CRYSTAL STRUCTURE AND CONFORMATION OF CYCLO‐L‐CYSTINE
- 1 July 1981
- journal article
- research article
- Published by Wiley in International Journal of Peptide and Protein Research
- Vol. 18 (1) , 88-102
- https://doi.org/10.1111/j.1399-3011.1981.tb02043.x
Abstract
X‐ray crystallographic investigations on cyclo‐l‐cystine show that the diketo‐piperazine ring is in a twisted boat form and the C‐S‐S‐C bridge across the Cα atoms has a negative chirality with χ3 angle of — 94°. The two peptides are significantly nonplanar with the ω values of — 10° and — 16°. The crystals are orthorhombic, space group P212121 with a = 11.216(4), b = 12.874(4), c = 5.978(3) and Z = 4. The structure was solved by heavy atom method and refined to an R index of 0.065.Keywords
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