Acta Cryst. (2007). E63, o19-o21  [ doi:10.1107/S1600536806049841 ]

N-[tert-Butoxycarbonylglycyl-(E)-,-dehydrophenylalanylglycylglycyl-(E)-,-dehydrophenylalanyl]glycine

M. Makowski, M. Lisowski, I. Mikolajczyk and T. Lis

Abstract: In the molecule of the title hexapeptide, Boc⁰-Gly¹-^EPhe²-Gly³-Gly⁴-^EPhe⁵-Gly⁶-OH, C₃₁H₃₆N₆O₉, there are two overlapping -turns, one of type II on the ^EPhe² (^EPhe is isomer E of the ,-dehydrophenylalanine residue) and Gly³ residues and the second of type III' on the Gly³ and Gly⁴ residues. All amino acids in the peptide are linked trans to each other. Three relatively strong intramolecular N-HO hydrogen bonds stabilize the crystal structure. Two of them, of the 41 type, are responsible for two -turns in the peptide.

Online 6 December 2006

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