DNA複製の完成におけるサームス・サーモフィルス・アルゴナウトの機能

Samson M Jolly¹, Ildar Gainetdinov², Karina Jouravleva²

¹Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01605, USA; Howard Hughes Medical Institute and RNA Therapeutics Institute, University of Massachusetts Medical School, Worcester, MA 01605, USA.

Cell

|August 27, 2020

まとめ

Thermus thermophilusのDNA誘導のArgonaute TtAgoタンパク質はDNA複製と染色体の解き放たれを助ける. このタンパク質は細菌の生存に不可欠で欠けている菌株を上回ります

科学分野:

微生物学
分子生物学
遺伝学

背景:

ユカリオットアルゴナウトのタンパク質は,ウイルスとトランポゾンに対する防御のためにRNAガイドを使用します.
DNA誘導のアルゴナウトTtAgoは,Thermus thermophilusのDNAプラズミッド変異から防御する.

研究の目的:

サームス・サーモフィルスにおけるDNA複製におけるTtAgoの役割を調査する.
バクテリアのゲノム維持における TtAgoの機能を理解するために

主な方法:

TtAgoがDNAガイドに結合するインビボ試験
細菌の成長と形状を観察する.
野生型とTtAgo欠乏菌株の競争能力の比較

主要な成果:

TtAgoは複製終端領域から15 - 18ntのDNAガイドを結合する.
TtAgoは,ギラゼが抑制されたときにゲノム複製の完成を促進します.
TtAgoとギラゼの損失は成長を阻害し,繊維化を引き起こす.

結論:

TtAgoは,Thermus thermophilusのDNA複製と染色体解離に重要な役割を果たしています.
TtAgoは細菌の成長と生存に不可欠であり,特に複製のストレス下にある.
野生型のThermus thermophilusは,TtAgo欠乏菌株に対して競争上の優位性を示しています.

キーワード:

アルゴナウト DNA複製 RNAサイレンシングサームス・サーモフィルスティータゴ脱鎖するジラゼパゴ (PAGO)複製の終点トポイソメラーゼ

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