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A whole cell biotransformation system for reductive amination has been studied in recombinant Escherichia coli cells. Reductive amination of 2-keto-3-methylvalerate to l-isoleucine by a two-enzyme-cascade was achieved by overproduction of endogenous l-alanine dependent transaminase AvtA and heterologous l-alanine dehydrogenase from Bacillus subtilis in recombinant E. coli. Up to 100mM l-isoleucine...
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