CDK11は,SF3B1のリン酸化により,mRNA前スプライシングを調節する

Milan Hluchý¹, Pavla Gajdušková¹, Igor Ruiz de Los Mozos^2,3,4

¹Central European Institute of Technology (CEITEC), Masaryk University, Brno, Czech Republic.

Nature

|September 14, 2022

まとめ

スプライソーム活性化における重要なステップであるSF3B1をリン酸化する. OTS964によるCDK11の阻害は,このプロセスを阻害し,イントロンの保持と遺伝子発現の調節を阻害する.

科学分野:

分子生物学
遺伝子発現の規制
RNA 処理

背景:

RNA スプライシングは,スプライセソームによって制御されるプレ-mRNAからイントロンを除去します.
スプライソームの活性化には複雑な再編成が含まれ,重要な制御点です.
活性化時にスプリシングファクター3Bサブユニット1 (SF3B1) をリン酸化するキナーゼは不明でした.

研究の目的:

SF3B1のリン酸化を起こすキナーゼを特定する.
スプライソームの活性化におけるこのリン酸化の役割を調査する.
OTS964がCDK11とスプライソーム機能に及ぼす抑制効果を評価する.

主な方法:

CDK11- SF3B1関連性を示すために共免疫プレシピテーション
SF3B1のリン酸化スレオニン残留を特定するための質量スペクトロメトリー
CDK11阻害の影響を評価するためのインビトロスプライシングアッセイ
スプライソーム複合体の形成 (B から Bact への移行) の分析

主要な成果:

CDK11は,SF3B1と直接結合し,そのN端でリン酸化する.
このリン酸化は,活性化されたスプライソーム (Bact) でのSF3B1とU5およびU6のsnRNAの結合に不可欠である.
選択的なCDK11阻害剤であるOTS964は,SF3B1のリン酸化を阻害し,BからBactへの移行を阻害し,イントロンの保持を引き起こします.

結論:

CDK11は,SF3B1のリン酸化によってスプリセソームの組み立てと活性化に中心的な役割を果たします.
OTS964はCDK11を効果的に抑制し,スプライセソームの活性化を抑制し,広範囲にわたるスプライシング欠陥を引き起こす.
この研究は,RNAスプライシングにおける新たな規制メカニズムと,潜在的な治療標的を特定した.

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