Again". MovieWeb. Watchr Media. Retrieved March 17, 2018.
Jump up ^ Anthony, D'Allessandro (April 22, 2017). "'Deadpool 2', 'New Mutants' & 'Dark Phoenix' Find 2018 Dates Among Fox's Slew of Release Changes & Additions". Deadline Hollywood. Penske Business Media. Retrieved April 23, 2017.
Jump up ^ Dave, McNary (August 25, 2017). "Steven Spielberg's Pentagon Papers Movie Re-Titled 'The Post'". Variety. Penske Business Media. Retrieved August 26, 2017.
Jump up ^ "Maze Runner: The Death Cure (DVD)". Amazon. Retrieved March 15, 2018.
^ Jump up to: a b McNary, Dave (January 23, 2018). "Box Office: 'Maze Runner: The Death Cure' Races Toward $20 Million Opening". Variety. Retrieved January 23, 2018.
^ Jump up to: a b D'Alessandro, Anthony (January 28, 2018). "Fox Controls Close To 40% Of Weekend B.O. Led By 'Maze Runner' & Oscar Holdovers; 'Hostiles' Gallops Past $10M". Deadline Hollywood. Penske Business Media. Retrieved January 28, 2018.
Jump up ^ D'Alessandro, Anthony (February 4, 2018). "'Jumanji' Poised To Be Dwayne Johnson's Highest Grossing Pic of All-Time Stateside After Super Bowl Weekend Rebound". Deadline Hollywood. Penske Business Media. Retrieved February 4, 2018.
Jump up ^ McNary, Dave (January 28, 2018). "Box Office: 'Maze Runner: The Death Cure' Dominates With $62.6 Million Internationally". Variety. Penske Business Media. Retrieved February 5, 2018.
Jump up ^ McNary, Dave (February 4, 2018). "'Maze Runner: The Death Cure' Sprints to $35 Million at International Box Office". Variety. Penske Business Media. Retrieved February 5, 2018.
Jump up ^ "Maze Runner: The Death Cure (2018)". Rotten Tomatoes. Fandango Media. Retrieved April 23, 2018.
Jump up ^ "Maze Runner: The Death Cure Reviews". Metacritic. CBS Interactive. Retrieved January 28, 2018.
Jump up ^ "Teen Choice Awards 2018: See the full list of winners". EW.com. Entertainment Weekly. Retrieved August 13, 2018.
External links[edit]
Official website
Maze Runner: The Death Cure on IMDb
show
v
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e
The Maze Runner series by James Dashner
Main trilogy
The Maze Runner
The Scorch Trials
The Death Cure
Prequels
The Kill Order
The Fever Code
Film series
The Maze Runner
Maze Runner: The Scorch Trials
Maze Runner: The Death Cure
show
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e
Films directed by Wes Ball
The Maze Runner (2014)
Maze Runner: The Scorch Trials (2015)
Maze Runner: The Death Cure (2018)
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