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Design and Construction of an Open Multistranded ‚beta-Sheet Polypeptide Stabilized by a Disulfide Bridge

Venkatraman, Janani and Gowda, Nagana GA and Balaram, Padmanabhan (2002) Design and Construction of an Open Multistranded ‚beta-Sheet Polypeptide Stabilized by a Disulfide Bridge. In: Journal of the American Chemical Society, 124 (18). pp. 4987-4994.

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Abstract

The design and characterization of an open eight- stranded ‚beta-sheet in a synthetic, 2- fold symmetric 70-residue peptide is described. The design strategy involves the generation of a 35-residue four-stranded ‚beta-sheet peptide in which successive hairpins are nucleated by appropriately positioned Pro-Xxx sequences. Oxidative dimerization using a single Cys residue positioned at the center of the C-terminal strand results in a disulfide-bridged eight-stranded structure. Nuclear Overhauser effects firmly establish an eight-stranded ‚beta-sheet in methanol. In water, the outer strands are frayed, but a well- defined four-stranded ‚beta-sheet stabilized by a disulfide bridge and a hydrophobic cluster is determined from NMR data. Comparison of the precursor peptide with the disulfide-bridged dimer reveals considerable enhancement of ‚beta-sheet content in the latter, suggesting that the disulfide cross-link is an effective strategy for the stabilization of ‚beta-sheets.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to American Chemical Society
Department/Centre: Division of Biological Sciences > Molecular Biophysics Unit
Division of Chemical Sciences > Sophisticated Instruments Facility
Date Deposited: 28 Aug 2004
Last Modified: 19 Sep 2010 04:14
URI: http://eprints.iisc.ernet.in/id/eprint/1295

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