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Position effect of cross-strand side-chain interactions on β-hairpin formation

Published online by Cambridge University Press:  15 December 2000

CLARA M. SANTIVERI ,
MANUEL RICO  and
M. ANGELES JIMÉNEZ
CLARA M. SANTIVERI
Affiliation:
Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Científicas, Serrano 119, 28006-Madrid, Spain
MANUEL RICO
Affiliation:
Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Científicas, Serrano 119, 28006-Madrid, Spain
M. ANGELES JIMÉNEZ
Affiliation:
Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Científicas, Serrano 119, 28006-Madrid, Spain
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Abstract

Previous conformational analysis of 10-residue linear peptides enabled us to identify some cross-strand side-chain interactions that stabilize β-hairpin conformations. The stabilizing influence of these interactions appeared to be greatly reduced when the interaction was located at the N- and C-termini of these 10-residue peptides. To investigate the effect of the position relative to the turn of favorable interactions on β-hairpin formation, we have designed two 15-residue β-hairpin forming peptides with the same residue composition and differing only in the location of two residues within the strand region. The conformational properties of these two peptides in aqueous solution were studied by 1H and 13C NMR. Differences in the conformational behavior of the two designed 15-residue peptides suggest that the influence of stabilizing factors for β-hairpin formation, in particular, cross-strand side-chain interactions, depends on their proximity to the turn. Residues adjacent to the turn are most efficient in that concern. This result agrees with the proposal that the turn region acts as the driving force in β-hairpin folding.

Keywords

β-hairpinβ-turnNMRpeptide designprotein foldingside-chain interactions
Type
Research Article
Information
Protein Science , Volume 9 , Issue 11 , November 2000 , pp. 2151 - 2160
Copyright
2000 The Protein Society

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