Lipid Induced Conformation of the Tachykinin Peptide Kassinin

Rani, Christy R and Lynn, Andrew M and Cowsik, Sudha M (2001) Lipid Induced Conformation of the Tachykinin Peptide Kassinin. In: Journal of Biomolecular Structure and Dynamics, 18 (4). pp. 611-625.

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Abstract

Both the aqueous and lipid-induced structure of Kassinin, a dodecapeptide of amphibian origin, has been studied by two-dimensional proton nuclear magnetic resonance (2D 1H-NMR) spectroscopy and distance geometry calculations. Unambiguous NMR assignments of protons have been made with the aid of correlation spectroscopy (DQF-COSY and TOCSY) experiments and nuclear Overhauser effect spectroscopy (NOESY and ROESY) experiments. The distance constraints obtained from the NMR data have been utilized in a distance geometry algorithm to generate a family of structures, which have been refined using restrained energy minimization and dynamics. These data show that, while in water Kassinin prefers to be in an extended chain conformation, in the presence of perdeuterated dodecylphosphocholine (DPC) micelles, a membrane model system, helical conformation is induced in the central core and C-terminal region (K4-M12) of the peptide. N-terminus though less defined also displays some degree of order and a possible turn structure. The conformation adopted by Kassinin in the presence of DPC micelles is consistent with the structural motif typical of neurokinin-1 selective agonists and with that reported for Eledoisin in hydrophobic environment.

Item Type:	Journal Article
Publication:	Journal of Biomolecular Structure and Dynamics
Publisher:	Adeninepress
Additional Information:	Copyright of this article belongs to Adeninepress.
Keywords:	Biochemistry;Molecular Biophysics
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	11 Oct 2007
Last Modified:	07 Feb 2012 07:04
URI:	http://eprints.iisc.ac.in/id/eprint/12221

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