5FW5

Crystal structure of human G3BP1 in complex with Semliki Forest Virus nsP3-25 comprising two FGDF motives


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.92 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 

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This is version 1.2 of the entry. See complete history


Literature

Combined structural, biochemical and cellular evidence demonstrates that both FGDF motifs in alphavirus nsP3 are required for efficient replication.

Schulte, T.Liu, L.Panas, M.D.Thaa, B.Dickson, N.Gotte, B.Achour, A.McInerney, G.M.

(2016) Open Biol 6

  • DOI: 10.1098/rsob.160078
  • Primary Citation of Related Structures:  
    5FW5

  • PubMed Abstract: 
  • Recent findings have highlighted the role of the Old World alphavirus non-structural protein 3 (nsP3) as a host defence modulator that functions by disrupting stress granules, subcellular phase-dense RNA/protein structures formed upon environmental stress ...

    Recent findings have highlighted the role of the Old World alphavirus non-structural protein 3 (nsP3) as a host defence modulator that functions by disrupting stress granules, subcellular phase-dense RNA/protein structures formed upon environmental stress. This disruption mechanism was largely explained through nsP3-mediated recruitment of the host G3BP protein via two tandem FGDF motifs. Here, we present the 1.9 Å resolution crystal structure of the NTF2-like domain of G3BP-1 in complex with a 25-residue peptide derived from Semliki Forest virus nsP3 (nsP3-25). The structure reveals a poly-complex of G3BP-1 dimers interconnected through the FGDF motifs in nsP3-25. Although in vitro and in vivo binding studies revealed a hierarchical interaction of the two FGDF motifs with G3BP-1, viral growth curves clearly demonstrated that two intact FGDF motifs are required for efficient viral replication. Chikungunya virus nsP3 also binds G3BP dimers via a hierarchical interaction, which was found to be critical for viral replication. These results highlight a conserved molecular mechanism in host cell modulation.


    Organizational Affiliation

    Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden gerald.mcinerney@ki.se.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
RAS GTPASE-ACTIVATING PROTEIN-BINDING PROTEIN 1A, B140Homo sapiensMutation(s): 0 
Gene Names: G3BP1G3BP
EC: 3.6.4.12 (PDB Primary Data), 3.6.4.13 (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for Q13283 (Homo sapiens)
Explore Q13283 
Go to UniProtKB:  Q13283
PHAROS:  Q13283
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
NON-STRUCTURAL PROTEIN 3C25Semliki Forest virusMutation(s): 0 
EC: 2.1.1 (UniProt), 2.7.7 (UniProt), 3.1.3.33 (UniProt), 3.4.22 (UniProt), 3.6.1.15 (UniProt), 3.6.4.13 (UniProt), 3.1.3.84 (UniProt), 2.7.7.19 (UniProt), 2.7.7.48 (UniProt)
UniProt
Find proteins for P08411 (Semliki forest virus)
Explore P08411 
Go to UniProtKB:  P08411
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.92 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 94.975α = 90
b = 94.975β = 90
c = 107.593γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-07-20
    Type: Initial release
  • Version 1.1: 2016-12-28
    Changes: Derived calculations, Other
  • Version 1.2: 2017-03-22
    Changes: Database references, Source and taxonomy