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PEDS Advance Access originally published online on November 7, 2008
Protein Engineering Design and Selection 2009 22(1):37-44; doi:10.1093/protein/gzn065
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Digital screening methodology for the directed evolution of transglycosidases

Fankroma M.T. Koné, Mickaël Le Béchec, Jean-Pierre Sine, Michel Dion and Charles Tellier1

Biotechnologie, Biocatalyse, Biorégulation, Faculté des Sciences et des Techniques, Université de Nantes, UMR CNRS 6204, 2, rue de la Houssinière, BP 92208, Nantes, F-44322 France

1 To whom correspondence should be addressed. E-mail: charles.tellier{at}univ-nantes.fr

Engineering of glycosidases with efficient transglycosidases activity is an alternative to glycosyltransferases or glycosynthases for the synthesis of oligosaccharides and glycoconjugates. However, the engineering of transglycosidases by directed evolution methodologies is hampered by the lack of efficient screening systems for sugar-transfer activity. We report here the development of digital imaging-based high-throughput screening methodology for the directed evolution of glycosidases into transgalactosidases. Using this methodology, we detected transglycosidase mutants in intact Escherichia coli cells by digital imaging monitoring of the activation of non- or low-hydrolytic mutants by an acceptor substrate. We screened several libraries of mutants of β-glycosidase from Thermus thermophilus using this methodology and found variants with up to a 70-fold overall increase in the transglycosidase/hydrolysis activity ratio. Using natural disaccharide acceptors, these transglycosidase mutants were able to synthesise trisaccharides, as a mixture of two regioisomers, with up to 76% yield.

Keywords: digital imaging/directed evolution/high-throughput screening/transglycosidases

Received July 23, 2008; revised September 30, 2008; accepted October 9, 2008.


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