A method of producing 3-oxoadipic acid from an aliphatic compound easily utilizable by a microorganism, such as a saccharide, by utilization of a metabolic pathway of the microorganism is disclosed. The method of producing 3-oxoadipic acid includes the step of culturing at least one type of microorganism having a capacity to produce 3-oxoadipic acid, selected from the group consisting of, for example, microorganisms belonging to the genus Serratia, microorganisms belonging to the genus Corynebacterium, microorganisms belonging to the genus Hafnia, microorganisms belonging to the genus Bacillus, microorganisms belonging to the genus Escherichia, microorganisms belonging to the genus Pseudomonas, microorganisms belonging to the genus Acinetobacter, microorganisms belonging to the genus Alcaligenes, microorganisms belonging to the genus Shimwellia, microorganisms belonging to the genus Planomicrobium, microorganisms belonging to the genus Nocardioides, microorganisms belonging to the genus Yarrowia, microorganisms belonging to the genus Cupriavidus, microorganisms belonging to the genus Rhodosporidium, microorganisms belonging to the genus Streptomyces, and microorganisms belonging to the genus Microbacterium.

The present invention relates to isolated polypeptides having beta-xylosidase activity and polynucleotides encoding the polypeptides. The invention also relates to nucleic acid constructs, vectors, and host cells comprising the polynucleotides as well as methods of producing and using the polypeptides.

Provided are an engineered strain for synthesizing a dibasic organic acid and preparation and application of same. The engineered strain introduces or up-regulates expression of a positive regulator gene for synthesis of a dibasic organic acid, and/or down-regulates expression of a negative regulator gene for synthesis of a dibasic organic acid, as compared with the origin strain of the engineered strain, the producing capability for producing the dibasic organic acid is improved. The dibasic organic acid comprises malic acid, succinic acid, fumaric acid, oxaloacetic acid, glutaric acid, and adipic acid; the expression product of the positive regulator gene comprises aspartate aminotransferase, glutamic acid-aspartate transporter, C4-dicarboxylic acid transporter, pyruvate carboxylase and malate dehydrogenase, glucose transporter; the expression product of the negative regulatory gene comprises succinyl-CoA synthase, and malic acid-alpha ketoglutarate transporter, and the original strain comprises myceliophthora thermophila, thielavia terrestris, aspergillus, and rhizopus.

The present invention relates to processes for the formation of pyridinedicarboxylic acid (PDCA), in particular, 2,4-pyridinedicarboxylic acid (2,4-PDCA) and 2,5-pyridinedicarboxylic acid (2,5-PDCA), and mono- and diester derivatives thereof, from 3,4-dihydroxybenzoic acid, via a biocatalytic reaction using, for example, a protocatechuate dioxygenase such as protocatechuate 4,5-dioxygenase or protocatechuate 2,3-dioxygenase, and a nitrogen source. The invention also relates to copolymers that comprise the pyridinedicarboxylic acid monomers and derivatives thereof, processes for the formation of the copolymers and uses for the copolymers.

A method for producing a dicarboxylic acid is provided. A dicarboxylic acid is produced by culturing a bacterium having a dicarboxylic acid-producing ability, which has been modified so that the expression of one or more of the yeeA gene, ynfM gene, yjjP gene, and yjjB gene is increased, in a medium, and collecting the dicarboxylic acid from the medium.

An acidic substance having a carboxyl group is produced by culturing in a medium a microorganism which has been modified to enhance expression of the ybjL gene, and collecting the acidic substance having a carboxyl group from the medium.

An acidic substance having a carboxyl group is produced by culturing in a medium a microorganism which has been modified to enhance expression of the ybjL gene, and collecting the acidic substance having a carboxyl group from the medium.

The present invention pertains to a fermentation process for the production of an organic acid salt including the steps of fermenting a microorganism in a fermentation medium in a fermentation reactor to form a fermentation broth having an organic acid salt, wherein part of the organic acid salt is present in the solid state and part of the organic acid salt is dissolved in the fermentation broth; withdrawing at least part of the fermentation broth from the fermentation reactor, providing the broth to a hydrocyclone, and withdrawing a top effluent and a bottom effluent from the hydrocyclone; providing the bottom effluent from the hydrocyclone to a solid/liquid separation step, to form a solid fraction and a liquid fraction, providing at least 30 vol. % of the total of the top effluent from the hydrocyclone and the liquid fraction from the solid-liquid separation step to the fermentation reactor.

The present invention pertains to a fermentation process for the production of an organic acid salt including the steps of fermenting a microorganism in a fermentation medium in a fermentation reactor to form a fermentation broth having an organic acid salt, wherein part of the organic acid salt is present in the solid state and part of the organic acid salt is dissolved in the fermentation broth; withdrawing at least part of the fermentation broth from the fermentation reactor, providing the broth to a hydrocyclone, and withdrawing a top effluent and a bottom effluent from the hydrocyclone; providing the bottom effluent from the hydrocyclone to a solid/liquid separation step, to form a solid fraction and a liquid fraction, providing at least 30 vol. % of the total of the top effluent from the hydrocyclone and the liquid fraction from the solid-liquid separation step to the fermentation reactor.

The invention provides a method of producing a chemical product through continuous fermentation which includes filtering a culture of a microorganism or cultured cells with a separation membrane to recover a product from a filtrate and simultaneously retaining a nonfiltered fluid in, or refluxing it to, the culture, and adding fermentation materials to the culture, wherein a porous membrane having an average pore size of 0.01 m or more to less than 1 m is used as the separation membrane and the filtration is conducted with a transmembrane pressure difference in the range of 0.1 to 20 kPa. According to this method, the fermentation productivity of the chemical product can be largely elevated at high stability and a low cost.