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DNAコンフォームは,タンデム亜鉛指タンパク質による適応性結合を誘導する
Anamika Patel1, Peng Yang2, Matthew Tinkham2
1Department of Biochemistry, Emory University School of Medicine, 1510 Clifton Road, Atlanta, GA 30322, USA.
Cell
|March 20, 2018
まとめ
亜鉛指 (ZF) タンパク質は遺伝子を調節する. この研究は,ZFP568タンパク質がDNAとどのように相互作用し,哺乳類の発達と進化の洞察を提供することを明らかにしています.
科学分野:
- 分子生物学
- 遺伝学
- 進化生物学
背景:
- タンデム亜鉛指 (ZF) タンパク質は,哺乳類におけるDNA結合トランスクリプションレギュレータの最大かつ最も急速に進化するファミリーを表しています.
- ZFP568は,マウスにおける胎盤特異性インスリン類似成長因子2 (Igf2- P0) 転写の抑制剤として特定されています.
研究 の 目的:
- ZFP568のDNA結合メカニズムを解明する
- ZF-DNAの相互作用の構造的動態と進化的適応性を調査する.
主な方法:
- ZFP568がIgf2-P0より上流にある特定の24塩基対要素に結合する分析.
- ZF-タンパク質結合中のDNAとタンパク質構成の検査
主要な成果:
- ZFP568は11-ZF配列を使用して,Igf2-P0調節要素を結合する.
- 従来のZF-DNA認識からの偏差が観察され,個々のZFは異なる数の塩基 (2-4) と接触し,反対の鎖のチミン認識する.
- AT豊富な配列による軽微な溝の相互作用は,ZF配列の適応性を強調しています.
- 哺乳類の保存にもかかわらず,Igf2とZFP568の変異はチンパンジーとヒトの結合親和性を低下させる.
結論:
- ZF-DNAの相互作用は,配列の変異に適応する形状の柔軟性を示す.
- これらの発見は,哺乳類の発達と進化におけるZF-DNAの相互作用の進化的および構造的基礎に関する重要な洞察を提供します.
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