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Issue 10, 1993
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Conformational analysis by molecular mechanics energy minimizations of the tetrapeptide Boc-Gly-Leu-Gly-Gly–NMe, a recurring sequence of elastin

Abstract

The amino acid sequences Gly-X-Gly-Gly (X = Ala, Val, Leu, lle) frequently recur in elastin and might play a role in the molecular mechanism of protein elasticity. In this paper we report on a theoretical conformational analysis by molecular mechanics energy minimizations of the tetrapeptide Boc-Gly-Leu-Gly-Gly–NMe, using a strategy based on the build-up method for searching exhaustively the conformational space. The set of 3785 conformers has been determined and a statistical analysis has been carried out. The conformers' energy, end-to-end distance, torsions and [double bond splayed left]C[double bond, length half m-dash]O ⋯ HN[double bond splayed right] interaction distance distributions are discussed. The stability of type II β-turn Gly-1-C[double bond, length half m-dash]O ⋯ HNGIy-4, within the conformer family (experimentally observed), and C7 HNLeu-2, C7 HNMe and C10 HNMe hydrogen bonds (hypothesized according to experimental results), have been theoretically verified. The possible role of librational motions and sliding β-turns for the entropic elasticity mechanism of elastin is discussed.

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Article information


J. Chem. Soc., Perkin Trans. 2, 1993, 1951-1961
Article type
Paper

Conformational analysis by molecular mechanics energy minimizations of the tetrapeptide Boc-Gly-Leu-Gly-Gly–NMe, a recurring sequence of elastin

V. Villani and A. M. Tamburro, J. Chem. Soc., Perkin Trans. 2, 1993, 1951
DOI: 10.1039/P29930001951

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