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- W2081791741 abstract "The lysine content of the biomass of the acidophilic facultatively methylotrophic bacterium Acetobacter methanolicus MB 58 was increased by genetic manipulations. A homoserine auxotroph, MB 58.196, and a threonine auxotroph, MB 58.195, were obtained from Acetobacter methanolicus MB 58 by N-methyl-N′-nitro-N-nitrosoguanidine treatment. Investigations of enzyme activities revealed that the homoserine auxotroph lacks homoserine dehydrogenase activity, and the threonine auxotroph lacks homoserine kinase activity. Concerning the lysine-producing ability, only the homoserine auxotrophic mutant accumulates lysine in the intracellular pool. The intracellular lysine content of this mutant was increased 40-fold. An excretion of amino acids into the medium was not detected. A homoserine resistant mutant, MB 58.196.10, isolated from MB 58.196 by UV-irradiation, was able to excrete lysine. About 95% of free lysine were found in the culture medium. Altogether, the free lysine concentration was increased 800-fold in comparison to the wild-type strain. By these genetic manipulations the total lysine concentration of MB 58.196 was increased to 2.7% and of MB 58.196.10 to 56% in comparison to the wild-type strain." @default.
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- W2081791741 date "1992-01-01" @default.
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- W2081791741 title "Isolation of auxotrophic mutants from acetobacter methanolicus MB 58" @default.
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- W2081791741 doi "https://doi.org/10.1002/abio.370120102" @default.
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