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-Structure paper
タイトル | Structural insight into RNA synthesis by influenza D polymerase. |
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ジャーナル・号・ページ | Nat Microbiol, Vol. 4, Issue 10, Page 1750-1759, Year 2019 |
掲載日 | 2019年6月17日 |
著者 | Qi Peng / Yuqian Liu / Ruchao Peng / Min Wang / Wei Yang / Hao Song / Yuhai Chen / Sheng Liu / Min Han / Xinzheng Zhang / Peiyi Wang / Jinghua Yan / Buchang Zhang / Jianxun Qi / Tao Deng / George F Gao / Yi Shi / |
PubMed 要旨 | The influenza virus polymerase uses capped RNA primers to initiate transcription, and a combination of terminal and internal de novo initiations for the two-step replication process by binding the ...The influenza virus polymerase uses capped RNA primers to initiate transcription, and a combination of terminal and internal de novo initiations for the two-step replication process by binding the conserved viral genomic RNA (vRNA) or complementary RNA (cRNA) promoter. Here, we determined the apo and promoter-bound influenza D polymerase structures using cryo-electron microscopy and found the polymerase has an evolutionarily conserved stable core structure with inherently flexible peripheral domains. Strikingly, two conformations (mode A and B) of the vRNA promoter were observed where the 3'-vRNA end can bind at two different sites, whereas the cRNA promoter only binds in the mode B conformation. Functional studies confirmed the critical role of the mode B conformation for vRNA synthesis via the intermediate cRNA but not for cRNA production, which is mainly regulated by the mode A conformation. Both conformations participate in the regulation of the transcription process. This work advances our understanding of the regulatory mechanisms for the synthesis of different RNA species by influenza virus polymerase and opens new opportunities for antiviral drug design. |
リンク | Nat Microbiol / PubMed:31209309 |
手法 | EM (単粒子) |
解像度 | 3.4 - 4.6 Å |
構造データ | EMDB-9577: structure of influenza D virus apo polymerase EMDB-9578, PDB-6kuk: EMDB-9579, PDB-6kup: EMDB-9580: structure of influenza D virus polymerase bound to vRNA promoter in Mode B conformation (Class B2) EMDB-9581, PDB-6kur: EMDB-9582, PDB-6kuu: |
由来 |
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キーワード | VIRAL PROTEIN/RNA / influenza D virus / polymerase / cryo-EM / VIRAL PROTEIN-RNA complex / RNA BINDING PROTEIN / VIRAL PROTEIN |