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The triple-helical conformation, which is a characteristic feature of all fibrillar collagens, is possible because of the presence of glycine as every third amino acid in the sequence of about 1000 amino acids. When the right-handed super-helix is formed, the glycine residues of each of the monomers are positioned at the center of the super ...
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 unusual derivative amino acids not directly inserted during translation. These amino acids are found at specific locations relative to glycine and are modified post ...
The collagen triple helix is made of three collagen peptides, each of which forms its own left-handed polyproline helix. [5] When the three chains combine, the triple helix adopts a right-handed orientation. The collagen peptide is composed of repeats of Gly-X-Y, with the second residue (X) usually being Pro and the third (Y) being ...
In 1954, Ramachandran & Kartha (13, 14) advanced a structure for the collagen triple helix on the basis of fiber diffraction data. It consists of a triple helix made of the repetitious amino acid sequence glycine-X-Y, where X and Y are frequently proline or hydroxyproline. [2] [3] Collagen folded into a triple helix is known as tropocollagen.
Collagen alpha-3(VI) chain is a protein that in humans is encoded by the COL6A3 gene. [ 5 ] [ 6 ] [ 7 ] This protein is an alpha chain of type VI collagen that aids in microfibril formation. [ 8 ] As part of type VI collagen, this protein has been implicated in Bethlem myopathy, Ullrich congenital muscular dystrophy (UCMD), and other diseases ...
The chain length of α3(VI) is roughly a third larger than those of α1(VI) and α2(VI), and it consists of several spliced variants within the range of 2,500 to 3,100 amino acids. [5] The first two alpha chains subunits of ColVI have a molecular weight of 140-150 KDa and the third polypeptide chain is larger with a molecular weight of 250 ...