6C3R

Cricket paralysis virus RNAi suppressor protein CrPV-1A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.222 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

A Viral Protein Restricts Drosophila RNAi Immunity by Regulating Argonaute Activity and Stability.

Nayak, A.Kim, D.Y.Trnka, M.J.Kerr, C.H.Lidsky, P.V.Stanley, D.J.Rivera, B.M.Li, K.H.Burlingame, A.L.Jan, E.Frydman, J.Gross, J.D.Andino, R.

(2018) Cell Host Microbe 24: 542-557.e9

  • DOI: https://doi.org/10.1016/j.chom.2018.09.006
  • Primary Citation of Related Structures:  
    6C3R

  • PubMed Abstract: 

    The dicistrovirus, Cricket paralysis virus (CrPV) encodes an RNA interference (RNAi) suppressor, 1A, which modulates viral virulence. Using the Drosophila model, we combined structural, biochemical, and virological approaches to elucidate the strategies by which CrPV-1A restricts RNAi immunity. The atomic resolution structure of CrPV-1A uncovered a flexible loop that interacts with Argonaute 2 (Ago-2), thereby inhibiting Ago-2 endonuclease-dependent immunity. Mutations disrupting Ago-2 binding attenuates viral pathogenesis in wild-type but not Ago-2-deficient flies. CrPV-1A also contains a BC-box motif that enables the virus to hijack a host Cul2-Rbx1-EloBC ubiquitin ligase complex, which promotes Ago-2 degradation and virus replication. Our study uncovers a viral-based dual regulatory program that restricts antiviral immunity by direct interaction with and modulation of host proteins. While the direct inhibition of Ago-2 activity provides an efficient mechanism to establish infection, the recruitment of a ubiquitin ligase complex enables CrPV-1A to amplify Ago-2 inactivation to restrict further antiviral RNAi immunity.


  • Organizational Affiliation

    Department of Microbiology and Immunology, University of California San Francisco, San Francisco, CA 94158, USA; Department of Biology and Genetics, Stanford University, Stanford, CA 94305, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cricket paralysis virus 1A protein
A, B
141Cricket paralysis virus Teleogryllus commodus/Australia/CrPVVIC/1968Mutation(s): 0 
Gene Names: ORF1
EC: 3.4.22 (PDB Primary Data), 2.7.7.48 (PDB Primary Data)
UniProt
Find proteins for Q9IJX4 (Cricket paralysis virus (isolate Teleogryllus commodus/Australia/CrPVVIC/1968))
Explore Q9IJX4 
Go to UniProtKB:  Q9IJX4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9IJX4
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.222 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.854α = 90
b = 52.117β = 90
c = 111.43γ = 90
Software Package:
Software NamePurpose
HKL-2000data scaling
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
SOLVEphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesR01 AI36178, AI40085
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesP01 AI091575
Department of Defense (DOD, United States)United StatesDARPA Prophecy

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-17
    Type: Initial release
  • Version 1.1: 2019-02-20
    Changes: Author supporting evidence, Data collection
  • Version 1.2: 2019-05-01
    Changes: Data collection, Database references
  • Version 1.3: 2019-12-18
    Changes: Author supporting evidence