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A novel alginate-assimilating pathway in abalone that feeds on brown seaweeds

Research Project

Project/Area Number 16K07864
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Aquatic life science
Research InstitutionHokkaido University

Principal Investigator

Ojima Takao  北海道大学, 水産科学研究院, 教授 (30160865)

Co-Investigator(Kenkyū-buntansha) 井上 晶  北海道大学, 水産科学研究院, 准教授 (70396307)
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywordsアワビ / 藻食性 / 腹足類 / アルギン酸 / ウロン酸 / 代謝 / 酵素 / 解糖系 / アルギン酸リアーゼ / DEH / KDG / 還元酵素 / アルドラーゼ / DEH還元酵素 / KDGアルドラーゼ / 代謝酵素 / アメフラシ / タマキビガイ / 糖質代謝 / 代謝系酵素
Outline of Final Research Achievements

Herbivorous marine gastropods such as abalone and sea hare are considered to assimilate seaweed alginate using a specific alginate-metabolic enzymes. However, these enzymes had not been identified yet. In the present study, we investigated the alginate-assimilating enzymes of abalone, and have successfully identified an unsaturated alfa-keto acid (DEH) reducing enzyme HdRed and an alfa-keto-deoxygluconate (KDG) aldolase HdAld. These enzymes along with alginate lyases HdAly and HdAlex, which were previously identified by us, are considered to form an alginate-degrading and assimilating pathway as follows. 1) Alginate is degraded to DEH by HdAly and HdAlex. 2) DEH is reduced to KDG by HdRed. 3) KDG is split to pyruvate (PA) and glyceraldehyde (GA) by HdAld. 4) The thus resulted PA and GA are converted to acetyl CoA and assimilated by TCA cycle. This metabolic pathway was considered to distribute over many herbivorous gastropods.

Academic Significance and Societal Importance of the Research Achievements

動物の解糖系としてエムデン・マイヤホフ経路がよく知られているが、この経路では褐藻のアルギン酸(ウロン酸)は代謝できない。そのため、褐藻を摂餌するアワビがどのような代謝経路でアルギン酸を栄養源としているのかは長年不明であった。申請者らは、アワビのアルギン酸代謝を可能とする酵素系を研究し、ウロン酸をピルビン酸とグリセルアルデヒドに代謝する新規の代謝経路の存在を明らかにした。この代謝系は、アワビだけでなく他の藻食性腹足類にも存在していると考えられ、藻食性腹足類がアルギン酸を栄養源として利用可能であることを新しい酵素反応系の存在により示し、長年の問題を解決した点で学術的意義が大きい。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (8 results)

All 2019 2018 2017

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (5 results) Book (1 results)

  • [Journal Article] Polysaccharide-Degrading Enzymes From Marine Gastropods2018

    • Author(s)
      Ojima, T., Rahman, MM., Kumagai, Y., Nishiyama, R., Narsico, J., and Inoue, A.
    • Journal Title

      Methods in Enzymology

      Volume: 605 Pages: 457-497

    • DOI

      10.1016/bs.mie.2018.01.032

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Structure and polymannuronate specificity of a eukaryotic member of the polysaccharide lyase family 142017

    • Author(s)
      H-M. Qin, T. Miyakawa, A. Inoue, R. Nishiyama, A. Nakamura, A. Asano, Y. Sawano, T. Ojima, M. Tanokura
    • Journal Title

      J. Biol. Chem.

      Volume: 292 Issue: 6 Pages: 2182-2190

    • DOI

      10.1074/jbc.m116.749929

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] エゾアワビにおけるアルギン酸由来α-ケト酸の代謝機構2018

    • Author(s)
      西山竜士、井上晶、尾島孝男
    • Organizer
      マリンバイオテクノロジー学会
    • Related Report
      2018 Annual Research Report
  • [Presentation] アルギン酸の分解・代謝酵素2018

    • Author(s)
      尾島孝男
    • Organizer
      日本水産学会
    • Related Report
      2018 Annual Research Report
  • [Presentation] エゾアワビのアルギン酸代謝アルドラーゼHdAldの同定2017

    • Author(s)
      西山竜士・井上晶・尾島孝男
    • Organizer
      平成29年度日本水産学会春季大会口頭発表
    • Place of Presentation
      東京海洋大学(東京都港区)
    • Year and Date
      2017-03-27
    • Related Report
      2016 Research-status Report
  • [Presentation] アルギン酸分解・代謝酵素2017

    • Author(s)
      尾島孝男
    • Organizer
      平成29年度日本水産学会春季大会シンポジウム
    • Place of Presentation
      東京海洋大学(東京都港区)
    • Year and Date
      2017-03-26
    • Related Report
      2016 Research-status Report
  • [Presentation] エゾアワビにおけるアルギン酸由来α-ケト酸の代謝機構2017

    • Author(s)
      西山竜士・井上晶・尾島孝男
    • Organizer
      マリンバイオテクノロジー学会(東北大学青葉台キャンパス)
    • Related Report
      2017 Research-status Report
  • [Book] Enzymatic Technologies for Marine Polysaccharides. Chapter 22. Production of value-added materials from alginate by using alginate-degrading and assimilating enzymes2019

    • Author(s)
      Ojima, T., Nishiyama, R., and Inoue, A.
    • Total Pages
      16
    • Publisher
      CRC Press, Taylor and Francis group, USA
    • Related Report
      2018 Annual Research Report

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Published: 2016-04-21   Modified: 2020-03-30  

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