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TitleIn situ Structure of Rotavirus VP1 RNA-Dependent RNA Polymerase.
Journal, issue, pagesJ Mol Biol, Vol. 431, Issue 17, Page 3124-3138, Year 2019
Publish dateAug 9, 2019
AuthorsSimon Jenni / Eric N Salgado / Tobias Herrmann / Zongli Li / Timothy Grant / Nikolaus Grigorieff / Stefano Trapani / Leandro F Estrozi / Stephen C Harrison /
PubMed AbstractRotaviruses, like other non-enveloped, double-strand RNA viruses, package an RNA-dependent RNA polymerase (RdRp) with each duplex of their segmented genomes. Rotavirus cell entry results in loss of ...Rotaviruses, like other non-enveloped, double-strand RNA viruses, package an RNA-dependent RNA polymerase (RdRp) with each duplex of their segmented genomes. Rotavirus cell entry results in loss of an outer protein layer and delivery into the cytosol of an intact, inner capsid particle (the "double-layer particle," or DLP). The RdRp, designated VP1, is active inside the DLP; each VP1 achieves many rounds of mRNA transcription from its associated genome segment. Previous work has shown that one VP1 molecule lies close to each 5-fold axis of the icosahedrally symmetric DLP, just beneath the inner surface of its protein shell, embedded in tightly packed RNA. We have determined a high-resolution structure for the rotavirus VP1 RdRp in situ, by local reconstruction of density around individual 5-fold positions. We have analyzed intact virions ("triple-layer particles"), non-transcribing DLPs and transcribing DLPs. Outer layer dissociation enables the DLP to synthesize RNA, in vitro as well as in vivo, but appears not to induce any detectable structural change in the RdRp. Addition of NTPs, Mg, and S-adenosylmethionine, which allows active transcription, results in conformational rearrangements, in both VP1 and the DLP capsid shell protein, that allow a transcript to exit the polymerase and the particle. The position of VP1 (among the five symmetrically related alternatives) at one vertex does not correlate with its position at other vertices. This stochastic distribution of site occupancies limits long-range order in the 11-segment, double-strand RNA genome.
External linksJ Mol Biol / PubMed:31233764 / PubMed Central
MethodsEM (single particle)
Resolution3.3 - 5.2 Å
Structure data

20086

6oj3

EMDB-20086, PDB-6oj3:
In situ structure of rotavirus VP1 RNA-dependent RNA polymerase (TLP)
Method: EM (single particle) / Resolution: 4.5 Å

20087

6oj4

EMDB-20087, PDB-6oj4:
In situ structure of rotavirus VP1 RNA-dependent RNA polymerase (DLP)
Method: EM (single particle) / Resolution: 3.3 Å

20088

6oj5

EMDB-20088, PDB-6oj5:
In situ structure of rotavirus VP1 RNA-dependent RNA polymerase (TLP_RNA)
Method: EM (single particle) / Resolution: 5.2 Å

20089

6oj6

EMDB-20089, PDB-6oj6:
In situ structure of rotavirus VP1 RNA-dependent RNA polymerase (DLP_RNA)
Method: EM (single particle) / Resolution: 4.2 Å

Source
  • rotavirus a (strain rva/monkey/united states/rrv/1975/g3p5b[3])
KeywordsVIRAL PROTEIN/TRANSFERASE / Rotavirus / RNA-dependent RNA polymerase / VP1 / VP2 / VIRAL PROTEIN-TRANSFERASE complex / VIRAL PROTEIN/TRANSFERASE/RNA / VIRAL PROTEIN-TRANSFERASE-RNA complex

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