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The Structure and Biosynthetic Mechanism of the Monomolecular Membrane made of Tetraether Type of Polar Lipids in Methan Menic Bacteria

Research Project

Project/Area Number 01560108
Research Category

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

Allocation TypeSingle-year Grants
Research Field 応用生物化学・栄養化学
Research InstitutionUniversity of Occupational and Environmental Health, Japan

Principal Investigator

KOGA Yosuke  University of Occupational and Environmental Health, Japan Department of Chemistry, Professor, 医学部, 教授 (70012458)

Co-Investigator(Kenkyū-buntansha) MORII Hiroyuki  University of Occupational and Environmental Health, Japan Department of Chemist, 医療技術短期大学, 助手 (60141743)
NISHIHARA Masateru  University of Occupational and Environmental Health, Japan Department of Chemist, 医学部, 講師 (20131930)
Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1990: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1989: ¥1,600,000 (Direct Cost: ¥1,600,000)
Keywordsmethanogenic bacteria / archaebacteria / ether lipid / cell membrane / protoplast / cell wall-degrading enzyme / amino lipid / orientation of lipids
Research Abstract

A pseudomurein-degrading enzyme from Methanobacterium wolfei autolyzate was partially puried to prepare protoplasts of Methanobacterium thermoautotrophicum. An improved assay method of the enzyme using purified cell walls of M. Thermoautotrophicum as a substrate made it possible to determine the enzyme activity quantitatively and to characterize its properties. The optimum pH and temperature were 6.8 - 7.4 and 75 ^゚C, respectively. Incubation of this enzyme in the absence of the substrate cell walls at 70 ^゚C for 10 min caused loss of half of the activity and heating at 85 ^゚C for 10 min inactivated it completely. However, the enzyme activity was recovered more or less by the incubation with the substrate at 62^゚C for14 hr even after heat treatment at 100^゚C for 30 min. Although the pseudomurein-degrading enzyme was oxygen-sensitive (active only under the anoxic condition), it was also active after storage in the presence of air without reducing agents if it was assayed under the anoxi … More c condition. On the basis of this property the enzyme was able to be purified under normal conditions in the presence of air. Intact cells, protoplasts, and vesicles prepared by passing of a French-pressure cell, of M. Thermoautotrophicum were reacted with trinitrobenzene sulfonic acid and total lipid was extracted. The trinitrophenylated amino lipids and the unreacted lipids were separated by use of thin-layer chromatography and percentage of trinitrophenylation was determined by phosphorus measurement. The vesicles prepared with a French-pressure cell is believed to be inside-out. Archaeitidylethanolamine was almost equally distributed between innerand outer leaflets of the membrane. Approximately 20 % of the amino group of gentiobiosyl caldarchaetidylethanolamine (tetraether type of phosphoglycolipid) oriented to the outside of the membrane. Most (90 %) of the amino groups of archaetidylserine and gentiobisyl caldarchaetidylserine were distributed inner leaflet. This gave another line of evidence for the heptad hypothesis which postulated that tetraether polar lipids were synthesized from diether polar lipids in the membrane without reorientation of those lipids. Less

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] Nishihara,M.and Koga,Y.: "Natural occurrence of archaetidic acid and caldarchaetidic acid (diーand tetraーether analogues of phosphatidic acid) in the archaebacterium Methanobacterium thermoautotrophicum" Biochemistry and Cell Biology. 68. 91-95 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 西原 正照・古賀 洋介: "古細菌のエ-テル型脂質ー構造の特徴と生合成ー" 化学と生物. 28. 288-294 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 古賀 洋介: "古細菌細胞表層の特徴" Cell Science. 6. 218-221 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Nishihara,M.and Koga,Y.: "Hydroxyarchaetidylserine and hydroxyarchaetidylーmyoーinositol in Methanosarcina barkeri:polar lipids with a new ether core portion" Biochimica et Biophysica Acta. (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Morii,H.and Koga,Y.: "A pseudomureinーdegrading enzyme from Methanobacterium wolfei. An improved assay method and some properties." Journal of Fermentation and Bioengineering.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Nishihara, M. and Koga, Y.: "Natural occurrence of archaetidic acid and caldarchaetidic acid (di- and tetra-ether analogues of phosphatidic acid) in the archaebacterium Methanobacterium thermoautotrophicum" Biochemistry Cell Biology. 68. 91-95 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Nishihara, M. and Koga, Y.: "Hydroxyarchaetidylserine and hydroxyarchaetidyl-myo-inositol in Methano-sarcina barkeri : polar lipids with a new ether core portion." Biochimica Biophysica Acta.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Morii, H. and Koga, Y.: "A pseudomurein-degrading enzyme from Methanobacterium wolfei. An improved assay method and some properties." Journal of Fermentation and Bioengineering.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Nishihara,M.and Koga,Y.: "Natural occurrence of archaetidic acid and caldarchaetidic acid (diーand tetraーether analogues of phosphatidic acid) in the archaebacterium Methanobacterium thermoautotrophicum" Biochemistry and Cell Biology. 68. 91-95 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 西原 正照・古賀 洋介: "古細菌のエ-テル型脂質ー構造の特徴と生合成ー" 化学と生物. 28. 288-294 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 古賀 洋介: "古細菌細胞表層の特徴" Cell Science. 6. 218-221 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Nishihara,M.and Koga,Y.: "Hydroxyarchaetidylserine and hydroxyarchaetidylーmyoーinositol in Methanosarcina barkeri:polar lipids with a new ether core portion." Biochimica et Biophysica Acta. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] Morii,H.and Koga,Y.: "A pseudomureinーdegrading enzyme from Methanobocterium wolfei.An improved assay method and some properties." Journal of Fermentation and Bioengineering.

    • Related Report
      1990 Annual Research Report
  • [Publications] M.Nishihara and Y.Koga: "Natural Occurrence of Archaitidic Acid and Caldarihar tidic acid(Diーand Tetraーether Aralognes of Phosphatidic Acid)in the Arohae bacterium Methano bacterium thermoauto trophicum" Biochemistry and Cell Biology. 68. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 西原正照・古賀洋介: "古細菌のエ-テル型脂質ー構造の特徴と生合成ー" 化学と生物. 28. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 古賀洋介,他: "極限環境微生物ハンドブック" サイエンスフォ-ラム社, (1990)

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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