Thermodynamic characterizations of an intramolecularly hydrogen bonded C5-structure across proteinogenic residue.

Ganguly, Ashish and Kishore, Raghuvansh (1997) Thermodynamic characterizations of an intramolecularly hydrogen bonded C5-structure across proteinogenic residue. FEBS letters, 417 (1). pp. 97-100. ISSN 0014-5793

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Abstract

Thermodynamic investigations of a smallest possible intramolecularly hydrogen bonded C5-structure, across a Thr residue, in model peptides Boc-Xxx-Thr-NH2 (Xxx = Ile, 1 or Leu, 2), indicated unusual thermal stability of the structure in non-polar medium. An analysis of van't Hoff plots, constructed from variable temperature 1H NMR data, yielded the thermodynamic parameters of a hydrogen bonded five-membered ring. The non-significance of the spatial organizations of the preceding CdeltaH3 bearing hydrophobic proteinogenic residue on the thermal stability of the C5-structure has been observed. The results revealed that the contribution of this element of secondary structure is quantifiable and the stability appeared to be roughly comparable to other intramolecularly hydrogen bonded reverse turn structures frequently observed in polypeptides and proteins.

Item Type:	Article
Additional Information:	Copyright of this article belongs to Elsevier Science
Uncontrolled Keywords:	C5-structure; NMR, 1H- spectroscopy; van't Hoff analysis; β- and γ-turn secondary structure
Subjects:	Q Science > QR Microbiology
Depositing User:	Dr. K.P.S.Sengar
Date Deposited:	02 Jan 2012 17:29
Last Modified:	22 Jul 2015 03:59
URI:	http://crdd.osdd.net/open/id/eprint/366

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