SIRT2はヒストンの4-オクソンナノイルリシン変化を逆転させる
Jing Jin1, Bin He2, Xiaoyu Zhang3
1School of Biomedical Science, University of Hong Kong , Hong Kong, China.
Journal of the American Chemical Society
|September 10, 2016
まとめ
哺乳類のSIRT2は,酸化ストレス反応を理解するために不可欠な,新たに発見されたヒストンの改変であるライシン4オキシノナニル化 (4-ONylation) を除去する.
科学分野:
- 生物化学
- 分子生物学
- 細胞生物学
背景:
- 翻訳後の改変 (PTM) は,タンパク質の機能と生物学的プロセスにとって不可欠です.
- リシン4-オクソナニル化 (4-ONylation) は,酸化ストレス中に核細胞組成を阻害するヒストンPTMである.
- 4-ONylationの逆転に責任を負う酵素は未特定であり,細胞の役割に関する研究を制限しています.
研究 の 目的:
- ヒストンから4-ONyl変異を除去できる細胞酵素を特定する.
- 4-ONylationが逆転するメカニズムを解明する.
- 酸化ストレスと4-ONylationにおけるSIRT2の役割を理解する.
主な方法:
- 4-ONYlatedタンパク質のSIRT2活性をテストするインビトロアッセイ
- 4-ONylペプチドとの複合体におけるSIRT2の結晶構造の決定.
- 4-ONylation除去におけるSIRT2の役割を検証する細胞実験.
主要な成果:
- 哺乳類のSIRT2は,生細胞のヒストンおよび他のタンパク質から4-ONyl変異を除去する酵素として特定されました.
- 結晶構造は,Phe119と4-ONylグループのケトン酸素の間の鍵となる単一対π相互作用を明らかにした.
- この研究は,4-ONylライシン改変を逆転させるメカニズムの最初の証拠を提供します.
結論:
- SIRT2はライシン4-オクソナニル化を逆転させる上で重要な役割を果たします.
- この発見は,酸化ストレス反応経路におけるSIRT2の機能についての洞察を提供します.
- この研究は,4-ONylationの生物学的意義に関するさらなる調査を容易にする.
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