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Crystal Structure and Molecular Conformation of the Cyclic Hexapeptide cyclo-(Gly-Aib-Gly)2

✍ Scribed by Encarnacion Escudero; Xavier Vidal; Xavier Solans; Evaristo Peggion; Juan Antonio Subirana

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
496 KB
Volume
2
Category
Article
ISSN
1075-2617

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✦ Synopsis

Abstract

We have synthesized and crystallized the cyclic peptide (Gly‐Aib‐Gly) ~2~. Its structure has been determined by conventional X‐ray diffracti on methods. In the crystal it adopts a conformation with one β‐turn (type I) and its mirror image at the other side of the ring. All conformation al angles are similar to those reported for these amino acid residues. In particular the Aib residue has a conformation intermediate between α‐ and 3~10~‐helical conformations. The ring is an adequate model for the β‐turn conformation. A molecule of formic acid is found in the crystal which shows a very short hydrogen bond with one of the glycine carbonyl groups.

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