Thermodynamics of lectin-sugar interaction: Binding of sugars to winged bean (Psophocarpus tetragonolobus) basic agglutinin (WBAI)

Puri, Kamal Deep and Surolia, Avadhesha (1994) Thermodynamics of lectin-sugar interaction: Binding of sugars to winged bean (Psophocarpus tetragonolobus) basic agglutinin (WBAI). In: International Conference on Thermodynamics of Solutions and Biological Systems, JAN 03-06, 1993, NEW DELHI, INDIA.

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Abstract

Combining site of WBAI is extended and encompasses all the residues of blood group A-reactive trisaccharide [GalNAcalpha3Galbeta4Glc]. Though both of the fucose residues of A-pentasaccharide [GalNAcalpha(Fucalpha2)3Galbeta(Fucalpha3)4Glc] do not directly interact, with the combining site they thermodynamically favour the interaction of GalNAcalpha3Galbeta4Glc part of the molecule by imposing a sterically favourable orientation of the binding epitope viz. GalNAcalpha3Galbeta4Glc of the saccharide. Binding of sugars is driven by enthalpy and is devoid of heat capacity changes. This together with enthalpy-entropy compensation observed for these processes underscore the importance of water reorganization as being one of the principal determinant of protein-sugar interactions.

Item Type:	Conference Paper
Publisher:	Pure and Applied Chemistry
Additional Information:	Copyright of this article belongs to
Department/Centre:	Division of Biological Sciences > Molecular Biophysics Unit
Date Deposited:	16 Apr 2011 13:08
Last Modified:	20 Apr 2011 06:10
URI:	http://eprints.iisc.ac.in/id/eprint/36893

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