Abstract

Artificial cells containing malate dehydrogenase (EC 1.1.1.37), leucine dehydrogenase (EC 1.4.1.9), urease (EC 3.5.1.5), and dextran-NAD + were prepared. This immobilized multienzyme system effectively converted ammonia or urea into essential amino acids, L-leucine, L-valine and L-isoleucine. L-malate acted as a cosubstrate for the regeneration of dextran-NADH. Greater concentrations of L-malate favored higher conversion ratios. The effects of ammonium salts and urea on the reaction rate were also studied. The reaction rates in ammonium salt solutions were 36.9–78.2% of those in urea solutions.

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