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  • Title: C-H...O hydrogen bonds in beta-sheets.
    Author: Fabiola GF, Krishnaswamy S, Nagarajan V, Pattabhi V.
    Journal: Acta Crystallogr D Biol Crystallogr; 1997 May 01; 53(Pt 3):316-20. PubMed ID: 15299935.
    Abstract:
    A detailed analysis of the occurrence of the C-H...O hydrogen bonds in sheet regions of proteins has been presented. 11 unique protein structures with resolution 1.3 A containing beta-sheets show a widespread presence of C-H...O hydrogen bonds. These have average C(alpha).O, CH...O distances and a C(alpha)-H...O angle of 3.29, 2.38 A and 143 degrees, respectively. As in the case of N-H...O hydrogen bonds, parallel and antiparallel beta-sheet regions show the same hydrogen-bond geometry. An inverse correlation is observed between the hydrogen-bond geometries involving the C(alpha)(i)-H...O=C and the N(i+1)-H...O=C suggesting that C-H...O hydrogen bonds may act as an additional stabilizing factor. The propensity of different amino-acid residues to form such hydrogen bonds varies and shows a clear preference for valine and threonine. C-H...O hydrogen bonds involving side chains also occur extensively in beta-sheet regions.
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