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Stereochemical restrictions on the occurrence of amino acid residues in the collagen structure

Bansal, M (1977) Stereochemical restrictions on the occurrence of amino acid residues in the collagen structure. In: International Journal of Peptide and Protein Research, 9 (3). pp. 224-234.

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The primary structure of collagen is characterized by the repeating tripeptide sequence (Gly-R2-R3)n. The results of theoretical studies, carried out using contact criteria to compute the stereochemically allowed orientations for various side chains at locations 2 and 3, are reported here. It is found that side chains with only γ-atoms, as in valine, serine and threonine, or with only one δ-methyl group, as in isoleucine, can occur equally well at locations 2 and 3, as is actually the case in collagen. Side chains with two Cδ-atoms, as in leucine and phenyl-alanine, can also be accommodated at both positions. However, if they occur as R3 their freedom of orientation is severely restricted in the presence of a proline residue as R2 in a neighbouring chain. If water molecules bound to the chains of the triple helix are assumed to be present, then location 3 is virtually impossible for leucine and phenylalanine residues. Location 2 is, however, unaffected, and their presence as R2 can help to shield the water molecules from disturbance by the solvent medium. This may be the reason for the preferential occurrence of Leu and Phe residues in location 2 in the collagen triplets, although the polypeptides (Gly-Pro-Leu)n and (Gly-Pro-Phe)n form collagen-like structures.

Item Type: Journal Article
Publication: International Journal of Peptide and Protein Research
Publisher: Wiley Interscience
Additional Information: Copyright of this article belongs to Wiley Interscience.
Department/Centre: Division of Biological Sciences > Molecular Biophysics Unit
Date Deposited: 28 Jan 2010 10:55
Last Modified: 28 Jan 2010 10:55
URI: http://eprints.iisc.ac.in/id/eprint/24637

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