Crystal structure and conformation of cyclo-L-cystine

Varughese, K. I. ; Lu, C. T. ; Kartha, G. (1981) Crystal structure and conformation of cyclo-L-cystine International Journal of Peptide and Protein Research, 18 (1). pp. 88-102. ISSN 0367-8377

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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 X3 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.

Item Type:Article
Source:Copyright of this article belongs to Munksgaard International Publishers.
Keywords:Chirality; Cyclic Dipeptide; Cyclo-Cystine; Diketopiperazine; Disulfide Bridge
ID Code:28708
Deposited On:15 Dec 2010 11:41
Last Modified:04 Jun 2011 09:01

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