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- W894987658 abstract "The growth of Brevibacterium flavum No. 2247 was inhibited over 90% at a concentration above 1 mg/ml of α-amino-β-hydroxyvaleric acid, a threonine analogue, and the inhibition was reversed by the addition of l-threonine, and to lesser extent by l-leucine, l-isoleucine, l-valine and l-homoserine. l-Methionine stimulated the inhibition. Several mutants resistant to the analogue produced l-threonine in the growing cultures. The percentage of l-threonine producer in the resistant mutants depended on the concentration of the analogue, to which they were resistant. The best producer, strain B-183, was isolated from resistant strains selected on a medium containing 5 mg/ml of the analogue. Mutants resistant to 8 mg/ml of the analogue was derived from strain B-183 by the treatment with mutagen, N-methyl-N’-nitro-N-nitrosoguanidine. Among the mutants obtained, strain BB-82 produced 13.5 g/liter of l-threonine, 30% more than did the parental strain. Among the resistant mutants obtained from Corynebacterium acetoacidophilum No. 410, strain C-553 produced 6.1 g/liter of l-threonine. Several amino acids other than l-threonine were also accumulated, and these accumulations of amino acids were discussed from the view of regulation mechanism of l-threonine biosynthesis." @default.
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- W894987658 date "1970-03-01" @default.
- W894987658 modified "2023-09-27" @default.
- W894987658 title "Microbial Production ofl-Threonine" @default.
- W894987658 doi "https://doi.org/10.1080/00021369.1970.10859633" @default.
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