Real-time analysis of single influenza virus replication complexes reveals large promoter-dependent differences in initiation dynamics
Real-time analysis of single influenza virus replication complexes reveals large promoter-dependent differences in initiation dynamics
复制标题
单一流感病毒复制复合物的实时分析揭示了起始动力学中启动子依赖性的巨大差异
DOI:
10.1101/617613
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Robb N
中科院分区:
文献类型:
--
作者:
Robb N
The viral RNA (vRNA) genome of influenza viruses is replicated by the RNA-dependent RNA polymerase (RNAP) via a complementary RNA (cRNA) intermediate. The vRNA promoter can adopt multiple conformations when bound by the RNAP. However, the dynamics, determinants, and biological role of these conformations are unknown; further, little is known about cRNA promoter conformations. To probe the RNA conformations adopted during initial replication, we monitored single, surface-immobilized vRNA and cRNA initiation complexes in real-time. Our results show that, while the 3′ terminus of the vRNA promoter exists in dynamic equilibrium between pre-initiation and initiation conformations, the cRNA promoter exhibited very limited dynamics. Two residues in the proximal 3′ region of the cRNA promoter (residues absent in the vRNA promoter) allowed the cRNA template strand to reach further into the active site, limiting promoter dynamics. Our results highlight promoter-dependent differences in influenza initiation mechanisms, and advance our understanding of virus replication.
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DOI:
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发表时间:
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Nature reviews. Microbiology
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