Proline provides site-specific flexibility for in vivo collagen.

Proline provides site-specific flexibility for in vivo collagen.
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DOI:
10.1038/s41598-018-31937-x
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发表时间:
2018-09-14
期刊:
影响因子:
4.6
通讯作者:
Duer MJ
Duer MJ
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Chow WY;Forman CJ;Bihan D;Puszkarska AM;Rajan R;Reid DG;Slatter DA;Colwell LJ;Wales DJ;Farndale RW;Duer MJ

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Fibrillar collagens have mechanical and biological roles, providing tissues with both tensile strength and cell binding sites which allow molecular interactions with cell-surface receptors such as integrins. A key question is: how do collagens allow tissue flexibility whilst maintaining well-defined ligand binding sites? Here we show that proline residues in collagen glycine-proline-hydroxyproline (Gly-Pro-Hyp) triplets provide local conformational flexibility, which in turn confers well-defined, low energy molecular compression-extension and bending, by employing two-dimensional 13C-13C correlation NMR spectroscopy on 13C-labelled intact ex vivo bone and in vitro osteoblast extracellular matrix. We also find that the positions of Gly-Pro-Hyp triplets are highly conserved between animal species, and are spatially clustered in the currently-accepted model of molecular ordering in collagen type I fibrils. We propose that the Gly-Pro-Hyp triplets in fibrillar collagens provide fibril “expansion joints” to maintain molecular ordering within the fibril, thereby preserving the structural integrity of ligand binding sites.
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