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Crystal structure of L-lysyl-L-glutamic acid dihydrate

Hemant, Yennawar P and Viswamitra, MA (1989) Crystal structure of L-lysyl-L-glutamic acid dihydrate. In: International Journal of Peptide & Protein Research, 34 (1). pp. 42-45.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1399-...


L-Lysyl-L-glutamic acid dihydrate, C11N3O5H21·2H2O, crystallizes in the monoclinic space group P21 with a = 12.474(2), b = 5.020(1), c = 13.157(2) Å, β= 114.69(1)° and Z = 2. The crystal structure was solved by direct methods and refined to an R value of 0.037 using full matrix least-squares method. The molecule exists as a double zwitterion with both the amino and carboxyl groups ionised. The peptide has a folded conformation with its Lys residue trans and Glu residue gauche−gauche+. The side chains of the Lys and Glu residues correspond to all trans and folded (g−g−g−) conformations respectively. The terminal carboxyl group forms hydrogen bonds with the ξ-amino group of the lysine side chain. The head-to-tail interaction often seen in peptide crystals is absent in the present structure. In the extended crystal structure water molecules form channels along the b direction and are enclosed within helically arranged hydrogen bonds formed by the lysine side chain and the peptide backbone.

Item Type: Journal Article
Publication: International Journal of Peptide & Protein Research
Publisher: John Wiley and Sons
Additional Information: Copyright of this article belongs to John Wiley and Sons.
Keywords: L-Lys-L-Glu;peptide aggregation;peptide conformation;X-ray crystal structure.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Division of Biological Sciences > Microbiology & Cell Biology
Date Deposited: 13 Aug 2010 09:32
Last Modified: 13 Aug 2010 09:32
URI: http://eprints.iisc.ac.in/id/eprint/31266

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