Improved conversion of methanol to single-cell protein by Methylophilus methylotrophus

Abstract
The glutamate dehydrogenase gene of Escherichia coli was cloned into broad host-range plasmids and can complement glutamate synthase mutants of M. methylotrophus. Assimilation of NH3 via glutamate dehydrogenase is more energy-efficient than via glutamate synthase, thus the recombinant organism converts more growth substrate, methanol, into cellular C.