染色素関連タンパク質H-NSは曲線DNAと相互作用し,DNAトポロジーと遺伝子発現に影響を与える
T A Owen-Hughes1, G D Pavitt, D S Santos
1Imperial Cancer Research Fund, University of Oxford, John Radcliffe Hospital, England.
Cell
|October 16, 1992
まとめ
細菌のタンパク質H-NSは曲線DNAに結合し,遺伝子発現を調節する. この相互作用は,proUプロモーターのオスモレギュレーションに不可欠であり,DNAトポロジーに影響を与えます.
科学分野:
- バクテリアの遺伝学
- 分子生物学は分子生物学である.
- クロマチンの構造は,
背景:
- H-NSのようなヌクレオイド関連タンパク質 (NAP) は,バクテリアに豊富に存在する.
- H-NSはDNAの凝縮に作用し,様々な細胞プロセスを調節する.
- proUプロモーターはオスモス調節され,バクテリアの適応の重要な要因です.
研究 の 目的:
- オスモティックに調節されたproUプロモーターにおけるH-NS作用のメカニズムを解明する.
- H-NS媒介による遺伝子調節におけるDNA曲線の役割を調査する.
- H-NS が vivo で DNA トポロジーをどのように影響するかを理解するために.
主な方法:
- H-NSと曲線DNA要素の相互作用を研究する in vitro.
- luxABとlacZのレポーター遺伝子を利用して,転写パターンを評価する.
- H-NSがプラズミド結合番号に及ぼす影響を in vivoで分析する.
主要な成果:
- 下流の曲線DNA要素とのH-NSの相互作用は,proUプロモーターの調節に不可欠である.
- ヘテロログな曲線DNA配列は,proU曲線を機能的に置き換えることができます.
- H-NSは,in vitroでは,曲線DNA配列に優先的に結合する.
- in vivoのH-NS-DNA相互作用は,プラズミド結合数に影響し,DNAトポロジー制御における役割を果たしていることを示している.
結論:
- DNAの曲線は,H-NSの結合と機能の決定的な決定因子です.
- DNAトポロジーのH-NS媒介の変化は,proUプロモーターのオスモレギュレーションに関与しています.
- この研究は,ニュクレオイド関連タンパク質によるバクテリアの遺伝子調節の分子機構の洞察を提供します.
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