Sequence analysis of functional regions of homoserine dehydrogenase genes from L-lysine and L-threonine-producing mutants of Brevibacterium lactofermentum |
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| Authors: | M Sugimoto A Tanaka T Suzuki H Matsui S Nakamori H Takagi |
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| Affiliation: | Central Research Laboratories, Ajinomoto Co., Inc., Kawasaki, Japan. |
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| Abstract: | The homoserine dehydrogenase (HD) genes from Brevibacterium lactofermentum lysine- and threonine-producing mutants were cloned, using the polymerase chain reaction, and sequenced. We found the amino acid substitutions, Val104Ile in the lysine-producing mutants in which HD may cause leaky mutation and Ser393Phe in the threonine-producing mutant with feedback-insensitive HD. |
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