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Elucidating the bottlenech of NADP regeneration in plants

Research Project

Project/Area Number 20K06695
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 44030:Plant molecular biology and physiology-related
Research InstitutionCentral Research Institute of Electric Power Industry

Principal Investigator

Shin-nosuke Hashida  一般財団法人電力中央研究所, サステナブルシステム研究本部, 上席研究員 (60516649)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2021: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
KeywordsNADP+ / NAD+ / NADP+脱リン酸化 / NAD+リン酸化 / ストロマ / pH / NADK / NADPP / NAD / NADP / シロイヌナズナ / 酵素 / タンパク質 / 葉緑体 / 光合成 / 電子受容体
Outline of Research at the Start

光合成において、光によって駆動される電子伝達反応で化学エネルギーを合成するためには、電子受容体である葉緑体NADP補酵素が必要となる。近年、光合成エネルギーバランスを最適化する上で、葉緑体NADP補酵素の量的制御が酸化還元比制御と同様に極めて重要であることが示された。合成経路や増加に寄与する分子メカニズムについては研究が進展しているが、分解経路や減少に寄与する分子メカニズムおよび減少の必然性やその意義に関しては不明な点が多い。本研究では、葉緑体NADP補酵素の減少メカニズムを解明するとともに、その後の再生のボトルネックとなる前駆体供給経路を同定する。

Outline of Final Research Achievements

This study was conducted to elucidate the mechanism of chloroplast NADP+ reduction and to identify the NADP+ regeneration pathway. Investigation of enzymatic properties and metabolic analysis involved in chloroplast NADP+ decrease revealed that NADP+ is converted to NAD+ by NADP+ dephosphorylation (NADPP) after shading. By characterizing the activities of both enzymes involved in the increase and decrease of NADP+, we have discovered an adjustment of chloroplastic NADP+ levels by phosphorylation and dephosphorylation in response to stromal pH conditions. Furthermore, the amino acid sequences of the proteins in the purified active fractions were determined, and the related proteins were identified as novel NADPP enzymes, together with their Arabidopsis mutants.

Academic Significance and Societal Importance of the Research Achievements

光合成の最終電子受容体であるNADP+は光条件によってその量が変動するが、そのメカニズムは不明であり、NADP+とNADPHの総量であるNADPプールサイズの増加と減少の両面からの研究が必要であった。本研究では初めてNADPプールサイズ減少に関わる経路の同定に成功し、光依存性のpH変化に応答してNADPプールサイズが制御されるメカニズムを新たに提唱した。光エネルギーの入力強度に応じて出力が調節される仕組みの一旦が明らかになったことで、NADPプールサイズの調節によって光合成エネルギー収支を最適化できる事が示唆され、最適化に関わる植物育種戦略としても有望である可能性が見出された。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (10 results)

All 2023 2021 2020 Other

All Int'l Joint Research (2 results) Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (5 results) (of which Invited: 1 results)

  • [Int'l Joint Research] INRA(フランス)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] INRA Bordeaux-Aquitaine(フランス)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Loss of chloroplast-localized NAD kinase causes ROS stress in Arabidopsis thaliana2023

    • Author(s)
      Chaomurilege, Yanhui Zu, Atsuko Miyagi, Shin-Nosuke Hashida, Toshiki Ishikawa, Masatoshi Yamaguchi, Maki Kawai-Yamada
    • Journal Title

      Journal of Plant Research

      Volume: 136 Issue: 1 Pages: 97-106

    • DOI

      10.1007/s10265-022-01420-w

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Altered metabolism of chloroplastic NAD kinase-overexpressing Arabidopsis in response to magnesium sulfate supplementation2020

    • Author(s)
      Kawai-Yamada Maki、Miyagi Atsuko、Sato Yuki、Hosoi Yuki、Hashida Shin-Nosuke、Ishikawa Toshiki、Yamaguchi Masatoshi
    • Journal Title

      Plant Signaling & Behavior

      Volume: 16 Issue: 1 Pages: 1844509-1844509

    • DOI

      10.1080/15592324.2020.1844509

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] “NAD World”から見た光合成:電子受容体NADP+はどこから来る?2020

    • Author(s)
      橋田慎之介
    • Journal Title

      光合成研究 (Journal of the Japanese Society of Photosynthesis Research)

      Volume: 30 Pages: 176-187

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Effects of NADP+ dephosphorylation under dark condition on respiratory metabolism in Arabidopsis thaliana2023

    • Author(s)
      橋田慎之介、福田裕介、川合真紀
    • Organizer
      第64回日本植物生理学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Crosstalk between NADP dynamics and photosystem2021

    • Author(s)
      Shin-nosuke Hashida
    • Organizer
      フィンランド―日本 二国間セミナー
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] NADP pool size regulation by light-responsive reversible phosphorylation between NADP+ and NAD+2021

    • Author(s)
      Shin-nosuke Hashida, Yusuke Fukuda, Chinami Ishiyama, Maki Kawai-Yamada
    • Organizer
      日本植物生理学会
    • Related Report
      2021 Research-status Report
  • [Presentation] 葉緑体局在性シロイヌナズナNADキナーゼの機能解析2021

    • Author(s)
      チョモリグ、橋田慎之介、宮城敦子、石川寿樹、山口雅利、川合真紀
    • Organizer
      第62回日本植物生理学会年会
    • Related Report
      2020 Research-status Report
  • [Presentation] 暗馴化過程におけるNADP+減少の遅延は代謝順応に重要な影響を及ぼす2021

    • Author(s)
      橋田慎之介、宮城敦子、川合真紀
    • Organizer
      第62回日本植物生理学会年会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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