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-Structure paper
Title | Molecular architecture of the Chikungunya virus replication complex. |
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Journal, issue, pages | Sci Adv, Vol. 8, Issue 48, Page eadd2536, Year 2022 |
Publish date | Dec 2, 2022 |
Authors | Yaw Bia Tan / David Chmielewski / Michelle Cheok Yien Law / Kuo Zhang / Yu He / Muyuan Chen / Jing Jin / Dahai Luo / |
PubMed Abstract | To better understand how positive-strand (+) RNA viruses assemble membrane-associated replication complexes (RCs) to synthesize, process, and transport viral RNA in virus-infected cells, we ...To better understand how positive-strand (+) RNA viruses assemble membrane-associated replication complexes (RCs) to synthesize, process, and transport viral RNA in virus-infected cells, we determined both the high-resolution structure of the core RNA replicase of chikungunya virus and the native RC architecture in its cellular context at subnanometer resolution, using in vitro reconstitution and in situ electron cryotomography, respectively. Within the core RNA replicase, the viral polymerase nsP4, which is in complex with nsP2 helicase-protease, sits in the central pore of the membrane-anchored nsP1 RNA-capping ring. The addition of a large cytoplasmic ring next to the C terminus of nsP1 forms the holo-RNA-RC as observed at the neck of spherules formed in virus-infected cells. These results represent a major conceptual advance in elucidating the molecular mechanisms of RNA virus replication and the principles underlying the molecular architecture of RCs, likely to be shared with many pathogenic (+) RNA viruses. |
External links | Sci Adv / PubMed:36449616 / PubMed Central |
Methods | EM (subtomogram averaging) / EM (single particle) |
Resolution | 2.8 - 9.9 Å |
Structure data | EMDB-27245: In situ structure of the Chikungunya virus replication complex EMDB-27268: In situ structure of the non-replicative Chikungunya virus nonstructural protein complex EMDB-33591, PDB-7y38: |
Chemicals | ChemComp-ZN: ChemComp-ATP: ChemComp-GTP: |
Source |
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Keywords | VIRAL PROTEIN/RNA / replicase / replication complex / viral RNA replication / capping / helicase / protease / RNA-dependent RNA polymerase / RdRp / VIRAL PROTEIN / VIRAL PROTEIN-RNA complex |