ATMは,DNA損傷後のE3ユビキチンリガゼCOP1の自己分解を誘発する
David Dornan1, Harumi Shimizu, Angie Mah
1Department of Physiological Chemistry, Genentech, Inc., 1 DNA Way, South San Francisco, CA 94080, USA.
まとめ
アタクシア・テランジエクタシア変異 (ATM) タンパク質キナーゼは,DNA損傷後のCOP1-p53軸を調節する. 387) のCOP1のATMリン酸化によりCOP1-p53結合が妨げられ,p53とその腫瘍抑制機能が安定する.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
背景:
- アタクシア・テランジエクタシア変異 (ATM) タンパク質キナーゼは,DNA損傷反応とゲノム整合性にとって極めて重要です.
- 腫瘍抑制タンパク質p53の安定性は,COP1を含むE3ユビキチンリガゼによって調節されるが,ATM調節経路は不明である.
研究 の 目的:
- DNA損傷後のCOP1-p53軸を調節する信号伝導経路を解明する.
- COP1およびp53の規制におけるATMの役割を調査する.
主な方法:
- ATM,COP1,p53の相互作用と局所化に対するDNA損傷の影響を研究した.
- DNAの損傷を誘発するために電離放射線を活用し,SerでCOP1リン酸化を分析した (387).
主要な成果:
- ATMは,DNAの損傷に対する反応として,セル387上のCOP1をリン酸化し,COP1の自己分解を誘発する.
- 離子放射線は,ATMに依存するCOP1.1の核から細胞質への転移を誘導する.
- ATMによるセール387のCOP1のリン酸化は,COP1-p53複合体を破壊し,p53のユビキチン化と分解を防ぐ.
結論:
- セル387のCOP1のATM依存型リン酸化は,p53の安定化とDNA損傷後の腫瘍抑制活性に不可欠である.
- この経路は,ゲノムストレスの反応としてp53機能を調節する新しいメカニズムを表しています.
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