ユカリオトのCO2が液体状で,ダイナミックな再編成を示す

Elizabeth S Freeman Rosenzweig¹, Bin Xu², Luis Kuhn Cuellar³

¹Department of Biology, Stanford University, Stanford, CA 94305, USA; Department of Plant Biology, Carnegie Institution for Science, Stanford, CA 94305, USA.

Cell

|September 23, 2017

まとめ

藻類のピレノイドマトリックスは固体ではなく液体であり,分裂と新しい組成によって形成されます. この液体のような臓器細胞の振る舞いは二酸化炭素の固定と遺伝に影響します

科学分野:

細胞生物学
藻類の生物学
バイオ物理学

背景:

ピレノイドは真核藻の重要な有機体であり,世界のCO2の約30%~40%を固定します.
酵素ルビスコが密集しており,伝統的に結晶または無形な固体構造と考えられていた.

研究の目的:

クラミドモナス・ラインハーディのピレノイドマトリックスの物理的状態とバイオゲネシスを調査する.
液体のような臓器細胞の構造,組み立て,遺伝を制御する原理を理解する.

主な方法:

生細胞画像と光顕微鏡でピレノイドの動態を観察する.
段階分離とヘテロ複合体の形成を予測するための生体物理モデル.
ピレノイド分裂とデノボの組み立てプロセスを分析する.

主要な成果:

ピレノイドマトリクスは液体として振る舞い,細胞分裂時に溶解と凝縮を示します.
ピレノイドは既存の構造の分裂と de novo アセンブリの両方によって形成されます.
モデル化により,
マジックナンバー
液体のようなオルガネルの相分離に影響を与えるヘテロ複合体に関連する効果.

結論:

ピレノイドは相分離した液体のようなコンパートメントとして機能し,以前の構造モデルに挑戦しています.
この液体のような性質は,ピレノイドの生殖,調節,遺伝に不可欠です.
この発見は,藻類の臓器構造と機能を理解するための新しいパラダイムを提供します.

キーワード:

CO2を濃縮するメカニズムクラミドモナス・ラインハーティルビスコ生物学的な相変異炭素固定冷凍電子トモグラフィー液体のような臓器マジックナンバーオーガネルの遺伝ピレノイド

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