4W60

The structure of Vaccina virus H7 protein displays A Novel Phosphoinositide binding fold required for membrane biogenesis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.256 
  • R-Value Observed: 0.260 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure-function analysis of vaccinia virus h7 protein reveals a novel phosphoinositide binding fold essential for poxvirus replication.

Kolli, S.Meng, X.Wu, X.Shengjuler, D.Cameron, C.E.Xiang, Y.Deng, J.

(2015) J Virol 89: 2209-2219

  • DOI: 10.1128/JVI.03073-14
  • Primary Citation of Related Structures:  
    4W60, 4W5X

  • PubMed Abstract: 
  • Phosphoinositides and phosphoinositide binding proteins play a critical role in membrane and protein trafficking in eukaryotes. Their critical role in replication of cytoplasmic viruses has just begun to be understood. Poxviruses, a family of large c ...

    Phosphoinositides and phosphoinositide binding proteins play a critical role in membrane and protein trafficking in eukaryotes. Their critical role in replication of cytoplasmic viruses has just begun to be understood. Poxviruses, a family of large cytoplasmic DNA viruses, rely on the intracellular membranes to develop their envelope, and poxvirus morphogenesis requires enzymes from the cellular phosphoinositide metabolic pathway. However, the role of phosphoinositides in poxvirus replication remains unclear, and no poxvirus proteins show any homology to eukaryotic phosphoinositide binding domains. Recently, a group of poxvirus proteins, termed viral membrane assembly proteins (VMAPs), were identified as essential for poxvirus membrane biogenesis. A key component of VMAPs is the H7 protein. Here we report the crystal structure of the H7 protein from vaccinia virus. The H7 structure displays a novel fold comprised of seven α-helices and a highly curved three-stranded antiparallel β-sheet. We identified a phosphoinositide binding site in H7, comprised of basic residues on a surface patch and the flexible C-terminal tail. These residues were found to be essential for viral replication and for binding of H7 to phosphatidylinositol-3-phosphate (PI3P) and phosphatidylinositol-4-phosphate (PI4P). Our studies suggest that phosphoinositide binding by H7 plays an essential role in poxvirus membrane biogenesis.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Oklahoma State University, Stillwater, Oklahoma, USA xiangy@uthscsa.edu junpeng.deng@okstate.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Late protein H7ABCD147Vaccinia virus WRMutation(s): 1 
Gene Names: VACWR105H7R
Find proteins for P08586 (Vaccinia virus (strain Western Reserve))
Explore P08586 
Go to UniProtKB:  P08586
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.256 
  • R-Value Observed: 0.260 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 118.714α = 90
b = 68.048β = 90
c = 81.811γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement

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 StatesAI081928
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI113539

Revision History 

  • Version 1.0: 2014-12-31
    Type: Initial release
  • Version 1.1: 2015-02-04
    Changes: Database references
  • Version 1.2: 2017-09-13
    Changes: Author supporting evidence, Database references, Derived calculations, Source and taxonomy
  • Version 1.3: 2019-12-11
    Changes: Author supporting evidence