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Crystal structure of the collagen triple helix model [(Pro-Pro-Gly)10]3

By Rita Berisio, Luigi Vitagliano, Lelio Mazzarella and Adriana Zagari


The first report of the full-length structure of the collagen-like polypeptide [(Pro-Pro-Gly)10]3 is given. This structure was obtained from crystals grown in a microgravity environment, which diffracted up to 1.3 Å, using synchrotron radiation. The final model, which was refined to an Rfactor of 0.18, is the highest-resolution description of a collagen triple helix reported to date. This structure provides clues regarding a series of aspects related to collagen triple helix structure and assembly. The strict dependence of proline puckering on the position inside the Pro-Pro-Gly triplets and the correlation between backbone and side chain dihedral angles support the propensity-based mechanism of triple helix stabilization/destabilization induced by hydroxyproline. Furthermore, the analysis of [(Pro-Pro-Gly)10]3 packing, which is governed by electrostatic interactions, suggests that charges may act as locking features in the axial organization of triple helices in the collagen fibrils

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Publisher: Cold Spring Harbor Laboratory Press
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Provided by: PubMed Central
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