PARP14是单一ADP-ribosylation的写入器,读取器和擦除器
Archimede Torretta1, Constantinos Chatzicharalampous1, Carmen Ebenwaldner1
1Department of Chemistry, Center for Molecular Protein Science (CMPS), Lund University, Lund, Sweden.
The Journal of biological chemistry
|July 28, 2023
概括
研究人员描述了PARP14的宏观体-1并发现它具有类似于PARP9.9的ADP-ribosyl glycohydrolase活性. 这一发现影响了对PARP14和PARP9在疾病和治疗中的作用的理解.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 酶学 是一种酶学.
背景情况:
- 聚基聚合酶 (PARP) 是DNA修复和信号传递中的关键酶.
- PARP14/BAL2与癌症,炎症和感染有关,其领域是治疗的目标.
- 在此之前,PARP14 macrodomain-1 (MD1) 的功能尚不清楚,与MD2和MD3.3不同.
研究的目的:
- 生物化学描述PARP14 MD1.1的酶活性.
- 为了研究PARP9.9的同源巨蛋白-1.
- 为了阐明这些宏主体在ADP-ribosylation中的功能作用.
主要方法:
- 测量ADP-ribosylation水平的生物化学测定.
- 描述PARP14 MD1和PARP9 MD1活动的特征.
- 针对位点的突变发生 (PARP14中的F926A,PARP9中的F244A) 来评估活动.
主要成果:
- 无论是PARP14 MD1还是PARP9 MD1,都表现出ADP-ribosyl糖酶活性.
- 这种活动并不特定于蛋白质侧链.
- PARP14 MD1不会降解多 (ADP-ribose) 的作用.
- 突变F926A (PARP14) 和F244A (PARP9) 显著降低了糖酶活性,表明与SARS-CoV-2 Nsp3 Mac1.1.的机制相似.
结论:
- PARP14 MD1和PARP9 MD1被确定为人类新型ADP-ribosyl糖酶.
- 这一发现增加了已知的人类甘油酶的谱.
- 这些结果需要重新评估如何研究和理解PARP14和PARP9功能在生物学途径和疾病中.
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