7EEI

Structure of Rift Valley fever virus RNA-dependent RNA polymerase

7EEI の概要

• エントリーDOI: 10.2210/pdb7eei/pdb
• EMDBエントリー: 31077
• 分子名称: Replicase (1 entity in total)
• 機能のキーワード: polymerase, complex, replicate, viral protein
• 由来する生物種: Rift valley fever virus (RVFV)
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 202260.73

構造登録者

Wang, X.,Hu, C.X. (登録日: 2021-03-18, 公開日: 2021-11-17, 最終更新日: 2025-07-02)

主引用文献

Wang, X.,Hu, C.,Ye, W.,Wang, J.,Dong, X.,Xu, J.,Li, X.,Zhang, M.,Lu, H.,Zhang, F.,Wu, W.,Dai, S.,Wang, H.W.,Chen, Z.
Structure of Rift Valley Fever Virus RNA-Dependent RNA Polymerase.
J.Virol., 96:e0171321-e0171321, 2022

PubMed Abstract: Rift Valley fever virus (RVFV) belongs to the order and is the type species of genus , which accounts for over 50% of family species. RVFV is mosquito-borne and causes severe diseases in both humans and livestock, and consists of three segments (S, M, L) in the genome. The L segment encodes an RNA-dependent RNA polymerase (RdRp, L protein) that is responsible for facilitating the replication and transcription of the virus. It is essential for the virus and has multiple drug targets. Here, we established an expression system and purification procedures for full-length L protein, which is composed of an endonuclease domain, RdRp domain, and cap-binding domain. A cryo-EM L protein structure was reported at 3.6 Å resolution. In this first L protein structure of genus , the priming loop of RVFV L protein is distinctly different from those of other L proteins and undergoes large movements related to its replication role. Structural and biochemical analyses indicate that a single template can induce initiation of RNA synthesis, which is notably enhanced by 5' viral RNA. These findings help advance our understanding of the mechanism of RNA synthesis and provide an important basis for developing antiviral inhibitors. The zoonosis RVF virus (RVFV) is one of the most serious arbovirus threats to both human and animal health. RNA-dependent RNA polymerase (RdRp) is a multifunctional enzyme catalyzing genome replication as well as viral transcription, so the RdRp is essential for studying the virus and has multiple drug targets. In our study, we report the structure of RVFV L protein at 3.6 Å resolution by cryo-EM. This is the first L protein structure of genus . Strikingly, a single template can initiate RNA replication. The structure and assays provide a comprehensive and in-depth understanding of the catalytic and substrate recognition mechanism of RdRp.

PubMed: 34787453
DOI: 10.1128/JVI.01713-21

実験手法

ELECTRON MICROSCOPY (3.6 Å)