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Creating space for large acceptors: rational biocatalyst design for resveratrol glycosylation in an aqueous system

Authors
  • Dirks-Hofmeister, Mareike
  • Verhaeghe, Tom
  • De Winter, Karel
  • Desmet, Tom
Publication Date
Jan 01, 2015
Source
Ghent University Institutional Archive
Keywords
Language
English
License
Unknown
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Abstract

Polyphenols display a number of interesting properties but their low solubility limits practical applications. In that respect, glycosylation offers a solution for which sucrose phosphorylase has been proposed as a cost-effective biocatalyst. However, its activity on alternative acceptor substrates is too low for synthetic purposes and typically requires the addition of organic (co-)solvents. Here, we describe the engineering of the enzyme from Thermoanaerobacterium thermosaccharolyticum to enable glycosylation of resveratrol as test case. Based on docking and modeling studies, an active-site loop was predicted to hinder binding. Indeed, the unbolted loop variant R134A showed useful affinity for resveratrol (K-m=185mM) and could be used for the quantitative production of resveratrol 3--glucoside in an aqueous system. Improved activity was also shown for other acceptors, introducing variant R134A as promising new biocatalyst for glycosylation reactions on bulky phenolic acceptors.

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