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Development of the method for polychlorinated biphenyl treatment by the combination of physicochemical and biological degradation

Research Project

Project/Area Number 05454612
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 環境保全
Research InstitutionNagaoka University of Technology

Principal Investigator

YANO Keiji  Nagaoka Univ.Tech., Dept.BioEngineering, Professor, 工学部, 教授 (10011842)

Co-Investigator(Kenkyū-buntansha) KIMBARA Kazuhide  Nagaoka Univ.Tech., Dept.BioEngineering, Assistant Professor, 工学部, 講師 (30225122)
FUKUDA Masao  Nagaoka Univ.Tech., Dept.BioEngineering, Associate Professor, 工学部, 助教授 (20134512)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥7,100,000 (Direct Cost: ¥7,100,000)
Fiscal Year 1994: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1993: ¥6,100,000 (Direct Cost: ¥6,100,000)
KeywordsPCB / Chimeric enzymes / Site-directed mutagenesis / Conjugation / Ultraviolet treatment / 分解系遺伝子 / クローニング / 物理化学的処理法
Research Abstract

In this research project, we analyzed the structure of PCB degradation enzymes and discussed about their reaction mechanism. The biphenyl dioxygenase (BphA) and 2,3-dihydroxybiphenyl dioxygenase (BphC) were selected for these experiments. Chimeric genes were constructed with the combination between benzene degradation genes and the resulted chimeric enzymes suggested that the amino acid differences of enzymes responsible for the differences of substrate specificity. We could also create the mutated enzymes that had different specificity for substrates.
To construct a genetically manipulated microorganism, we had introduced the PCB degradation genes to soil bacteria. The conjugants showed biphenyl degradation activity and this ability was inducible by biphenyl.
The PCB solution was treated by ultraviolet (UV) irradiation and the dechlorination of PCBs was analyzed by GC-MS.The UV-treated PCB solution was used for the biological treatment and the PCBs were completely degraded by these combination.
From our experiments, we concluded that few amino acid differences of degradation enzymes effect to the substrate specificity and the UV-treatment is very useful for the complete degradation of PCBs.

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report

URL: 

Published: 1993-04-01   Modified: 2016-04-21  

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