4GHL

Structural Basis for Marburg virus VP35 mediate immune evasion mechanisms


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.02 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural basis for Marburg virus VP35-mediated immune evasion mechanisms.

Ramanan, P.Edwards, M.R.Shabman, R.S.Leung, D.W.Endlich-Frazier, A.C.Borek, D.M.Otwinowski, Z.Liu, G.Huh, J.Basler, C.F.Amarasinghe, G.K.

(2012) Proc Natl Acad Sci U S A 109: 20661-20666

  • DOI: 10.1073/pnas.1213559109
  • Primary Citation of Related Structures:  
    4GHL

  • PubMed Abstract: 
  • Filoviruses, marburgvirus (MARV) and ebolavirus (EBOV), are causative agents of highly lethal hemorrhagic fever in humans. MARV and EBOV share a common genome organization but show important differences in replication complex formation, cell entry, host tropism, transcriptional regulation, and immune evasion ...

    Filoviruses, marburgvirus (MARV) and ebolavirus (EBOV), are causative agents of highly lethal hemorrhagic fever in humans. MARV and EBOV share a common genome organization but show important differences in replication complex formation, cell entry, host tropism, transcriptional regulation, and immune evasion. Multifunctional filoviral viral protein (VP) 35 proteins inhibit innate immune responses. Recent studies suggest double-stranded (ds)RNA sequestration is a potential mechanism that allows EBOV VP35 to antagonize retinoic-acid inducible gene-I (RIG-I) like receptors (RLRs) that are activated by viral pathogen-associated molecular patterns (PAMPs), such as double-strandedness and dsRNA blunt ends. Here, we show that MARV VP35 can inhibit IFN production at multiple steps in the signaling pathways downstream of RLRs. The crystal structure of MARV VP35 IID in complex with 18-bp dsRNA reveals that despite the similar protein fold as EBOV VP35 IID, MARV VP35 IID interacts with the dsRNA backbone and not with blunt ends. Functional studies show that MARV VP35 can inhibit dsRNA-dependent RLR activation and interferon (IFN) regulatory factor 3 (IRF3) phosphorylation by IFN kinases TRAF family member-associated NFkb activator (TANK) binding kinase-1 (TBK-1) and IFN kB kinase e (IKKe) in cell-based studies. We also show that MARV VP35 can only inhibit RIG-I and melanoma differentiation associated gene 5 (MDA5) activation by double strandedness of RNA PAMPs (coating backbone) but is unable to inhibit activation of RLRs by dsRNA blunt ends (end capping). In contrast, EBOV VP35 can inhibit activation by both PAMPs. Insights on differential PAMP recognition and inhibition of IFN induction by a similar filoviral VP35 fold, as shown here, reveal the structural and functional plasticity of a highly conserved virulence factor.


    Organizational Affiliation

    Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Polymerase cofactor VP35 ABCD133Lake Victoria marburgvirus - PoppMutation(s): 1 
Gene Names: Polymerase cofactor VP35VP35
Find proteins for Q03039 (Lake Victoria marburgvirus (strain Popp-67))
Explore Q03039 
Go to UniProtKB:  Q03039
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 1
    MoleculeChainsLengthOrganismImage
    short palindromic RNA AGACAGCAUAUGCUGUCUE, F18N/A
    Experimental Data & Validation

    Experimental Data

    • Method: X-RAY DIFFRACTION
    • Resolution: 2.02 Å
    • R-Value Free: 0.240 
    • R-Value Work: 0.187 
    • R-Value Observed: 0.190 
    • Space Group: P 21 21 21
    Unit Cell:
    Length ( Å )Angle ( ˚ )
    a = 83.771α = 90
    b = 93.384β = 90
    c = 102.071γ = 90
    Software Package:
    Software NamePurpose
    HKL-3000data collection
    MOLREPphasing
    REFMACrefinement
    HKL-3000data reduction
    SCALEPACKdata scaling

    Structure Validation

    View Full Validation Report



    Entry History 

    Deposition Data

    Revision History  (Full details and data files)

    • Version 1.0: 2012-11-28
      Type: Initial release
    • Version 1.1: 2012-12-26
      Changes: Database references