MDC1は,哺乳類のDNA損傷応答経路における活性化CHK2と結合している

Zhenkun Lou¹, Katherine Minter-Dykhouse, Xianglin Wu

¹Department of Oncology, Mayo Foundation, Rochester, Minnesota 55905, USA.

Nature

|February 28, 2003

まとめ

DNA損傷チェックポイントタンパク質1 (MDC1) のメディエーターは,DNA損傷反応に不可欠です. そのFHAドメインはCHK2と結合し,DNA修復と細胞サイクルチェックポイントを容易にします.

科学分野:

細胞生物学細胞生物学
分子生物学は分子生物学である.
遺伝学遺伝学とは

背景:

フォークヘッドホモロジー関連ドメイン (FHA) は,酸化モチーフを認識するタンパク質モジュールです.
哺乳類のDNA損傷応答シグナル伝達におけるそれらの役割は完全に理解されていません.

研究の目的:

DNA損傷反応におけるFHAドメインを含むタンパク質MDC1の機能を調査する.
ATM/CHK2経路におけるMDC1の関与のメカニズムを解明する.

主な方法:

DNA断裂におけるMDC1の局所化研究.
MDC1-CHK2関連性を検出するための共免疫プレシピテーションアッセイ.
MDC1発現を抑制するRNA干渉.
DNA損傷後の細胞サイクルチェックポイントとアポトーシスの分析.

主要な成果:

MDC1はDNAの断裂に局所化し,そのFHAドメイン経由で酸化CHK2に結合する.
MDC1はATM/CHK2に依存した方法でリン酸化される.
MDC1抑制は,S相チェックポイントとアポトーシスを損なっており,p53の安定化が損なわれています.
野生型のMDC1は,FHAドメインで削除されたMDC1ではないが,これらの機能を復元する.

結論:

MDC1は,そのFHAドメインを通じてCHK2を活性化するために採用されます.
MDC1は,チェックポイント制御とアポトーシスを含むCHK2媒介のDNA損傷反応において重要な役割を果たします.

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