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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. [24] Proline or hydroxyproline constitute about 1/6 of the total sequence.
Hydroxyproline and proline play key roles for collagen stability. [4] They permit the sharp twisting of the collagen helix. [5] In the canonical collagen Xaa-Yaa-Gly triad (where Xaa and Yaa are any amino acid), a proline occupying the Yaa position is hydroxylated to give a Xaa-Hyp-Gly sequence.
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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 ...
This mutation substitutes the amino acid cysteine for the amino acid arginine at position 134 in the protein made by the gene. (The mutation can also be written as Arg134Cys.) The altered protein interacts abnormally with other collagen-building proteins, disrupting the structure of type I collagen fibrils and trapping collagen in the cell.