ニューロスポラSETドメインタンパク質DIM-5の構造,ヒストンH3ライシンメチルトランスフェラーゼ
Xing Zhang1, Hisashi Tamaru, Seema I Khan
1Department of Biochemistry, School of Medicine, Emory University, 1510 Clifton Road, Atlanta, GA 30322, USA.
Cell
|October 10, 2002
まとめ
研究者らは,ヒストンメチルトランスフェラーゼであるニューロスポラDIM-5の結晶構造を決定した. この発見は,ヒストンのコードと遺伝子発現の調節に関する洞察を提供します.
科学分野:
- バイオケミストリー バイオケミストリー
- 構造生物学 構造生物学とは
- エピジェネティクス エピジェネティクス
背景:
- AdoMet依存酵素によって制御されるヒストンのメチル化は,ヒストンのコードの重要な構成要素であり,遺伝子発現に影響を与えます.
- ヒストンメチルトランスフェラーゼ (HKMTs) は,表遺伝子調節において重要な役割を果たします.
研究 の 目的:
- ヒストンH3ライシン9メチル化の構造的基礎を明らかにするために,ニューロスポラDIM-5の結晶構造を決定する.
- メチル転移のメカニズムと,HKMTsにおけるSETドメインの機能を理解する.
主な方法:
- ニューロスポラDIM-5の3D構造を1.98A解像度で決定するためのX線結晶学.
- 主要な残留物の生化学的特徴とサイト指向型変異発生.
主要な成果:
- Neurospora DIM-5の結晶構造が決定され,他のAdoMet依存メチルトランスファーゼと異なるユニークな折り目を明らかにしました.
- SETドメイン前における新しいZn3Cys9亜鉛クラスターと,SETドメイン内のAdoMet結合部位の特定.
結論:
- 決定された構造は,ヒストンメチル化のためのメカニズムモデルを提供します.
- この構造情報は,HKMTファミリーおよびSETドメインタンパク質のさらなる機能研究のための基礎として機能します.
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