Revision of collagen molecular structure

Based on the fiber diffraction data from native collagen, Rich and Crick proposed the 10/3‐helical model with a 28.6 Å axial repeat in 1955 (Rich A.; Crick, F. H. C. Nature (Lond) 1955, 176, 915–916). We obtained the 7/2‐helical structure with a 20 Å axial repeat from the single crystal analysis of...

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Bibliographic Details
Published in:Biopolymers 2006, Vol.84 (2), p.181-191
Main Authors: Okuyama, Kenji, Xu, Xiaozhen, Iguchi, Makoto, Noguchi, Keiichi
Format: Article
Language:English
Subjects:
Animals
collagen
Collagen - chemistry
Collagen - isolation & purification
fiber diffraction
Hydrogen Bonding
Macropodidae
Models, Molecular
molecular structure
Peptides - chemistry
Protein Conformation
Protein Structure, Secondary
Tendons - chemistry
triple helix
Water - chemistry
X-Ray Diffraction
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Summary:Based on the fiber diffraction data from native collagen, Rich and Crick proposed the 10/3‐helical model with a 28.6 Å axial repeat in 1955 (Rich A.; Crick, F. H. C. Nature (Lond) 1955, 176, 915–916). We obtained the 7/2‐helical structure with a 20 Å axial repeat from the single crystal analysis of (Pro–Pro–Gly)10. Since the latter structure could explain fiber diffraction patterns from native collagen, we proposed this structure as a new model for collagen in 1977 (Okuyama et al., Polym J 1977, 9, 341–343). These two structural models were refined against observed continuous intensity data from native collagen using a linked‐atom least‐squares method. It was found that the diffraction data from native collagen could be explained by the 7/2‐helical model better than, or at least the same as, the prevailing 10/3‐helical model. Together with the evidence that recent single crystal analyses of many model peptides have supported the 7/2‐helical model and there was no such active support for the 10/3‐helical model, it was concluded that the average molecular structure of native collagen seems to be closer to the 7/2‐helical symmetry than the other one. © 2005 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 84: 181–191, 2006 This article was originally published online as an accepted preprint. The “Published Online” date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com
ISSN:0006-3525
1097-0282
DOI:10.1002/bip.20381