8URB image
Entry Detail
PDB ID:
8URB
EMDB ID:
Title:
Porcine epidemic diarrhea virus complete core polymerase complex
Biological Source:
PDB Version:
Deposition Date:
2023-10-25
Release Date:
2023-11-15
Method Details:
Experimental Method:
Resolution:
3.40 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:nsp12
Chain IDs:A
Chain Length:957
Number of Molecules:1
Biological Source:Porcine epidemic diarrhea virus
Polymer Type:polypeptide(L)
Description:nsp8
Chain IDs:B, D
Chain Length:195
Number of Molecules:2
Biological Source:Porcine epidemic diarrhea virus
Polymer Type:polypeptide(L)
Description:nsp7
Chain IDs:C
Chain Length:83
Number of Molecules:1
Biological Source:Porcine epidemic diarrhea virus
Polymer Type:polyribonucleotide
Description:RNA (33-MER)
Chain IDs:E (auth: I)
Chain Length:33
Number of Molecules:1
Biological Source:synthetic construct
Polymer Type:polyribonucleotide
Description:RNA (55-MER)
Chain IDs:F (auth: J)
Chain Length:55
Number of Molecules:1
Biological Source:synthetic construct
Ligand Molecules
Primary Citation
An alphacoronavirus polymerase structure reveals conserved co-factor functions.
Biorxiv ? ? ? (2023)
PMID: 36993498 DOI: 10.1101/2023.03.15.532841

Abstact

Coronaviruses are a diverse subfamily of viruses containing pathogens of humans and animals. This subfamily of viruses replicates their RNA genomes using a core polymerase complex composed of viral non-structural proteins: nsp7, nsp8 and nsp12. Most of our understanding of coronavirus molecular biology comes from the betacoronaviruses like SARS-CoV and SARS-CoV-2, the latter of which is the causative agent of COVID-19. In contrast, members of the alphacoronavirus genus are relatively understudied despite their importance in human and animal health. Here we have used cryo-electron microscopy to determine the structure of the alphacoronavirus porcine epidemic diarrhea virus (PEDV) core polymerase complex bound to RNA. Our structure shows an unexpected nsp8 stoichiometry in comparison to other published coronavirus polymerase structures. Biochemical analysis shows that the N-terminal extension of one nsp8 is not required for in vitro RNA synthesis for alpha and betacoronaviruses as previously hypothesized. Our work shows the importance of studying diverse coronaviruses to reveal aspects of coronavirus replication while also identifying areas of conservation to be targeted by antiviral drugs.

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Protein

Chemical

Disease

Primary Citation of related structures