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: 2.7 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.256 

wwPDB Validation 3D Report Full Report


This is version 1.2 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:  

  • 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.,Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, Pennsylvania, USA.,Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA xiangy@uthscsa.edu junpeng.deng@okstate.edu.,Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA.,Department of Biochemistry and Molecular Biology, Oklahoma State University, Stillwater, Oklahoma, USA xiangy@uthscsa.edu junpeng.deng@okstate.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Late protein H7
A, B, C, D
147Vaccinia virus (strain Western Reserve)Mutation(s): 1 
Find proteins for P08586 (Vaccinia virus (strain Western Reserve))
Go to UniProtKB:  P08586
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.256 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 118.714α = 90.00
b = 68.048β = 90.00
c = 81.811γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesAI081928
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesAI113539

Revision History 

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