Journal
BIOCATALYSIS AND BIOTRANSFORMATION
Volume 24, Issue 6, Pages 409-413Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10242420601033878
Keywords
amino acid oxidase; amino transferase; non-natural amino acid; multi-enzyme reaction
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Kinetic parameters of d-amino acid oxidase from R. gracilis (DAAO) towards d-2-naphthyl alanine (D-2-NAla) and of L-aspartate amino transferase (L-AAT) from Escherichia coli towards 2-naphthyl pyruvate (2-NPA) were measured. The two enzymes were then combined in a one-pot reaction in which DAAO was used to generate 2-NPA which was the substrate of L-AAT in the presence of cysteine sulphinic acid (CSA) as an amino donor. The combined reactions afforded enantiomerically pure L-2-NAla in almost quantitative yield. The extremely low water solubility of 2-NAla can be partially overcome by running the biotransformation in suspension with higher formal concentration. In these conditions multiple enzyme additions are required.
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