| Project/Area Number |
07556027
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (A)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 試験 |
|---|
| Research Field |
Bioproduction chemistry/Bioorganic chemistry
|
|---|
| Research Institution | The University of Tokyo |
|---|
Principal Investigator |
YAMAZAKI Sunao Univ.of Tokyo, dept.of Applied Biochemistry, Professor, 大学院・農学生命科学研究科 (00011982)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
YOSHIMURA Etsuro Univ.of Tokyo, dept.of Appl.Biochem., Assoc.Professor, 大学院・農学生命科学研究科, 助教授 (10130303)
OKUBO Akira Univ.of Tokyo, dept.of Appl.Biochem., Assoc.Professor, 大学院・農学生命科学研究科, 助教授 (20111479)
SATOH Toshio Hiroshima, Univ., Fac.of Sci., Professor, 理学部, 教授 (90087130)
|
|---|
| Project Period (FY) |
1995 – 1996
|
| Project Status |
Completed (Fiscal Year 1996)
|
| Budget Amount *help |
¥9,600,000 (Direct Cost: ¥9,600,000)
Fiscal Year 1996: ¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1995: ¥6,800,000 (Direct Cost: ¥6,800,000)
|
|---|
| Keywords | DMSO reductase / Rhodobacter sphaeroides / reduction of sukfoxide / reduction of N-oxide / asymmetric synthesis / stereoselective synthesis / 不斉合成 / キラルスルホキシド / N-オキシド / 不斉還元 / 脱窒光合成細菌 / Rhodobacter Sphaeroides / スルフォキシド還元 / 不斉還元合成 / 微生物還元 |
|---|
| Research Abstract |
Dimethyl sulfoxide reductase (DMSO-R) isolated from the photosynthetic denitrifyingbacterium, Rhodobacter sphaeroides f.sp. denitrificans, reduces not only varieties of sulfoxides to the corresponding sulfides but also N-oxides to their reduced forms. In the case of sulfoxide reduction, the enzyme recognizes the stereochemistry of asymmetric sulfoxides, i.e., (S) -methylphenylsulfoxide (MPSO) of the racemic mixtureis exclusivelyreduced to the sulfide and 100% e.e.(R) isomer is recovered. MPSO and other alkylaryl sulfoxides (RArSO) were synthesized and assayd for the stereoselectivity of DMSO-R as well as for the kinetic parameters, Vmax and Km. Reaction rate was well monitored by capillary electrophoresis using the micellar electrokinetic chromatographic mode. Stereospecific reaction pattern of the enzyme was clearly solved for the synthesized substrates, RArSO.Three preparative methods to obtain optically pure sulfoxides were examined : (1) reduction by in vitro enzyme reaction which requires pure enzymes ; (2) biotransformation by adding substrates to the culture of Rhodobacter sphaeroides in which DMSO-R was beforehand induced and (3) reduction in bioreactor using immobilized DMSO-R.MTSO and methyltolylsulfoxide (MTSO) which are important intermediates for the asymmetric organic synthesis were applied to the method (2) and optically pure (R) isomers were obtained in gram-order yield.
|
