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Issue 84, 2016, Issue in Progress
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Efficient access to l-phenylglycine using a newly identified amino acid dehydrogenase from Bacillus clausii

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Abstract

An amino acid dehydrogenase from Bacillus clausii (BcAADH) was identified and overexpressed in Escherichia coli BL21(DE3) for the preparation of L-phenylglycine from benzoylformic acid. Recombinant BcAADH was purified to homogeneity and characterized. BcAADH could catalyse reductive amination and oxidative deamination at optimum pHs of 9.5 and 10.5. Furthermore, BcAADH has a broad substrate spectrum, displaying activities toward various aromatic and aliphatic keto acids. When coexpressed with glucose dehydrogenase from Bacillus megaterium, the potential application of BcAADH in the preparation of L-phenylglycine was investigated at a high substrate loading and low biocatalyst addition. As much as 400 mM benzoylformic acid could be fully reduced into L-phenylglycine within 6 h at >99.9% ee. With merely 0.5 g DCW L−1, 200 mM benzoylformic acid was completely reduced, resulting in a substrate to biocatalyst ratio of 60 g g−1, environmental factor of 4.7 and 91.7% isolation yield at gram scale. This study provides guidance for the application of BcAADH in the synthesis of chiral non-natural amino acids.

Graphical abstract: Efficient access to l-phenylglycine using a newly identified amino acid dehydrogenase from Bacillus clausii

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Supplementary files

Article information


Submitted
11 Jul 2016
Accepted
16 Aug 2016
First published
16 Aug 2016

RSC Adv., 2016,6, 80557-80563
Article type
Paper

Efficient access to L-phenylglycine using a newly identified amino acid dehydrogenase from Bacillus clausii

J. Cheng, G. Xu, R. Han, J. Dong and Y. Ni, RSC Adv., 2016, 6, 80557
DOI: 10.1039/C6RA17683F

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