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Stereochemical studies on cyclic peptides. Part XI. Conformation of cyclic pentapeptides having intramolecular 3 leads to 1 hydrogen bonds.

Ramakrishnan, C and Rao, BN (1980) Stereochemical studies on cyclic peptides. Part XI. Conformation of cyclic pentapeptides having intramolecular 3 leads to 1 hydrogen bonds. In: International Journal of Peptide & Protein Research, 15 (2). pp. 81-95.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1399-...

Abstract

Conformational analysis of cyclic pentapeptides having two intra-ring 3 leads to 1 hydrogen bonds has been carried out. It is found that the structure can easily be formed with trans planar peptide units without causing significant angular strain at the alpha-carbon atoms. Four different types of conformations designated Types I--IV are possible for the backbone structure. Details of these four types of conformations and also the accommodating possibility of these types for allglycyl and all-alanyl residues are presented. Three of the four types have relatively low energies for glycyl residues whereas the other one has a slightly higher energy. When alanyl residues are introduced at the five alpha-carbon atoms, the types that are energetically favourable depend upon the sequence of isomers. Energy calculations have also been carried out for the combinations of glycyl, L- and D-alanyl residues. The theoretical results are compared with available experimental observations both from solution and solid state studies.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to John Wiley and Sons.
Keywords: conformation;cyclic pentapeptide;3 1 hydrogen bond (in cyclic pentapeptide); pentapeptide-cyclic;ring closure in cyclic pentapeptide; * stereochemistry
Department/Centre: Division of Biological Sciences > Molecular Biophysics Unit
Date Deposited: 10 Jan 2011 06:03
Last Modified: 10 Jan 2011 06:03
URI: http://eprints.iisc.ernet.in/id/eprint/34691

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