摘要:
A fermentation process is disclosed for producing L-glutamic acid in high yield using microorganisms belonging to the genus Corynebacterium or Brevibacterium having the ability to produce L-glutamic acid and which have or have been endowed with a resistance to one or more antibiotics of the type which inhibit energy metabolism and selected from oligomycin, antimycin A, rutamycin, and valinomycin.
摘要:
A process for preparing (+)-homopilopic acid and the salts thereof which comprises hydrolyzing a mixture of (+)-homopilopic acid ester of the general formula (I): wherein R₁ denotes a straight or branched C₁-C₁₀ hydrocarbon, and (-)-homopilopic acid ester of the general formula (II): wherein R₂ denotes a straight or branched C₁-C₁₀ hydrocarbon, in the presence of a culture, cells, culture supernatant or treated matter of a microorganism belonging to the genus Arthrobacter , Aspergillus , Escherichia , Cunninghamella , Xanthomonas , Candida , Pseudomonas , Serratia , Cellulomonas , Nocardia , Bacillus , Brevibacterium , Flavobacterium , Mycobacterium , Rhizomucor , Rhodotorula or Rhodococcus .
摘要:
A method for producing L-threonine, which comprises subjecting at least L- or DL-aspartic acid or a salt thereof to enzymatic reaction according to the reaction system not accompanied with growth of microorganism cells in an aqueous solution in the presence of a microorganism and collecting L-threonine formed, wherein the microorganism is a biotin-requiring microorganism for the growth belonging to coryneform bacterium; a plasmid comprising a DNA fragment containing at least a gene encoding biosynthesis of threonine which can be expressed within a biotin-requiring microorganism cell for the growth belonging to coryneform bacterium and a DNA fragment containing a gene encoding autonomous replication within coryneform bacterium cell; and a biotin-requiring microorganism for the growth belonging to coryneform bacterium which has been transformed with the plasmid described above, both of which are employed in the present method. According to the present invention, L-threonine can be produced with good yield, and further since production management becomes extremely easy without requiring cumbersome operation such as sterilization of the medium, etc. as in the fermentation method, L-threonine can be produced inexpensively in industry.
摘要:
A fermentation process is disclosed for producing L-glutamic acid in high yield using microorganisms belonging to the genus Corynebacterium or Brevibacterium having the ability to produce L-glutamic acid and which have or have been endowed with a resistance to one or more antibiotics of the type which inhibit energy metabolism and selected from oligomycin, antimycin A, rutamycin, and valinomycin.
摘要:
Die Erfindung betrifft ein Verfahren zur fermentativen Herstellung von L-Isoleucin aus D,L-α-Hydroxybutyrat durch D-Lactat verwertende Mutanten der Gattung Corynebacterium.
摘要:
A method for the production of a 1,2,4-triazole nucleoside comprising the step of reacting a ribose donor with a triazole compound in the presence of an enzyme preparation derived from Brevibacterium acetylicum is disclosed. The method is characterized in that the ribose donor is guanosine; the concentration of the donor is above 100 mM; and the enzyme preparation is added before the reaction mixture gells. The method is capable of high production rates and high concentrations of the final product.
摘要:
An aqueous culture medium is prepared containing preferably ethanol and/or glucose as carbon sources and inorganic salts and 0-l-20 w/v of L- or DL-homoserine; cells of biotin requiring microorganism of genus Brevibacterium , exemplified as 4 strains of Brevibacterium flavum, ammonigenes or divaricatum ,or an immobilized form of these cells are added and they provide enzyme to convert the homoserine to L-threonine by racemization during cultivation at 20 to 50°C for l0 to 72 hours; L-threonine is separated and purified. The homoserine can be obtained as residue from enzymatic racemization of DL-homoserine using e.g. a Pseudomonas putida strain.