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Conformational preferences of heterochiral peptides. Crystal structures of heterochiral peptides Boc-(D) Val-(D) Ala-Leu-Ala-OMe and Boc-Val-Ala-Leu-(D) Ala-OMe- enhanced stability of beta-sheet through C-H - O hydrogen bonds

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Title Conformational preferences of heterochiral peptides. Crystal structures of heterochiral peptides Boc-(D) Val-(D) Ala-Leu-Ala-OMe and Boc-Val-Ala-Leu-(D) Ala-OMe- enhanced stability of beta-sheet through C-H - O hydrogen bonds
 
Creator FABIOLA, GF
BOBDE, V
DAMODHARAN, L
PATTABHI, V
DURANI, S
 
Subject methoxide
proteins
solvate
 
Description The crystal structures of Boc-(D) Val-(D) Ala-Leu-Ala-OMe (vaLA) and Boc-Val-Ala-Leu-(D) Ala-OMe (VALa) have been derermined. vaLA crystallises in space group P2(1)2(1)2(1) with a = 9.401 (4), b = 17.253 (5). c = 36.276 (9)Angstrom, V = 5884 (3) Angstrom (3), Z = 8, R = 0.086. VALa crystallises in space group p2(1)2(1)2(1) with a = 9.683 (9), b = 17.355 (7), c = 18.187 (9) Angstrom, beta = 95.84 (8)degrees, V = 3040(4) Angstrom (3), Z = 4. R = 0.125. There are two molecules in the asymmetric unit in antiparallel P-sheet arrangement in both the structures. Several of the Ca hydrogens are in hydrogen bonding contact with the carbonyl oxygen in the adjacent strand. An analysis of the observed conformational feature of D-chiral amino acid residues in oligopeptides. using coordinates of 123 crystal structures selected from the 1998 release of CSD has been carried out. This shows that all the residues except D-isoleucine prefer both extended and a, conformation though the frequence of occurence may not be equal. In addition to this, D-leucine, valine, proline and phenylalanine have assumed cc, conformations in solid slate. D-leucine has a strong preference for helical conformation in linear peptides whereas they prefer an extended conformation in cyclic peptides.
 
Publisher ADENINE PRESS INC
 
Date 2011-07-12T20:31:09Z
2011-12-26T12:47:48Z
2011-12-27T05:40:14Z
2011-07-12T20:31:09Z
2011-12-26T12:47:48Z
2011-12-27T05:40:14Z
2001
 
Type Article
 
Identifier JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS, 18(4), 579-594
0739-1102
http://dspace.library.iitb.ac.in/xmlui/handle/10054/3606
http://hdl.handle.net/10054/3606
 
Language en