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Properties of TAXI-type endoxylanase inhibitors
Kurt Gebruers1, Kristof Brijs, Christophe M Courtin
1KU Leuven, Laboratory of Food Chemistry, Kasteelpark Arenberg 20, B-3001 Louvain, Belgium. kurt.gebruers@agr.kuleuven.ac.be
Abstract:
Two types of proteinaceous endoxylanase inhibitors occur in different cereals, i.e. the TAXI [Triticum aestivum endoxylanase inhibitor]-type and XIP [endoxylanase inhibiting protein]-type inhibitors. The present paper focuses on the TAXI-type proteins and deals with their structural characteristics and the identification, characterisation and heterologous expression of a TAXI gene from wheat. In addition, to shed light on the mechanism by which TAXI-type endoxylanase inhibitors work, the enzyme specificity, the optimal conditions for maximal inhibition activity, the molar complexation ratio and the inhibition kinetics of the inhibitors are explained and the effect of mutations of an endoxylanase on the inhibition by TAXIs is discussed.
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