通过Poly ADP-ribose聚合酶 1 的合作核酸结合
Manana Melikishvili1, Michael G Fried2, Yvonne N Fondufe-Mittendorf3
1Department of Epigenetics, Van Andel Institute, Grand Rapids, MI, 49503, USA.
Scientific reports
|March 30, 2024
概括
聚 (ADP) - 核糖聚合酶1 (PARP1) 结合单链DNA和RNA,具有积极的合作性,其功能独立于其催化域. 核酸的二次结构影响了PARP1的结合史泰基度,揭示了它的多功能连接体识别.
科学领域:
- 分子生物学分子生物学
- 生物化学 生化学
- 遗传学 是一个遗传学.
背景情况:
- 多 (ADP) - 核糖聚合酶1 (PARP1) 是一个参与DNA修复,复制,转录和拼接的核蛋白.
- PARP1与未受损的DNA和RNA的相互作用对其多样化的细胞功能至关重要.
- 了解PARP1的核酸结合机制是阐明其在染色体和RNA生物学中的作用的关键.
研究的目的:
- 研究野生型 (WT) PARP1及其突变体对各种核酸结构的结合特性.
- 确定PARP1的催化域和指在核酸结合和合作性中的作用.
- 探索核酸的二次结构如何影响PARP1结合的固态度和机制.
主要方法:
- 对PARP1结合单链DNA (T20),单链RNA (U20) 和双链DNA (19mer) 的分析.
- 将全长WT PARP1与缺乏催化域 (ΔCAT) 或指1和2 (ΔZn1ΔZn2) 的突变体进行比较.
- 蛋白质 - 核酸复合体体基度和结合模式的表征.
主要成果:
- WT PARP1,ΔCAT和ΔZn1ΔZn2 PARP1形成了和的2:1复合体,其中包含具有正结合合作性的单链寡核酸 (T20,U20).
- 催化域和指1和2都不必用于对单链核酸的合作结合.
- WT PARP1形成了一种4:1复合体,具有双链DNA,而ΔZn1Zn2突变体显示了1:1的静态度,表明结构依赖的结合.
结论:
- PARP1表现出受核酸二级结构影响的结构依赖的结合机制.
- PARP1与多种寡核酸的相互作用对其在染色体和RNA生物学中的功能多功能性至关重要.
- 这些发现为了解PARP1如何在细胞环境中识别不同的核酸配体提供了基础.
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