一个多基 (ADP-ribose) 糖酶的结构和催化机制
Dea Slade1, Mark S Dunstan, Eva Barkauskaite
1Cancer Research UK, Paterson Institute for Cancer Research, University of Manchester, Wilmslow Road, Manchester M20 4BX, UK.
Nature
|September 6, 2011
概括
多ADP-ribosyl化对于基因组的稳定性至关重要. 研究人员在真菌和细菌中发现了一种异型的Poly (ADP-ribose) 糖酶 (PARG),揭示了它的结构和催化机制.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 通过多ADP-ribosyl) 化进行翻译后修改,调节关键细胞通路,如DNA修复和亡.
- 聚ADP-核糖) (PAR) 链由NAD由PAR聚合酶合成.
- 帕尔糖酶 (PARG) 是唯一负责化帕尔链的酶,其缺失是致命的.
研究的目的:
- 研究非哺乳动物生物中PARG的结构和功能特征.
- 为了阐明PARG的催化机制和基质结合.
- 为了提供对蛋白质多化 (ADP-ribosyl) 调节及其与人类疾病的联系的见解.
主要方法:
- 进行X射线晶体学以确定Thermomonospora curvata PARG.的结构.
- 生物化学试验用于研究酶活性和抑制剂结合.
- 细菌/真菌PARG与人类PARG的比较分析.
主要成果:
- 在线状真菌和细菌中发现了一种具有保存特征的PARG分离形式.
- 从Thermomonospora curvata中确定了PARG的第一个晶体结构.
- 基于结构和生化数据,提出了一种基于PARG的PAR结合和催化模型.
结论:
- 细菌和真菌的PARG与人类的PARG共享关键特征,这表明其功能得到保护.
- 确定的PARG结构为理解PAR链水解提供了分子基础.
- 这项研究增强了对PARG在调节蛋白质多化 (ADP-ribosyl) 的作用及其对人类健康的影响的理解.
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