摘要:
The present invention features improved methods for the enhanced production of pantoate and pantothenate utilizing microorganisms having modified pantothenate biosynthetic enzyme activities and having modified methylenetetrahydrofolate (MTF) biosynthetic enzyme activities. In particular, the invention features methods for enhancing production of desired products by increasing levels of a key intermediate, ketopantoate, by increasing enzymes or substrates that contribute directly or indirectly to its synthesis. Recombinant microorganisms and conditions for culturing same are also are featured. Also featured are compositions produced by such microorganisms.
摘要:
The invention relates to cyanide tolerant nitrilhydratases produced from Pseudomonas genus microorganisms which exhibit a high cyanide tolerance. Said invention also relates to the use of said compounds for producing amides from nitriles in the presence of cyanides, polynucleotide sequences coding for said enzymes and and said enzymes.
摘要:
The invention relates to a process for the preparation of D-pantothenic acid and/or salts thereof or feedstuffs additives comprising these by fermentation of microorganisms of the Enterobacteriaceae family, in particular those which already produce D-pantothenic acid, in which the nucleotide sequence(s) in the microorganisms which code(s) for the fda gene is/are enhanced, in particular over-expressed.
摘要:
The invention concerns a method for making amides which consists in hydrating a nitrile into a corresponding amide, in the presence of a nitrile-hydratase of microbiological origin. The invention is characterized in that said nitrile hydratase is produced by a bacterium belonging to the genus Rhodococcus pyridinovorans.
摘要:
An objective of the present invention is to provide a nitrile hydratase capable of producing 2-hydroxy-4-methylthiobutyroamide. The present invention provides a novel nitrile hydratase producing alpha -hydroxyamide using alpha -hydroxynitrile as the substrate, and the encoding DNA thereof. The enzyme can be obtained from Rhodococcus sp. Further, the enzymatic activity of the enzyme can be maintained stably during the reaction. The present invention provides a method for producing amide compounds,the method comprising the step of reacting this enzyme to nitrile compounds. According to the present invention, from hydroxy nitrile compounds, corresponding amide compounds can be produced biochemically without reducing the enzyme activity of nitrile hydratase.
摘要:
The invention provides a process for the fermentative preparation of D-pantothenic acid and/or salts thereof or feedstuffs additives comprising these by fermentation of microorganisms of the Bacillus group, in particular those which already produce D-pantothenic acid, which comprises attenuating, eliminating or expressing at a low level in the microorganisms one or more of the nucleotide sequence(s) which code(s) for the gene or ORF azlC, azlD, ydaP and pckA or of the proteins coded by these.
摘要:
The present invention features improved methods for the enhanced production of pantoate and pantothenate utilizing microorganisms having modified pantothenate biosynthetic enzyme activities and having modified methylenetetrahydrofolate (MTF) biosynthetic enzyme activities. In particular, the invention features methods for enhancing production of desired products by increasing levels of a key intermediate, ketopantoate by enzymes that contribute to its synthesis. Recombinant microorganisms and conditions for culturing same are also are featured. Also featured are compositions produced by such microorganisms.
摘要:
An industrially advantageous process for producing a substance wherein the production speed of a reaction product in a reaction with the use of a microbial catalyst can be maintained at a constant level over a long period of time. In a reaction with the use of a microbial catalyst (for example, resting cells of an arthrobacter capable of converting a-hydroxynitriles into the corresponding alpha -hydroxy acid amides or alpha -hydroxy acid ammonium salts), the substance is produced at a constant speed by adding the substrate at a constant speed, regulating the concentration of the microbial catalyst in the liquid reaction mixture at a constant level and controlling the temperature so as to rise the reaction temperature at the point that the enzymatic activity of the microbial catalyst is lowered in the course of the reaction so as to maintain the reaction speed at a constant level.
摘要:
A process for producing an amide compound from a nitrile compound by using a microbial catalyst characterized in that microbial cells having a nitrile hydratase activity of at least 50 U/mg dry cells at a reaction temperature of 10 DEG C, which are not in comprehensively immobilized, are brought into contact with a nitrile compound in an aqueous medium. According to this process in which microbial cells overexpressing the nitrile hydratase activity are used without comprehensive immobilization, the amide compound can be efficiently produced from the nitrile compound without causing the problem of lowering in the reaction speed or a decrease in the productivity per unit amount of the microbial cells due to the comprehensive immobilization. Accordingly, the amide compound can be produced within an extremely short period of time in case of a batch reaction, or by using equipment on a very small scale in case of a continuous reaction.
摘要:
The invention relates to a process for the preparation of D-pantothenic acid by fermentation of coryneform bacteria, in which bacteria in which the nucleotide sequence which codes for pyruvate oxidase (EC 1.2.2.2) (poxB gene) is attenuated are employed, the following steps being carried out: a) fermentation of D-pantothenic acid-producing bacteria in which at least the gene which codes for pyruvate oxidase is attenuated. b) concentration of the D-pantothenic acid in the medium or in the cells of the bacteria; and c) isolation of the D-pantothenic acid produced.