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Crystal Structure and Molecular Conformation of the Cyclic Hexapeptide cyclo ‐(Gly‐Aib‐Gly) 2
Author(s) -
Escudero Encarnacion,
Vidal Xavier,
Solans Xavier,
Peggion Evaristo,
Subirana Juan Antonio
Publication year - 1996
Publication title -
journal of peptide science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 66
eISSN - 1099-1387
pISSN - 1075-2617
DOI - 10.1002/psc.48
Subject(s) - cyclic peptide , stereochemistry , chemistry , crystal structure , crystallography , peptide , biochemistry
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.