The present invention relates to a method for selectively producing ginsenoside F2, compound Mc or compound O, which is originally present in ginseng in a trace amount, from a saponin of ginseng, and more specifically to a method capable of obtaining desired target compounds, that is, ginsenoside F2, compound Mc and compound O, in high yields, by treating saponins, obtained from ginseng, with particular enzymes to structurally convert the saponins.

The present invention relates to a method for selectively producing ginsenoside Rd, which is originally present in ginseng in a trace amount, from panaxadiol-type saponins of ginseng, and more specifically to a method capable of obtaining a desired target compound, that is, ginsenoside Rd, in high yields, by treating a panaxadiol-type saponin obtained from ginseng, with particular enzymes to structurally convert the saponins.

The present invention relates to a method for selectively producing ginsenoside Rd, which is originally present in ginseng in a trace amount, from panaxadiol-type saponins of ginseng, and more specifically to a method capable of obtaining a desired target compound, that is, ginsenoside Rd, in high yields, by treating a panaxadiol-type saponin obtained from ginseng, with particular enzymes to structurally convert the saponins.

Disclosed are a composition for production of ginsenoside compound K using a high temperature-?-glycosidase and a high temperature-?-L-arabinofuranosidase, and a method for preparing ginsenoside compound k. The composition for producing ginsenoside compound k and the method for preparing ginsenoside compound k according to one aspect of the present invention allow high temperature-?glycosidase and high temperature-a-L-arabinofuranosidase to exhibit stable activity even at high temperatures, thereby increasing a reaction rate. The composition for producing ginsenoside compound k and the method for preparing ginsenoside compound k according to one aspect of the present invention allow a large quantity of ginsenoside compound k to be produced in a short time, thereby exhibiting an effect of producing a high yield, and thus can be utilized industrially.

Disclosed are a composition for production of ginsenoside compound K using a high temperature-?-glycosidase and a high temperature-?-L-arabinofuranosidase, and a method for preparing ginsenoside compound k. The composition for producing ginsenoside compound k and the method for preparing ginsenoside compound k according to one aspect of the present invention allow high temperature-?glycosidase and high temperature-a-L-arabinofuranosidase to exhibit stable activity even at high temperatures, thereby increasing a reaction rate. The composition for producing ginsenoside compound k and the method for preparing ginsenoside compound k according to one aspect of the present invention allow a large quantity of ginsenoside compound k to be produced in a short time, thereby exhibiting an effect of producing a high yield, and thus can be utilized industrially.

The subject of the present invention is a whole-cell catalysis process for converting substrates of cytochrome P450 monooxygenases of eukaryotic origin into valuable biotechnological products. The subject of the present invention is also microorganisms genetically engineered to achieve those biotransformations with high rates and processes to prepare these microorganism strains.

The subject of the present invention is a whole-cell catalysis process for converting substrates of cytochrome P450 monooxygenases of eukaryotic origin into valuable biotechnological products. The subject of the present invention is also microorganisms genetically engineered to achieve those biotransformations with high rates and processes to prepare these microorganism strains.

The present invention discloses a Mycobacterium neoaurum-derived steroid C27-monooxygenase and an application thereof, which belong to the technical fields of genetic engineering and enzyme engineering. By the method of gene knockout and intensive expression, the present invention screens out three isoenzymes of a key enzyme SMO in the process of degrading sterol side chains from Mycobacterium neoaurum. The three isoenzymes are intensively expressed respectively in the Mycobacterium neoaurum for the high yield of androsta-1,4-diene-3,17-dione (ADD), the yield of ADD is increased remarkably, wherein the effect of SMO2 is most remarkable. By overexpressing SMO2, the final ADD yield is increased from 5.2 g.Math.L..sup.1 to 7.3 g.Math.L..sup.1. The present invention provides a helpful guidance for the industrialization of the microbial fermentation method for increasing the ADD yield.

The present invention relates to a method for selectively producing ginsenoside Rd, which is originally present in ginseng in a trace amount, from panaxadiol-type saponins of ginseng, and more specifically to a method capable of obtaining a desired target compound, that is, ginsenoside Rd, in high yields, by treating a panaxadiol-type saponin obtained from ginseng, with particular enzymes to structurally convert the saponins.

The present invention relates to a method for selectively producing ginsenoside Rd, which is originally present in ginseng in a trace amount, from panaxadiol-type saponins of ginseng, and more specifically to a method capable of obtaining a desired target compound, that is, ginsenoside Rd, in high yields, by treating a panaxadiol-type saponin obtained from ginseng, with particular enzymes to structurally convert the saponins.