New Biotechnology 2013-06-25

Engineering transglycosidase activity into a GH51 α-l-arabinofuranosidase.

Faten Arab-Jaziri, Bastien Bissaro, Michel Dion, Olivier Saurel, David Harrison, Fernando Ferreira, Alain Milon, Charles Tellier, Régis Fauré, Michael J O'Donohue

Index: New Biotechnology 30(5) , 536-44, (2013)

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Abstract

Directed evolution was applied to the α-l-arabinofuranosidase from Thermobacillus xylanilyticus to confer better transglycosylation ability, particularly for the synthesis of benzyl α-l-arabinofuranosyl-(1,2)-α-d-xylopyranoside, starting from p-nitrophenyl α-l-arabinofuranoside (donor) and benzyl α-d-xylopyranoside (acceptor). The aim was to obtain mutants displaying both lower hydrolytic and greater transglycosylation activities to favour the stable production of the target disaccharide. The implementation of a simple chromogenic screen ultimately provided three mutant enzymes whose properties correspond to those sought after. These all displayed lowered hydrolytic activity and conserved or slightly improved transfer activity, while one of them also displayed lowered secondary hydrolysis of the transglycosylation product. DNA sequence analysis of the mutants revealed between three and seven point mutations and biochemical analysis combined with STD-NMR experiments indicated that distinct molecular mechanisms were active among the three mutants. Copyright © 2013 Elsevier B.V. All rights reserved.