WNKキナーゼは,分子の混雑を感知し,相分離によって細胞容量を救出する

Cary R Boyd-Shiwarski¹, Daniel J Shiwarski², Shawn E Griffiths³

¹Department of Medicine, Renal-Electrolyte Division, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA; Pittsburgh Center for Kidney Research, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA.

Cell

|November 1, 2022

まとめ

脱水した細胞は体積を回復するためにWNKキナーゼを使用します. これらのキナーゼは,相分離によってコンデンサートを形成し,分子混雑下で細胞容量を回復するために信号を放大する.

科学分野:

細胞生物学
生物化学
分子生物学

背景:

細胞の体積の調節は,特に脱水時に生存に不可欠です.
WNKキナーゼはSLC12トランスポーターの体積回復を調節するが,その活性化メカニズムは不明である.

研究の目的:

細胞収縮に反応するWNKキナーゼの活性化メカニズムを解明する.
細胞体積回復におけるWNK1凝縮物形成の役割を調査する.

主な方法:

ハイパートニシティに曝された細胞におけるWNK1の振る舞いを研究した.
分析されたWNK1凝縮物形成と,本質的に乱れたC端への依存性.
WNKキナーゼの活性化における分子混雑の役割を in vivo で調査した.

主要な成果:

WNK1はハイパートニックに反応すると,膜のないコンデンサを素早く形成する.
WNK1の凝縮物形成は,本質的に乱れたC端によって引き起こされる.
分子混雑によって活性化されるコンデンサート形成は,細胞の体積回復のためのシグナル伝達を強化します.

結論:

WNKキナーゼは生理学的混雑センサーとして作用する.
WNK1をコンデンサートに相分離することは,細胞容量の救済を調整する重要なメカニズムです.
このプロセスは,抑制条件にもかかわらず,効率的なイオン輸送と細胞容量の回復を可能にします.

キーワード:

K-Clの共輸送 Na-K-2Clの共輸送 SLC12 コトランスポーター WNKキナーゼバイオ分子凝縮物細胞容量の調節ハイパーオズモティック・ストレスマクロ分子混雑フェーズ分離

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