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2019 Fiscal Year Final Research Report

Motile mechanism of axonemal dynein studied using the dynein-microtubule-DNA-origami complex

Research Project

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Project/Area Number 16K07332
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Biophysics
Research InstitutionNational Institute of Advanced Industrial Science and Technology

Principal Investigator

Hirose Keiko  国立研究開発法人産業技術総合研究所, 生命工学領域, 主任研究員 (90357872)

Project Period (FY) 2016-10-21 – 2020-03-31
Keywordsダイニン / 微小管 / 鞭毛・繊毛 / DNA折り紙 / ナノ計測
Outline of Final Research Achievements

In order to understand the regulatory mechanism of the periodic bending movement of cilia and flagella, we constructed a model system consisting of axonemal outer arm dyneins, microtubules, and DNA origami structures. Electron microscopic observation revealed that the complex has a structure in which dyneins are regularly arranged in two opposite orientations between two microtubules crosslinked by DNA origami. In optical trapping experiments, the complex showed back and forth movement. These results showed that a simple system composed of dynein, microtubules, and crosslinkers has an ability to move in a self-oscillatory manner.

Free Research Field

生物物理学

Academic Significance and Societal Importance of the Research Achievements

鞭毛・繊毛の周期的屈曲運動のためには、鞭毛・繊毛軸糸の逆側に配置したダイニンが交互に活性化する必要があるが、これがダイニン・微小管に固有の性質によるのか、鞭毛内に多数存在する他の制御蛋白質や鞭毛・繊毛の特徴的な立体構造によるのかは不明であった。本研究では、DNA折り紙構造体を用いることにより、軸糸ダイニン、微小管、架橋構造から成る単純な系が自律振動的に運動することを示し、鞭毛・繊毛運動の制御機構を理解するうえで重要な知見を得ることができた。

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Published: 2021-02-19  

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