5CYR

Crystal structure of Thosea asigna virus RNA-dependent RNA polymerase (RdRP) complexed with ATP and ssRNA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.252 
  • R-Value Observed: 0.254 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

The Structure of the RNA-Dependent RNA Polymerase of a Permutotetravirus Suggests a Link between Primer-Dependent and Primer-Independent Polymerases.

Ferrero, D.S.Buxaderas, M.Rodriguez, J.F.Verdaguer, N.

(2015) PLoS Pathog 11: e1005265-e1005265

  • DOI: https://doi.org/10.1371/journal.ppat.1005265
  • Primary Citation of Related Structures:  
    4XHA, 4XHI, 5CX6, 5CYR

  • PubMed Abstract: 

    Thosea asigna virus (TaV), an insect virus belonging to the Permutatetraviridae family, has a positive-sense single-stranded RNA (ssRNA) genome with two overlapping open reading frames, encoding for the replicase and capsid proteins. The particular TaV replicase includes a structurally unique RNA-dependent RNA polymerase (RdRP) with a sequence permutation in the palm sub-domain, where the active site is anchored. This non-canonical arrangement of the RdRP palm is also found in double-stranded RNA viruses of the Birnaviridae family. Both virus families also share a conserved VPg sequence motif at the polymerase N-terminus which in birnaviruses appears to be used to covalently link a fraction of the replicase molecules to the 5'-end of the genomic segments. Birnavirus VPgs are presumed to be used as primers for replication initiation. Here we have solved the crystal structure of the TaV RdRP, the first non-canonical RdRP of a ssRNA virus, in its apo- form and bound to different substrates. The enzyme arranges as a stable dimer maintained by mutual interactions between the active site cleft of one molecule and the flexible N-terminal tail of the symmetrically related RdRP. The latter, partially mimicking the RNA template backbone, is involved in regulating the polymerization activity. As expected from previous sequence-based bioinformatics predictions, the overall architecture of the TaV enzyme shows important resemblances with birnavirus polymerases. In addition, structural comparisons and biochemical analyses reveal unexpected similarities between the TaV RdRP and those of Flaviviruses. In particular, a long loop protruding from the thumb domain towards the central enzyme cavity appears to act as a platform for de novo initiation of RNA replication. Our findings strongly suggest an unexpected evolutionary relationship between the RdRPs encoded by these distant ssRNA virus groups.


  • Organizational Affiliation

    Institut de Biologia Molecular de Barcelona, CSIC, Parc Científic de Barcelona, Barcelona, Spain.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
RNA-dependent RNA polymeraseA [auth B],
B [auth A]
705Thosea asigna virusMutation(s): 0 
Gene Names: RdRp
UniProt
Find proteins for Q6A562 (Thosea asigna virus)
Explore Q6A562 
Go to UniProtKB:  Q6A562
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6A562
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

Download Ideal Coordinates CCD File 
C [auth B]ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
D [auth B],
G [auth A]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
PO4
Query on PO4

Download Ideal Coordinates CCD File 
E [auth B],
H [auth A],
I [auth A],
J [auth A]
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
MG
Query on MG

Download Ideal Coordinates CCD File 
F [auth A]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.252 
  • R-Value Observed: 0.254 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 142.513α = 90
b = 158.339β = 90
c = 217.096γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Spanish Ministry of Economy and CompetitivenessSpainBIO2011-24333
Spanish Ministry of Economy and CompetitivenessSpainAGL2011-24758

Revision History  (Full details and data files)

  • Version 1.0: 2015-11-11
    Type: Initial release
  • Version 1.1: 2015-12-09
    Changes: Database references
  • Version 1.2: 2017-09-06
    Changes: Advisory, Author supporting evidence
  • Version 1.3: 2024-01-10
    Changes: Advisory, Data collection, Database references, Refinement description