6Z0V
CryoEM structure of the Chikungunya virus nsP1 complex
Summary for 6Z0V
| Entry DOI | 10.2210/pdb6z0v/pdb |
| EMDB information | 11024 |
| Descriptor | Polyprotein P1234, ZINC ION (3 entities in total) |
| Functional Keywords | capping enzyme, monotopic membrane complex, membrane bending, membrane pore, replication complex, scaffold, spherule formation, viral factory., viral protein |
| Biological source | Chikungunya virus strain S27-African prototype |
| Total number of polymer chains | 12 |
| Total formula weight | 637553.28 |
| Authors | Reguera, J.,Jones, R.,Arranz-Avila, R. (deposition date: 2020-05-11, release date: 2020-10-14, Last modification date: 2024-05-22) |
| Primary citation | Jones, R.,Bragagnolo, G.,Arranz, R.,Reguera, J. Capping pores of alphavirus nsP1 gate membranous viral replication factories. Nature, 589:615-619, 2021 Cited by PubMed Abstract: Positive-sense single-stranded RNA viruses, such as coronaviruses, flaviviruses and alphaviruses, carry out transcription and replication inside virus-induced membranous organelles within host cells. The remodelling of the host-cell membranes for the formation of these organelles is coupled to the membrane association of viral replication complexes and to RNA synthesis. These viral niches allow for the concentration of metabolites and proteins for the synthesis of viral RNA, and prevent the detection of this RNA by the cellular innate immune system. Here we present the cryo-electron microscopy structure of non-structural protein 1 (nsP1) of the alphavirus chikungunya virus, which is responsible for RNA capping and membrane binding of the viral replication machinery. The structure shows the enzyme in its active form, assembled in a monotopic membrane-associated dodecameric ring. The structure reveals the structural basis of the coupling between membrane binding, oligomerization and allosteric activation of the capping enzyme. The stoichiometry-with 12 active sites in a single complex-redefines viral replication complexes as RNA synthesis reactors. The ring shape of the complex implies it has a role in controlling access to the viral organelle and ensuring the exit of properly capped viral RNA. Our results provide high-resolution information about the membrane association of the replication machinery of positive-sense single-stranded RNA viruses, and open up avenues for the further characterization of viral replication on cell membranes and the generation of antiviral agents. PubMed: 33328629DOI: 10.1038/s41586-020-3036-8 PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (2.6 Å) |
Structure validation
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