A thyrotropin-releasing hormone analogue: pGlu-Phe-D-Pro-psi [CN4]-NMe at 293 and 107 K.

P. L. Howell, W. A. Pangborn, G. R. Marshall, J. Zabrocki, G. D. Smith

Research output: Contribution to journalArticle

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Abstract

Data have been measured at two temperatures, 293 K and 107 K, for a crystal of a thyrotropin-releasing hormone analogue, pGlu-Phe-D-Pro-psi [CN4]-NMe, C20H25N7O3, and the structures solved and refined. The tripeptide contains a tetrazole ring which mimics a cis-peptide bond at the C terminus. An intermolecular hydrogen bond exists between two molecules related by the twofold screw axis, resulting in infinite chains of hydrogen-bonded peptide molecules. Because of the folding and packing of the molecules, there are no intermolecular contacts of less than 4 A to the N atom of the phenylalanine residue.

Original languageEnglish
Pages (from-to)2575-2579
Number of pages5
JournalActa crystallographica. Section C, Crystal structure communications
Volume51 ( Pt 12)
DOIs
StatePublished - Dec 15 1995
Externally publishedYes

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