title: [Permeabilization of yeast Trigonopsis variabilis FA10 cells for enhancing apparent activity of D-amino acid oxidase].
abstract: D-amino acid oxidase(DAO) is an intracellular enzyme in Trigonopsis variabilis FA10. The whole cells of yeast exhibited very low DAO activity. Various treatment with physical and chemical agents, such as, freezing and thawing, acetone, butanol and cetyltrimethylammoinium bromide altered membrane permeability and increased cellular DAO activity. It was demonstrated that the performance of acetone was dependent on the concentration of the solvent, the incubation time and the temperature. Maximum enzyme activity of the cells was achieved with 30-35% acetone, between 4 degrees C and 28 degrees C. The process was very quick and permeabilization occurred in 5 minutes or less. On the other hand, the thermostability of DAO in permeabilized cells was higher than in cell extract. It was proved that Cephalosporin C could be effectively converted to glutaryl-7ACA by permeabilized Trigonopsis variabilis cells with 83% yield.
authors.affiliation: Shanghai Institute of Plant Physiology, Chinese Academy of Sciences, Shanghai 200032, China.
authors.forename: T B
authors.initials: TB
authors.lastname: Zhu
authors.forename: J
authors.initials: J
authors.lastname: Chen
authors.forename: Y F
authors.initials: YF
authors.lastname: Zhang
authors.forename: Y L
authors.initials: YL
authors.lastname: Yang
authors.forename: R S
authors.initials: RS
authors.lastname: Jiao
mesh_terms: D003605:D-Amino-Acid Oxidase / Q000378:metabolism*; D004795:Enzyme Stability; D010539:Permeability; D013696:Temperature; D015003:Yeasts / Q000201:enzymology* / Q000254:growth & development
chemical_list: D003605:D-Amino-Acid Oxidase