Cj Cheiljedang Corporation

Kyung Han Lee

Jun Ok Moon

Hyung Joon Kim

Kwang Ho Lee

Sang Jo Lim

Chang Gyeom Kim

Lan Huh

Jin Suck Sung

So Yeon Rah

Jin Seok Sung

Hyun Joon Kim

Hyo Jin Kim

Jong Chul Kim

Tae Han Kim

Jae Woo Jang

Sang Hee Park

Hyun Won Bae

Hyun Ae Bae

Do Hyun Kwon

Dae Cheol Kim

The present invention relates to a method for producing highly-concentrated L-amino acid and riboflavin simultaneously, and a microorganism for simultaneously producing L-amino acid and riboflavin. Specifically, the present invention relates to a modified microorganism for producing L-lysine or L-threonine, and riboflavin simultaneously, wherein the microorganism belonging tosp. capable of producing L-lysine or L-threonine is modified by enhancing the activity of an enzyme family expressed by a rib operon which contains riboflavin biosynthesis gene family. Also, the present invention relates to a method for the simultaneous production of L-lysine or L-threonine, and riboflavin using the modified microorganism, and relates to a formulation or granular formulation, feed, and feed additive, containing L-lysine or L-threonine, and riboflavin produced from a culture medium of the modified microorganism.

Microorganism for simultaneously producing L-amino acid and riboflavin, and method for producing L-amino acid and riboflavin using same

The present invention relates to microorganisms ofwhich can utilize xylose and to a method for producing L-lysine using same. More particularly, the present invention relates to microorganisms ofwhich are modified, in which genes encoding xylose isomerase and xylulokinase which are xylose synthases are introduced to express the xylose synthase. The present invention also relates to a method for producing L-lysine, comprising a step of culturing the modified microorganisms ofusing xylose as a carbon source, and recovering L-lysine from the culture.

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The present invention relates tosp. that is transformed with ansp.-derived fructokinase gene to express fructokinase showing a sufficient activity of converting fructose into fructose-6-phosphate, thereby preventing unnecessary energy consumption, and a method for producing L-amino acids using the strain. The transformedsp. of the present invention is able to express fructokinase from the-derived fructokinase gene to prevent unnecessary energy consumption during fructose metabolism, leading to more cost-effective production of L-amino acids. Therefore, it can be widely used for the effective production of L-amino acids.

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Seoul, South Korea

Kyung Han Lee