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Updated: Mar 6, 2026

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核酸结合的Redondovirus Rep蛋白质链接构造和功能结构

Saira Montermoso^1,2, Kushol Gupta², Ruth Anne Pumroy³

¹Graduate Group in Biochemistry and Molecular Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America.

|March 4, 2026

概括

研究人员可视化了Redondovirus Rep蛋白质的结构,揭示了它在病毒DNA复制中的功能. 这项研究突出了ADP结合状态中独特的楼梯布局,这对于圆形DNA病毒中螺旋酶活性至关重要.

科学领域:

结构生物学结构生物学
病毒学病毒学
生物化学生物化学

背景情况:

循环Rep编码单链DNA (CRESS-DNA) 病毒利用Rep蛋白进行复制.
替代蛋白具有切割内核酶和NTP依赖的基酶活动.
红红病毒 (Redondoviridae) 是一种新发现的与人类相关的CRESS-DNA病毒家族.

研究的目的:

为了确定红红病毒Rep蛋白的结构.
阐明Rep蛋白在病毒DNA复制中的功能机制.
研究Rep蛋白组合的寡合状态和功能影响.

主要方法:

使用冷电子显微镜 (cryo-EM) 来描述Rep蛋白结构.
生物物理分析被用来研究Rep的寡合化.
结构确定与ATPγS和ADP结合的六合体和十二合体Rep状态.

主要成果:

确定了与ATPγS和ADP结合的Redondovirus Rep的六米结构.
与ADP结合的Rep表现出DNA结合环的阶梯排列,这对于SF3螺旋酶功能至关重要.
ATPγS结合的Rep的头到尾的十二层结构揭示了有序的酶和内核酶域.
保存的残留物表明,十二组件在CRESS-DNA病毒中具有功能相关性.

结论:

对红红病毒复制的结构洞察力为CRESS-DNA病毒复制提供了机械的理解.
已识别的Rep寡合体状态和结构特征为病毒DNA复制策略提供了新的视角.
这项研究为了解Rep蛋白在CRESS-DNA病毒系统中的更广泛的功能作用奠定了基础.

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