核酸结合的红红病毒蛋白连接结构和功能
bioRxiv : the preprint server for biology
|September 5, 2025
概括
研究人员揭示了Redondovirus Rep蛋白的结构,该蛋白对CRESS-DNA病毒复制至关重要. 这项研究揭示了关键的结构状态和寡合组合,为病毒DNA复制机制提供了洞察力.
科学领域:
- 结构生物学
- 病毒学
- 生物化学
背景情况:
- 循环Rep编码单链DNA (CRESS-DNA) 病毒使用Rep蛋白进行复制.
- 复制蛋白具有对病毒基因组复制至关重要的切割,螺旋酶和DNA结合活动.
- 一个新发现的人类关联CRESS-DNA病毒的群体Redondoviridae家族在Entamoeba gingivalis中复制.
研究的目的:
- 确定来自Redondoviridae家族的Rep蛋白的第一个结构.
- 阐明病毒DNA复制中的Rep蛋白功能的结构机制.
- 在CRESS-DNA病毒复制中研究寡合状态及其功能影响.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来确定高分辨率结构.
- 与ATPγS和ADP复合的RedondovirusRep酶结构的特征是
- 使用生物物理分析来研究Rep蛋白质的寡合化.
主要成果:
- 在ATP结合 (ATPγS) 和水解后 (ADP) 状态下,Redondovirus Rep的六度结构得到了解决.
- 结合ADP的Rep表现出DNA结合环的阶梯排列,这对于SF3螺旋酶模型至关重要.
- ATPγS- 结合的Rep的头到尾的十二角结构显示了有序的酶和内核酶域.
- 保存的残留物表明,多倍体组合在许多CRESS-DNA病毒中具有功能相关性.
结论:
- 对Redondovirus Rep的结构和寡合洞察力为CRESS-DNA病毒复制提供了更深入的理解.
- 在六合体和观察到的寡合化状态中的内核酶域的定位提供了新的功能视角.
- 这项研究为进一步研究Rep蛋白在病毒生命周期中的作用和潜在的治疗向奠定了基础.
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