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An analysis of fumarate reductase systems in parasitic helminths and various intermediate molluscan hosts

Research Project

Project/Area Number 61440034
Research Category

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

Allocation TypeSingle-year Grants
Research Field 寄生虫学(含医用動物学)
Research InstitutionJuntendo Uiversity School of Medicine

Principal Investigator

OYA Hiroshi  Juntendo University School of Medicine, 医学部・寄生虫学講座, 教授 (30052939)

Co-Investigator(Kenkyū-buntansha) FURUSHIMA Rieko  Juntendo University School of Medicine, 医学部・寄生虫学講座, 助手 (50146776)
KITA Kiyoshi  Juntendo University School of Medicine, 医学部・寄生虫学講座, 講師 (90134444)
TAKAMIYA Shinzaburo  Juntendo University School of Medicine, 医学部・寄生虫学講座, 講師 (90138206)
Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥14,600,000 (Direct Cost: ¥14,600,000)
Fiscal Year 1987: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1986: ¥12,600,000 (Direct Cost: ¥12,600,000)
KeywordsFumarate reductase system / PEPCK-succinate pathway / environmental adaptation / Ascaris / Paragonimus / Oncomelania / Biomphalaria / 電子伝達系 / 嫌気的エネルギー代謝 / ミトコンドリア / 複合体【II】 / フマル酸還元酵素 / 高速液体クロマトグラフ / チトクロム
Research Abstract

Some parasitic helminths and aquatic molluscs utilize glucose mainly through a phosphoenol-pyruvate carboxykinase(PEPCK)-succinate pathway; an alternative pathway of the carbohydrate metabolism with succinate as one of the resulting end-products. The terminal step of the pathway is a fumaratereducing reaction, which is catalyzed by mitochondrial electron transport enzymes and where fumarate functions as an electron acceptor. The fumarate reductase system produces ATP.
In this project, fumarate reductase systems of Ascaris suum, Paragonimus westermani and molluscan intermediate hosts, which inhabit in various environments, were comparatively studied to understand their physiological significance. Previous study in our laboratory showed that a type b cytochrome, which can be distiguished from b cytochromes in complex III, participated in the fumarate reductase system in Ascaris and Paragonimus adult mitochondria. In the course of the project, the b-type cytochrome, b_<558> for Ascaris or … More b_<556> for Paragonimus, was found to be localized in complex II of the worm respiratory chain after the procedure for isolation of complex II had been established. The midpoint oxidation-reduction potential (Em) of Ascaris cytochrome b_<558> was - 34 mV. A similar b-type cytochrome exists in complex II of beef heart mitochondria though its Em is more negative (-185 mV). The b-type cytochrome in parasite complex II was easily reduced by succinate but it was not the case in beef heart complex II. Complexes II, of Ascaris and Paragonimus, were composed of four subunits like beef heart one. Studies using high performance liquid chromatography showed Ascaris cytochrome b_<558> tocorrespond to the two smaller subunits. Molecular properties of the largest subunit of complex II were similar among all three species and their immunological homology was high. However, the two smaller subunits had different properties with negligible immunological homology. Ascaris complex II had a high fumarate reductase activity. Also, an NADH-fumarate reductase activity was reconstituted with beef heart complex I, Ascaris complex II and rhodoquinone, indicating the quinone to be an essential component of the NADH-fumarate reductase system. As to studies on intermediate molluscan hosts, anaerobic immersion experiments, which were performed in the presence of molluscicides and followed by analyses of organic acids, showed the PEPCK-succinate pathway to be in function in vivo in Oncomelania nosophora and Biomphalaria glabrata snails. Less

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] TAKAMIYA,Shinzaburo: Biochim. Biophys. Acta. 848. 99-107 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] MA, Yu-Chang: Jpn. J. Parasitol.36. 107-117 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] KITA,Kiyoshi: Comp. Biochem. Physiol.89B. 31-34 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 北,潔: 神経研究の進歩. 31. 592-603 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] KITA,Kiyoshi: Biochim. Biophys. Acta.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] OYA,Hiroshi: "The comparative biochemistry of parasitic helminths" Pergamon Press,

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] TAKAMIYA, Shinzaburo: "Electron-transfer complexes of Ascaris suum muscle mitochondria. II. Succinate-coenzyme Q reductase (complex II) associated with substrate-reducible cytochrome b-558." Biochim. Biophys. Acta. 848. 99-107 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] MA, Yu-Chang: "Isolation and properties of complex II (succinate-ubiquinone reductase) in the mitochondria of Paragonimus westermani." Jpn. J. Parasitol.36. 107-117 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] KITA, Kiyoshi: "Gene expression, assembly and abnormality of the components in the mitochondrial electron transport system.(in Japanese)." Shinkei Kenkyu no Shinpo. 31. 592-603 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] KITA,Kiyoshi: "Complex II is a major component of the respiratory chain in the muscle mitochondria of Ascaris suum with high fumarate reductase activity." Comp. Biochem. Physiol.89B. 31-34 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] KITA, Kiyoshi: "Properties of complex II as fumarate reductase in the respiratory chain of muscle mitochondria of Ascaris suum, and reconstitution of NADH-fumarate reductase activity." Biochim. Biophys. Acta.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] OYA, Hiroshi: The comparative biochemistry of parasitic helminths. Pergamon Press,

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yu-Cang Ma: Japanese Journal of Parasitology. 36. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] Kiyoshi Kita: Comparative Biochemistry and Physiology.

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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