The molecular and crystal structures of two N alpha-protected tripeptide amides, containing in the central position the alpha-beta-dehydro-amino acid residue delta Phe (Z-configurational isomer), were determined by X-ray diffraction. While Z-Gly-delta Phez-L-Pro-NH2 is characterized in the crystal state by the presence of a type I beta-bend conformation (at the delta Phez-L-Pro sequence), Z-D-Ala-delta Phez-Gly-NH2 is folded into two consecutive beta-bends (type II' followed by type I), at the D-Ala-delta Phez and delta Phez-Gly sequences, respectively. In both cases the achiral delta Phez residue adopts a set of phi, psi angles typical of the right-handed helical conformation. The delta Phe residue may be exploited to design aromatic peptides with preferred secondary structures.

Linear oligopeptides. 252. alpha,beta-dehydro-amino acid residues in the design of peptide structures - molecular and crystal-stuctures of 2 folded dehydro peptides

BALBONI, GIANFRANCO
1992

Abstract

The molecular and crystal structures of two N alpha-protected tripeptide amides, containing in the central position the alpha-beta-dehydro-amino acid residue delta Phe (Z-configurational isomer), were determined by X-ray diffraction. While Z-Gly-delta Phez-L-Pro-NH2 is characterized in the crystal state by the presence of a type I beta-bend conformation (at the delta Phez-L-Pro sequence), Z-D-Ala-delta Phez-Gly-NH2 is folded into two consecutive beta-bends (type II' followed by type I), at the D-Ala-delta Phez and delta Phez-Gly sequences, respectively. In both cases the achiral delta Phez residue adopts a set of phi, psi angles typical of the right-handed helical conformation. The delta Phe residue may be exploited to design aromatic peptides with preferred secondary structures.
BETA-BENDS; ALPHA,BETA-DEHYDRO-PEPTIDES; ALPHA,BETA-DEHYDRO-PHENYLALANINE; PEPTIDES; X-RAY DIFFRACTION
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11584/6852
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