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X-ray-based Real-space imaging of molecular motion of proteins in insect flight muscle

Research Project

Project/Area Number 19K06777
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 44050:Animal physiological chemistry, physiology and behavioral biology-related
Research InstitutionJapan Synchrotron Radiation Research Institute

Principal Investigator

Iwamoto Hiroyuki  公益財団法人高輝度光科学研究センター, 散乱・イメージング推進室, 客員研究員 (60176568)

Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
KeywordsX線回折 / シンクロトロン放射光 / 昆虫飛翔筋
Outline of Research at the Start

近年、X線回折像から試料の実像を復元するアルゴリズムが非常に進歩しており、主に単粒子のイメージングに応用されている。これを従来型のX線回折実験、特に本研究が該当する「X線繊維回折」という分野に適用することを試みる。試みるアルゴリズムとしては繰り返し計算法(オーバーサンプリング法)とホログラム法である。主な試料として、昆虫飛翔筋を用いる。これらの方法を用い、最終的には動作している昆虫飛翔筋内で、運動タンパクであるミオシンが動く様子を可視化することを目標とする。

Outline of Final Research Achievements

Two methods were developed to perform the 3-D imaging of the molecular arrangement within insect flight muscle by means of X-ray diffraction. The first one is the cylindrically averaged Patterson function method. This is an original method developed by the principal investigator. By using this method, I clarified the structure of the myosin filament in bumblebee flight muscle. The second one is the iterative calculation (oversampling) method. This is a 3-D expansion of the commonly used 2-D calculation, aimed to restore the 3-D structure of an object from is rotationally averaged 2-D diffraction pattern. By using this method, the 3-D structure of the filament lattice model of insect flight muscle was well restored from its calculated rotationally averaged diffraction pattern.

Academic Significance and Societal Importance of the Research Achievements

X線回折法は、用いるX線の波長が原子のサイズと同じレベルであることから、原子分解能の構造決定手段として優れた方法である。しかし、固有の問題として、構造復元に必要な振幅と位相のうち、位相情報が検出器で記録する際に失われてしまうという問題がある。このため、従来、特に結晶性の低い試料でX線回折法により3次元構造を決定するのが難しかった。本研究では2つの方法により失われた位相情報を回復し、回転平均化された回折像しか得られない試料であっても3次元構造を実空間で復元できることを明らかにした。これは今回対象とした昆虫飛翔筋のみならず、材料科学方面にも適用できるきわめて有益なものと考えられる。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (12 results)

All 2022 2021 2020 2019 Other

All Int'l Joint Research (2 results) Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 3 results) Presentation (6 results) (of which Int'l Joint Research: 1 results)

  • [Int'l Joint Research] Florida State University(米国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Florida State University(米国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Structure of the Flight Muscle Thick Filament from the Bumble Bee, Bombus ignitus, at 6 angstrom Resolution2022

    • Author(s)
      Li Jiawei、Rahmani Hamidreza、Abbasi Yeganeh Fatemeh、Rastegarpouyani Hosna、Taylor Dianne W.、Wood Neil B.、Previs Michael J.、Iwamoto Hiroyuki、Taylor Kenneth A.
    • Journal Title

      International Journal of Molecular Sciences

      Volume: 24 Issue: 1 Pages: 377-377

    • DOI

      10.3390/ijms24010377

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The 3D structure of fibrous material is fully restorable from its X-ray diffraction pattern2021

    • Author(s)
      Iwamoto Hiroyuki
    • Journal Title

      IUCrJ

      Volume: 8 Issue: 4 Pages: 544-548

    • DOI

      10.1107/s2052252521004760

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] The 3-D structure of fibrous material is fully restorable from its X-ray diffraction pattern2021

    • Author(s)
      Iwamoto Hiroyuki
    • Journal Title

      bioRxiv

      Volume: - Pages: 1-21

    • DOI

      10.1101/2021.02.09.430379

    • Related Report
      2020 Research-status Report
    • Open Access
  • [Journal Article] Synchrotron radiation X-ray diffraction studies on muscle: past, present, and future2019

    • Author(s)
      Iwamoto Hiroyuki
    • Journal Title

      Biophysical Reviews

      Volume: 11 Issue: 4 Pages: 547-558

    • DOI

      10.1007/s12551-019-00554-x

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] RECONSTRUCTION OF REAL-SPACE 3-D STRUCTURE FROM X-RAY FIBER DIFFRACTION PATTERN: APPLICATION TO MUSCLE PROTEIN FILAMENTS2020

    • Author(s)
      H. Iwamoto
    • Organizer
      Biophysical Society (USA)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] X線繊維回折から試料の3次元構造を復元する方法2020

    • Author(s)
      岩本裕之
    • Organizer
      2020年 生体運動合同班会議
    • Related Report
      2019 Research-status Report
  • [Presentation] Synchrotron radiation X-ray diffraction reveals the highly ordered structure of axonemes in the comb plate of ctenophores2019

    • Author(s)
      H. Iwamoto
    • Organizer
      日本生物物理学会
    • Related Report
      2019 Research-status Report
  • [Presentation] Recent progress in synchrotron radiation X-ray diffraction studies for non-crystalline biological specimens2019

    • Author(s)
      H. Iwamoto
    • Organizer
      日本生物物理学会
    • Related Report
      2019 Research-status Report
  • [Presentation] クシクラゲの櫛板は繊毛でできた巨大単結晶である2019

    • Author(s)
      岩本裕之
    • Organizer
      日本動物学会
    • Related Report
      2019 Research-status Report
  • [Presentation] X線回折イメージングはどこまで動物学に応用できるか2019

    • Author(s)
      岩本裕之
    • Organizer
      日本動物学会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2025-01-30  

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