Rumen bacteria variants and process for preparing succinic...

Details Rumen bacteria variants and process for preparing succinic... Rumen bacteria variants and process for preparing succinic...

2004-05-20

2008-12-30

Saidha, Tekchand (Department: 1652)

Chemistry: molecular biology and microbiology

Micro-organism, per se ; compositions thereof; proces of...

Bacteria or actinomycetales; media therefor

C435S252300, C435S430100, C435S069100, C435S145000, C435S193000, C536S023200

Reexamination Certificate

active

07470530

ABSTRACT:
Provided are novel rumen bacterial mutants resulted from the disruption of a lactate dehydrogenase gene (ldhA) and a pyruvate formate-lyase gene (pfl) from rumen bacteria; a novel bacterial mutant (Mannheimiasp. LPK7) having disruptions of a ldhA, a pfl,a phosphotransacetylase gene (pta), and a acetate kinase gene (ackA); a novel bacterial mutant (Mannheimiasp. LPK4) having disruptions of a ldhA, a pfl, and a phosphoenolpyruvate carboxylase gene (ppc) involved in the immobilization of CO2in a metabolic pathway of producing succinic acid; and a method for producing succinic acid, characterized by culture of the above mutants in anaerobic conditions. The bacterial mutants have the property of producing succinic acid at high concentration while producing little or no organic acids, as compared to the prior wild-type strains of producing various organic acids. Thus, the bacterial mutants are useful as strains for the industrial production of succinic acid.

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