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Dea Slade¹, Mark S Dunstan, Eva Barkauskaite

¹Cancer Research UK, Paterson Institute for Cancer Research, University of Manchester, Wilmslow Road, Manchester M20 4BX, UK.

|September 6, 2011

まとめ

ポリアドプリボシル化がゲノム安定に不可欠である. 研究者らは,菌類とバクテリアでPoly ((ADP-リボース) グリコヒドローラゼ (PARG) の異なる形態を発見し,その構造と触媒機構を明らかにした.

科学分野:

バイオケミストリーバイオケミストリー
分子生物学は分子生物学である.
構造生物学構造生物学とは

背景:

ポリアドプリボシル化による翻訳後の改変は,DNA修復やアポトーシスなどの重要な細胞経路を調節する.
ポリー (((ADP-リボース) (PAR) 鎖は,PARポリメラーゼによってNADから合成される.
PARグリコヒドロラーゼ (PARG) は,PAR鎖を水解する唯一の酵素であり,その欠如は致命的です.

研究の目的:

非哺乳類の生物におけるPARGの構造的,機能的特性を調査する.
PARGの触媒機構と基板結合を解明する.
タンパク質の多分子化 (ADP-リボシル化) の調節と,ヒトの病気との関連に関する洞察を提供するためです.

主な方法:

Thermomonospora curvata PARG.の構造を決定するためのX線結晶学.
酵素活性と阻害剤結合を研究するための生化学分析.
バクテリア/真菌PARGとヒトPARGの比較分析.

主要な成果:

保存された特性を有するPARGの異なる形態が,有糸菌と細菌で特定されました.
Thermomonospora curvataからPARGの最初の結晶構造が決定されました.
構造的および生化学的データに基づいて,PARの結合とPARGによる触媒のモデルが提案されました.

結論:

バクテリアおよび真菌のPARGは,ヒトのPARGと重要な特徴を共有しており,機能が保存されていることを示唆しています.
決定されたPARG構造は,PAR鎖水解を理解するための分子基盤を提供します.
この研究は,タンパク質の多分子化 (ADP-リボシル化) を調節するPARGの役割と,人間の健康への影響についての理解を深める.

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