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• W2080110040 abstract "Collagenolysis plays a central role in many disease processes and a detailed understanding of the mechanism of collagen degradation is of immense interest. While a considerable body of information about collagenolysis exists, the details of the underlying molecular mechanism are unclear. Therefore, to further our understanding of the precise mechanism of collagen degradation, we used molecular dynamics simulations to explore the structure of human type I collagen in the vicinity of the collagenase cleavage site. Since post-translational proline hydroxylation is an important step in the synthesis of collagen chains, we used the DNA sequence for the α1 and α2 chains of human type I collagen, and the known amino acid sequences for bovine and chicken type I collagen, to infer which prolines are hydroxylated in the vicinity of the collagenase cleavage site. Simulations of type I collagen in this region suggest that partial unfolding of the α2 chain is energetically preferred relative to unfolding of α1 chains. Localized unfolding of the α2 chain leads to the formation of a structure that has disrupted hydrogen bonds N-terminal to the collagenase cleavage site. Our data suggest that this disruption in hydrogen bonding pattern leads to increased chain flexibility, thereby enabling the α2 chain to sample different partially unfolded states. Surprisingly, our data also imply that α2 chain unfolding is mediated by the non-hydroxylation of a proline residue that is N-terminal to the cleavage site in α1 chains. These results suggest that hydroxylation on one chain (α1) can affect the structure of another chain (α2), and point to a critical role for the non-hydroxylation of proline residues near the collagenase cleavage site." @default.
• W2080110040 created "2016-06-24" @default.
• W2080110040 creator A5024941370 @default.
• W2080110040 creator A5050181363 @default.
• W2080110040 date "2008-09-01" @default.
• W2080110040 modified "2023-10-18" @default.
• W2080110040 title "Differential Unfolding of α1 and α2 Chains in Type I Collagen and Collagenolysis" @default.
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• W2080110040 doi "https://doi.org/10.1016/j.jmb.2008.07.009" @default.
• W2080110040 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18644377" @default.
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