DNAポリメラーゼ θは,ポリメラーゼとライアゼの活動に共通の活性部位を使用する
Daniel J Laverty1, Ifor P Mortimer1, Marc M Greenberg1
1Department of Chemistry , Johns Hopkins University , 3400 North Charles Street , Baltimore , Maryland 21218 , United States.
Journal of the American Chemical Society
|July 13, 2018
まとめ
DNAポリメラーゼ θ (Pol θ) は,がんにおいて上位調節され,ポリメラーゼとライアゼの両方の活動に不可欠な鍵となるリジン残留物 (Lys2383) を有しており,抗がん薬の開発に潜在的な標的を提供している.
科学分野:
- 生物化学
- 分子生物学
- 癌 研究
背景:
- DNAポリメラーゼ θ (Pol θ) は,がん細胞で上位調節され,酸化損傷抵抗と不良の予後と相関しています.
- Pol θは,ポリメラーゼと,十分に理解されていないライアゼの活動の両方を表している.
- DNA修復と癌の進行におけるその役割は,さらなる調査が必要である.
研究 の 目的:
- 基底部部位におけるPol θのライアス活性を特徴づける.
- Pol θのライアス機能の鍵となる残基を特定する.
- ガン治療のためのPol θの標的化の可能性を調査する.
主な方法:
- 様々な基礎部位におけるポル θ リアーゼの活性を調べる酵素分析.
- 活性部位核フィルを特定するための共性変異研究.
- 酵素機能における作用を評価するために,Lys2383のサイト指向型変異.
主要な成果:
- 酸化した基礎部位 (pC4-AP) を処理しようとすると,Pol θは不活性化されます.
- Lys2383は,ライアス反応におけるシフ塩基形成に不可欠な主要な核性物質として特定された.
- Lys2383の変異は,DNA結合に影響を与えることなく,ポリメラーゼとライアゼの両方の活動を著しく低下させた.
- Pol θは,ポリメラーゼとライアゼ機能の両方に単一の活性サイトを使用します.
結論:
- Lys2383は,Pol θのポリメラーゼとリアゼ活動の両方にとって重要である.
- この残留はPol θの"アキレス・ヒール"を表しています.
- Lys2383をターゲットにすることで 新しい抗がん剤の開発に 有望な戦略が生まれます
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