ホモログ的再結合中の枝移転:RuvAB-ホリデー結合複合体の組み立て in vitro

K Hiom¹, S C West

¹Imperial Cancer Research Fund, Clare Hall Laboratories, South Mimms, Hertfordshire, England.

Cell

|March 10, 1995

まとめ

RuvAとRuvBのタンパク質は,遺伝的再結合と修復の間にDNAの分岐移動を駆動する. ホリデイ・ジャンクションでの非対称な組み立てが,この重要なDNA移動の方向性を決定する.

科学分野:

分子生物学は分子生物学である.
遺伝学遺伝学とは
バイオケミストリーバイオケミストリー

背景:

RuvAとRuvBのタンパク質は,E. coliの遺伝子再結合とDNA修復に不可欠です.
これらのタンパク質は,これらのプロセスにおける重要な中間体であるホリデイ・ジャンクションの動きを促進します.

研究の目的:

RuvAB媒介のホリデイ交差点支部の移動のメカニズムと極性を調査する.
合成ホリデー結合におけるRuvAおよびRuvBタンパク質の組立ダイナミクスを解明する.

主な方法:

定義されたクロスオーバーポイントを持つ小さな合成ホリデイ・ジャンクションを使用しました.
タンパク質の組立を研究するために,堆積分析とDNase I足跡を用いました.
これらの方法を用いて,枝の移動の極性について調査した.

主要な成果:

RuvAタンパク質は,ホリデイ・ジャンクション・クロスオーバーの4つのDNA鎖すべてを結合し,保護します.
RuvBタンパク質は,DNAに非対称な結合を示す.
RuvABコンプレックス・アセンブリは非対称であり,ブランチ移動の極性を定義する.

結論:

RuvAB媒介の枝移りには,定義された極性があります.
RuvBの非対称な結合は,ブランチ移行を指示する上で非常に重要です.
RuvABがDNAをRuvBのヘクサメリクリングを通過させるモデルは,観測された極性を説明します.

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