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Development of utilization of lipid containing polyunsaturated fatty acids produced by microbes.

Research Project

Project/Area Number 08455384
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 生物・生体工学
Research InstitutionHIROSHIMA UNIVERSITY

Principal Investigator

SUZUKI Osamu  Hiroshima University, Faculty of Engineering, Professor, 工学部, 教授 (00274126)

Co-Investigator(Kenkyū-buntansha) AKI Tsunehiro  Hiroshima University, Faculty of Engineering, Research Associate, 工学部, 助手 (80284165)
SHIGETA Seiko  Hiroshima University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (10034381)
ONO Kazuhisa  Hiroshima University, Faculty of Engineering, Professor, 工学部, 教授 (10144883)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥7,800,000 (Direct Cost: ¥7,800,000)
Fiscal Year 1997: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1996: ¥4,300,000 (Direct Cost: ¥4,300,000)
KeywordsPolyunsaturated fatty acid / Docosahexaenoic acid / Arachidonic acid / DELTA6 Desaturase / Allergy / Lipid / ドコサヘキサン酸 / Schizochytrium sp. / トリアシルグリセロール / 血漿脂質 / リン脂質
Research Abstract

An isolated fungus Mortierella alliacea YN-15 had a capable of producing 3.9 g/L of arachidonic acid in a flask and 5.0 g/L in a jar fermentor. This strain could metabolize soluble starch as well as glucose. We isolated another arachidonic acid producing microbe Achlya sp.ma-2801 which also contained a significant amout of eicosapentaenoic acid in the cell. Eight stains of microbes producing docosahexaenoic acid were isolated from the sea and one of them, by cultivation in a jar fermentor, appeared to contain high amount of phospholipids consisted of docosahexaenoic acid. A mutant strain MS14-13 that produced higher level of docosahexaenoic acid was isolated from a strain Schizochytrium sp.SR21. The mutant showed higher content of docosahexaenoic acid in total fatty acid than of wild type strain. A gene encoding delta-6 desaturase has been cloned from blue algae and expressed functionally in yeast resulting a successful conversion of exogenious linoleic acid into gamma-linolenic acid.
We found, in analyzes of serum fatty acid compositions of allergic patients, RAST value of indivisual patients had a positive correlation with linoleic acid content in their plasma lipid, suggesting the depressed activity of delta-6 desaturase in allergic patients.
It is considered that the manipulation of multi-enzyme system of fatty acid desaturation and chain elongation is neccessary for breeding of microbes producing polyunsaturated fatty acids. Isolation of mutants defective in desaturase enzymes and/or cloning of genes coding for such enzymes would be indispensable.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] Fujii S: "Identification of T cell epitope sequences on an imptant mite antigen." Clinical and Experimental Allergy. 27. 1086-1094 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Fujii: "Identification of T cell epitope sequences on an important mite antigen." Clinical and Experimental Allergy. 27. 1086-1094 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Fujii S: "Identification of T cell epitope Sequences on an impotant mite antigen." Clinical and Experimental Allergy. 27. 1086-1094 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] I. Ida, T. Nakahara, et al.: "Improvment of Docosahexaenoic acid Production in a Culturer of Traustochytrium aureum by Medium Optimization" J. Ferment. Bioeng.81 (1). 76-78 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] O. Hiruta, Y. Kamisaka, et al.: "γ-Linoleic Acid Produotion by a Low Temperature Resistant Mutant of Nortierella oamaniana." J. Ferment. Bioeng.82 (1). 119-123 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] O. Hiruta, Y. Kamisaka et al.: "Optimization and Scole-up of γ-Linoleic Acid Production by Mortierella ramaniona MM15-1, High γ-Lincleic Acid Production Mutmut" J. Ferment. Bioeng.82 (4). 366-370 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] S. Fujii, K. Ono et al.: "B cell Mitogenic Activity of House Dust Mire, Dermatophagotdes torinue, Antigens." Immunology Letters. 49. 37-42 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] O. Suzuki, et al.: "Production of hipid by Mictoorganisms, Industrial Application of singl & Coll Oils" Proceedings of the 1996 PORIM International Palin Oil Congress,. 1996. (103-113)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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