Kyowa Hakko Kogyo Co., Ltd.

Kyowa Hakko Kogyo Kabushiki Kaisha

Masahiro Sugimoto

Toshihide Nakanishi

Akio Ozaki

Satoru Furukawa

Yukinobu Kotani

Kuniki Kino

A process is disclosed for producing L-threonine, the process involves culturing in a medium a microorganism of the genus Escherichia capable of producing L-threonine which has resistance to at least one of rifampicin, lysine, methionine, aspartic acid and homoserine, or a decreased ability to degrade L-threonine, accumulating L-threonine in the culture liquor and recovering L-threonine therefrom.

Process for producing L-threonine

L-tryptophan can be prepared in good yield by a fermentation process which comprises culturing a novel L-tryptophan-producing microorganism of the genus Corynebacterium, which is resistant to at least one member selected from glyphosate [N-phosphonomethyl glycine], paraquat [1,1'-dimethyl-4,4'-bispyridinium] and derivatives thereof, and recovering L-tryptophan from the culture broth.

Process for the preparation of L-tryptophan

Growing community of inventors

Chiba, Japan

Masahiro Sugimoto