Metabolically engineered microbial cell with an altered metabolite production

摘要

A recombinant microbial cell comprises at least one increased expressible enzyme activity controlling anabolic metabolism of ammonia as a nutrient source, the increased enzyme activity being an NADH-dependent activity catalysing the reaction (a) 2-oxoglutarate+NH₃+NADH->glutamate+NAD or being an activity catalysing the reaction (b) 2-oxoglutarate+glutamine+NADH->2 glutamate+NAD or being an activity catalysing the reaction (c) glutamate+NH₃+ATP->glutamine+ADP+Pi. The increased enzyme activity is encoded by a nucleic acid coding sequence linked to an expression signal not natively associated with the nucleic acid coding sequence and is increased as compared to the expression of the enzyme activity when the nucleic acid coding sequence is associated with its native expression signal.