| Project/Area Number |
10660110
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Bioproduction chemistry/Bioorganic chemistry
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
KANO Kenji Kyoto Univ., Grad. Sch. Agric., Assoc. Prof., 農学研究科, 助教授 (10152828)
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| Co-Investigator(Kenkyū-buntansha) |
IKEDA Tokuji Kyoto Univ., Grad. Sch. Agric., Prof., 農学研究科, 教授 (40026422)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 1999: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1998: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | Nicotinic Acid / 6-Hydroxynicotinic Acid / Column Electrolysis / Electrochemical Complete Hydroxylation / Nicotinic Dehydrogenase / Absolute and Sensitive Analysis / Biotransformation / Electron Transfer Mediator |
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| Research Abstract |
Focusing our attention to a biotransformation system from nicotinic acid (NA) into 6-hydroxynicotinic acid (6HNA) by Pseudomonas fluorescens TN-5, the electron transfer from the cell to column electrodes has been realized using ferricyanide as an exogenous electron acceptor. The hydoxylation is remarkably accelerated using such exogenous electron transfer mediator, in place of the native final electron acceptor OィイD22ィエD2. In addition, the succeeding reaction of 6HNA can be completely suppressed by the use of the exogenous electron transfer mediator.
Based on the results, an electrochemically accelerated and 100% biotransformation system has been realized on our column electrolytic system, where Pseudomonas fluorescens TN-5 cells were immobilized on a column electrode. Such complete biotransformation of NA into 6HNA is the first case. This method would be applied to the production of 6HNA as an important starting material of pesticides.
In addition, this method can be successfully applied to the evaluation of the number of NA dehydrogenase in a single cell, where the enzyme immobilized on the column is reduced with NA and after then the reduced enzyme is electrochemically re-oxidized.
Based on a similar principle, NA is bioelectrochemically oxidized at Pseudomonas fluorescens TN-5 cell-immobilized column electrode. The coulometric analysis has allowed highly sensitive and absolute determination of NA down to 0.2 pmol.
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