摘要:
The disclosure describes the production of anticancer agent LL-D45042, having the structure: 1 by fermentation, to methods for the recovery and concentration of this anticancer agent from crude solutions, and to processes for the purification of this anticancer agent as well as a new microorganism of the species Streptomyces hygroscopicus LL-D45042 and mutants thereof useful in the preparation of this compound.
摘要:
Recombinant host cells that produce rapamycin analogues are constructed by deleting or modifying rapamycin biosynthetic gene cluster genes and are useful in the production of compounds used as antifungals, anticancers, immunosuppressants, and neurotrophins.
摘要:
A new method for producing phycoerythrin with high optical density nullODnull from the group selected from an algae whose life cycle has sexual reproduction, asexual reproduction, and vegetative propagation, such as Galaxaura oblongata, Halymenia ceylanica, Helminthocladia australis, and Porphyra dentata.
摘要:
The present invention provides process for making biotin from desthiobiotin either contacting desthiobiotin with an enzyme reaction mixture containing bioB gene product and nifU gene product and/or nifS gene product and isolating the biotin or cultivating a microorganism transformed with DNA encoding the bioB gene product, nifU gene product and nifS gene product and isolating the biotin.
摘要:
A process for the production of clavulanic acid and pharmaceutically acceptable salts thereof by a) fermentation of a micro-organism which is capable to produce clavulanic acid b) isolation of clavulanic acid from the fermentation broth c) purification of clavulanic acid, e.g. via a salt thereof d) conversion of the purified clavulanic acid of step c), e.g. of a salt thereof into a pharmaceutically acceptable salt of clavulanic acid, wherein the fermentation broth is extracted with a solvent prior to isolation of clavulanic acid.
摘要:
The invention discloses a yeast with high biotin-productivity and the preparation method thereof. The yeast is transformed by an integrated plasmid, which includes a biotin synthase gene, an assistant DNA sequence for the integration of the plasmid into a host genome, a promoter sequence, and a selection marker.
摘要:
The use of enzymes which catalyze the production of starter and extender units for polyketides is described. In addition, modified loading modules are described, which can accept a variety of starting units such as substituted benzoates, and which can be used to generate substituted derivatives of natural products. These enzymes may be used to enhance the yield of polyketides that are natively produced or polyketides that are rationally designed. By using these techniques, the synthesis of a complete polyketide has been achieved in E. coli. Production can be enhanced in microbial organisms of polyketides and other secondary metabolites by delaying production until after exponential phase and by maintaining relatively constant nutrient levels in the medium. In addition, polyketide production can be enhanced by providing an expression system for a thioesterase II. Thus, by modifying the host organism and changing the culture conditions, synthesis of a secondary metabolite can be enhanced. The present invention also results in a host organism with desirable characteristics to be used in the production of such polyketides and to assess the results of gene shuffling.
摘要:
The present invention concerns an enzymatic oxidative deamination process of a dipeptide monomer to prepare an intermediate useful to prepare compounds having endopeptidase and angiotensin converting enzyme inhibition activity.