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脱リン酸化SRp38は,熱ショックへの反応として,スプライシング抑制剤として作用する
Chanseok Shin1, Ying Feng, James L Manley
1Department of Biological Sciences, Columbia University, New York, New York 10027, USA.
Nature
|February 7, 2004
まとめ
熱ショックにより,SRp38タンパク質の脱酸化によってRNAのスプライシングが抑制されます. このストレス反応メカニズムは,SRp38がスプライシング機構を阻害するので,細胞生存に不可欠です.
科学分野:
- 分子生物学は分子生物学である.
- 細胞のストレス反応は,
- 遺伝子発現の規制について
背景:
- 熱ショックのような細胞のストレスが,RNAスプライシングの変化によって遺伝子発現を変化させます.
- 熱ショック時のスプライシング抑制を引き起こす特定の要因は,未だに特定されていない.
- SRp38はSRタンパク質で,スプライシングを抑制し,デフォスフォリレーションによって活性化することが知られている.
研究 の 目的:
- 熱ショックによるスプライシング抑制におけるSRp38の役割を調査する.
- 細胞のストレス中にSRp38がスプライシングを阻害するメカニズムを解明する.
主な方法:
- 熱ショックへの反応としてSRp38の脱酸化を分析する.
- 細胞抽出物でSRp38を細分化して,スプライシングに対する効果を評価する.
- 再構成スプライシング阻害は,非酸化SRp38.3で再構成される.
- デフォスフォリ化SRp38.3のタンパク質相互作用を特定する
- SRp38欠乏細胞における細胞サイクルプロフィールとストレス回復の検討.
主要な成果:
- SRp38の脱酸化は,熱ショック時のスプライシング阻害と相関しています.
- SRp38の枯渇は,熱ショックを受けた細胞抽出物におけるスプライシングを抑制する.
- 脱酸化されたSRp38は,U1 snRNP 5'-splice-site認識に干渉することによってスプライシングを阻害する.
- SRp38欠乏細胞はミトーシス欠陥を示し,熱ショックからの回復が妨げられます.
結論:
- SRp38は,熱ストレス下でのスプライシング抑制の重要なレギュラーです.
- 脱酸化されたSRp38は,スプライソームの組み立てを妨害することによって,スプライシングを阻害する.
- SRp38は,細胞の生存とストレスへの適応に不可欠です.
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