クリオ-EMを用いた哺乳類のシリアー運動性タンパク質のデノボ識別

Miao Gui¹, Hannah Farley², Priyanka Anujan³

¹Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA.

Cell

|October 29, 2021

まとめ

この研究では,シリアのダブルエット微小管の原子構造を明らかにし,シリア機能に不可欠な新しいタンパク質とメカニズムを明らかにし,関連するヒト疾患を診断するための潜在的な遺伝子を特定しました.

科学分野:

細胞生物学
構造生物学
バイオ物理学

背景:

シリアは細胞の運動と臓器の発達に不可欠です
ダイネインで装飾されたダブルレットマイクロチューブル (DMT) がコアアクソネーム構造を形成する.
微小管内タンパク質 (MIP) は,DMTの組織と機能を調節する.

研究の目的:

哺乳類のDMTの48nm繰り返しの原子構造を決定する.
脊椎動物のに特有の新しいMIPと構造的特徴を特定する.
周期性ブリッジのメカニズムとシリアス運動におけるその役割を解明する.

主な方法:

牛の呼吸器シリアの冷凍電子顕微鏡 (冷凍-EM)
DMT複合体の原子モデル再構築
ゼブラフィッシュとマウスモデルでの遺伝分析

主要な成果:

48nmのDMTの原子モデルが確立された.
以前は知られていなかったMIP,テクチンフィラメント,およびダイネインドッキング複合体が特定されました.
48nmから24nmまでの周期性を橋渡しするメカニズムが発見されました.

結論:

この構造は脊椎動物特有の毛細組織に関する洞察を提供します
特定されたタンパク質の欠陥は,毛細血管の運動能力の低下と横向性の欠陥につながります.
この研究は,シリオパシーの候補遺伝子を特定し,シリヤ機能の理解を助けます.

キーワード:

アクソネマル・ダイネイン毛細血管の運動性シリオパシークリオ・エム二重のマイクロチューブルマイクロチューブル内部のタンパク質

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