Thermodynamic Analysis of Chitooligosaccharide Binding to Urtica dioica agglutinin by Isothermal Titration Calorimetry

Katiyar, Samiksha and Van Damme, EJM and Peumans, Willy J and Surolia, Avadhesha (1999) Thermodynamic Analysis of Chitooligosaccharide Binding to Urtica dioica agglutinin by Isothermal Titration Calorimetry. In: Bioscience Reports, 19 (5). pp. 411-419.

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Abstract

UDA (Urtica dioica agglutinin) contains two hevein like domains with two non-identical interacting sites and is specific for chitooligosaccharides. The binding of chitooligosaccharides to UDA was studied by Isothermal Titration Calorimetry. Each site is composed of three subsites, each binding to a sugar residue. Thermodynamic parameters obtained show that while chitobiose has two independent non-interacting sites, chitotriose, chitotetrose and chitopentose have two interacting sites on each monomer of UDA. Values of binding enthalpy $(\Delta H)$ increase almost by a factor of 7 in going from chitobiose to chitotriose indicating the existence of three subsites in the combining site of UDA. The binding constant for chitotetrose and chitopentose increase without any further enhancement in the values of $\Delta H$ indicating that for oligomers larger than chitotriose interaction is favoured entropically.

Item Type:	Journal Article
Publication:	Bioscience Reports
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer.
Keywords:	Urtica dioica agglutinin;Chitooligosaccharide-binding lectin;Isothermal titration calorimetry;Thermodynamic parameters
Department/Centre:	Division of Biological Sciences > Molecular Biophysics Unit
Date Deposited:	01 Oct 2007
Last Modified:	19 Sep 2010 04:39
URI:	http://eprints.iisc.ac.in/id/eprint/12021

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