摘要:
To provide a method for preparing optically active compounds, which mainly contain (R)-amino compounds, by microbial enzymes efficiently and inexpensively; a polypeptide having stereoselective transaminase activity which can be suitably used for the above preparation method; and a DNA encoding the polypeptide. A method for preparing an optically active amino compound, characterized in stereoselectively transaminating by acting a transaminase on an amino group acceptor, a ketone compound in the presence of an amino group donor, a primary amine; a DNA comprising a nucleotide sequence encoding a polypeptide having stereoselective transaminase activity; and a polypeptide having stereoselective transaminase activity obtainable from a culture of a microorganism belonging to the genus Arthrobacter.
摘要:
The method for preparing an optically active (R)-amino compound characterized by the method comprising stereoselectively carrying out amino group transfer by action of an (R)-form-specific transaminase in the co-presence of a ketone compound (amino acceptor), and an amino compound (amino donor) of a racemic form or an (R)-form, to give an optically active (R)-amino compound. According to the present invention, it is made possible to easily prepare at a high yield the optically active (R)-amino compounds and the like having an aryl group and the like at their 1-position, which have been conventionally difficult to prepare.
摘要:
The method for preparing an optically active (R)-amino compound characterized by the method comprising stereoselectively carrying out amino group transfer by action of an (R)-form-specific transaminase in the co-presence of a ketone compound (amino acceptor), and an amino compound (amino donor) of a racemic form or an (R)-form, to give an optically active (R)-amino compound. According to the present invention, it is made possible to easily prepare at a high yield the optically active (R)-amino compounds and the like having an aryl group and the like at their 1-position, which have been conventionally difficult to prepare.
摘要:
A process of manufacturing optically active (S)-1,2-diols, wherein (R)-1,2-diols represented by the general formula [I] ##STR1## (where: R represents a substituted or unsubstituted alkyl group, alkenyl group, aryl group or aralkyl group) or a mixture of diols of the general formula [I] and (S)-1,2-diols represented by the general formula [II] ##STR2## (Where: R represents the same as above) having an opposite configuration to the general formula [I] is subjected to the action of a microorganism capable of selectively metabolizing the diols of the general formula [I], or capable of converting the diols of the general formula [I] into the diols of the general formula [II], or having the both capabilities, and the formed and accumulated (S)-1,2-diols of the general formula [II] is collected. According to the present invention, optically active (S)-1,2-diols can be produced commercially and advantageously.
摘要:
A process is disclosed in which an optically active monoalkyl ester of .beta.-(S)-aminoglutaric acid is prepared by subjecting a dialkyl ester of .beta.-protected aminoglutaric acid to the action of a culture broth, cells, or treated cells of a microorganism capable of stereoselectively hydrolyzing only one of the ester groups in the above-mentioned dialkyl ester to produce an optically active monoalkyl ester of .beta.-protected (S)-aminoglutaric acid, and then removing the amino-protecting group from the product. An optically active monoalkyl ester of .beta.-(S)-aminoglutaric acid is useful as a starting material for synthesizing .beta.-lactam antibiotics of carbapenem type such as thienamycin.
摘要:
A process for producing D-.beta.-hydroxyalkanoic acids by utilizing microorganisms having an ability of stereospecifically converting alkanoic acids, 2-alkenoic acids or alcohols into D-.beta.-hydroxyalkanoic acids.
摘要:
A process is disclosed wherein D(-)-.beta.-hydroxyisobutyric acid is produced fermentatively from isobutyric acid or methacrylic acid by the stereoselective action of microorganisms having the ability to convert isobutyric acid or methacrylic acid into D(-)-.beta.-hydroxyisobutyric acid in an aqueous medium, and D(-)-.beta.-hydroxyisobutyric acid is recovered from the aqueous medium.
摘要:
A positioning apparatus for a moving object includes: a driving unit including a stator and a movable element connected to the moving object via a connecting member; a chassis which includes an opening which allows movement of the connecting member upon driving of the movable element, and an exhaust outlet which includes end exhaust outlets arranged at first and second ends of the driving range of the movable element; an exhaust unit which exhausts a gas in the chassis; and a controller which controls the exhaust unit so that an amount of exhaust from the end exhaust outlet arranged at the first end becomes larger when the movable element is driven toward the first end on a side of the first end of the driving range than when the movable element is positioned at the center of the driving range.
摘要:
A positioning apparatus for a moving object includes: a driving unit including a stator and a movable element connected to the moving object via a connecting member; a chassis which includes an opening which allows movement of the connecting member upon driving of the movable element, and an exhaust outlet which includes end exhaust outlets arranged at first and second ends of the driving range of the movable element; an exhaust unit which exhausts a gas in the chassis; and a controller which controls the exhaust unit so that an amount of exhaust from the end exhaust outlet arranged at the first end becomes larger when the movable element is driven toward the first end on a side of the first end of the driving range than when the movable element is positioned at the center of the driving range.
摘要:
A process is disclosed wherein coenzyme Q is prepared from tissues of animals and plants or microbial cells by treating a water suspension of said materials with an alkali, or with an acid and then an alkali, and by extracting the treated suspension with at least one water-immiscible organic solvent followed by recovery of coenzyme Q from the extract.