beta gamma-fused turn structures in sugar amino acid (SAA) containing cyclic tetrapeptides with alpha 3 delta architecture

Singh, Gajendra and Ghosh, Uttam and Pal, Sudip and Ampapathi, Ravi Sankar and Chakraborty, Tushar Kanti (2014) beta gamma-fused turn structures in sugar amino acid (SAA) containing cyclic tetrapeptides with alpha 3 delta architecture. In: TETRAHEDRON, 70 (42). pp. 7681-7685.

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Abstract

The current manuscript describes conformational analysis of 15-membered cyclic tetrapeptides (CTPs), with alpha 3 delta architecture, containing sugar amino acids (SAA) having variation in the stereocenter at C5 carbon. Conformational analyses of both the series, in protected and deprotected forms, were carried out in DMSO-d(6) using various NMR techniques, supported by restrained MD calculations. It was intriguing to notice that the alpha 3 delta macrocycles got stabilized by both 10-membered beta-turn as well as a seven-membered gamma-turn, fused within the same macrocycle. The presence of fused sub-structures within a 15-membered macrocycle is rare to see. Also, the stereocenter variation at C5 did not affect the fused turn structures and exhibited similar conformations in both the series. The design becomes highly advantageous as fused reverse turn structures are occurring in the cyclic structure with minimalistic size macrocycle and this can be applied to develop suitable pharmacophores in the drug development process. (C) 2014 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	TETRAHEDRON
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copyright for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND.
Keywords:	Macrocycles; Peptidomimetics; beta gamma-fused turns; Conformational study; Molecular dynamics
Department/Centre:	Division of Chemical Sciences > Organic Chemistry
Date Deposited:	08 Nov 2014 05:24
Last Modified:	08 Nov 2014 05:24
URI:	http://eprints.iisc.ac.in/id/eprint/50193

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