4JPP

Bacteriophage phiX174 H protein residues 143-282


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.248 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Icosahedral bacteriophage Phi X174 forms a tail for DNA transport during infection.

Sun, L.Young, L.N.Zhang, X.Boudko, S.P.Fokine, A.Zbornik, E.Roznowski, A.P.Molineux, I.J.Rossmann, M.G.Fane, B.A.

(2014) Nature 505: 431-435

  • DOI: 10.1038/nature12816
  • Primary Citation of Related Structures:  
    4JPN, 4JPP

  • PubMed Abstract: 
  • Prokaryotic viruses have evolved various mechanisms to transport their genomes across bacterial cell walls. Many bacteriophages use a tail to perform this function, whereas tail-less phages rely on host organelles. However, the tail-less, icosahedral, single-stranded DNA ΦX174-like coliphages do not fall into these well-defined infection processes ...

    Prokaryotic viruses have evolved various mechanisms to transport their genomes across bacterial cell walls. Many bacteriophages use a tail to perform this function, whereas tail-less phages rely on host organelles. However, the tail-less, icosahedral, single-stranded DNA ΦX174-like coliphages do not fall into these well-defined infection processes. For these phages, DNA delivery requires a DNA pilot protein. Here we show that the ΦX174 pilot protein H oligomerizes to form a tube whose function is most probably to deliver the DNA genome across the host's periplasmic space to the cytoplasm. The 2.4 Å resolution crystal structure of the in vitro assembled H protein's central domain consists of a 170 Å-long α-helical barrel. The tube is constructed of ten α-helices with their amino termini arrayed in a right-handed super-helical coiled-coil and their carboxy termini arrayed in a left-handed super-helical coiled-coil. Genetic and biochemical studies demonstrate that the tube is essential for infectivity but does not affect in vivo virus assembly. Cryo-electron tomograms show that tubes span the periplasmic space and are present while the genome is being delivered into the host cell's cytoplasm. Both ends of the H protein contain transmembrane domains, which anchor the assembled tubes into the inner and outer cell membranes. The central channel of the H-protein tube is lined with amide and guanidinium side chains. This may be a general property of viral DNA conduits and is likely to be critical for efficient genome translocation into the host.


    Organizational Affiliation

    School of Plant Sciences and the BIO5 Institute, University of Arizona, Tucson, Arizona 85721, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Minor spike protein HA, B, C, D, E140Escherichia virus phiX174Mutation(s): 0 
Gene Names: H
UniProt
Find proteins for P03646 (Enterobacteria phage phiX174)
Explore P03646 
Go to UniProtKB:  P03646
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.248 
  • Space Group: P 42 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.699α = 90
b = 68.699β = 90
c = 372.596γ = 90
Software Package:
Software NamePurpose
Locallydata collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-12-11
    Type: Initial release
  • Version 1.1: 2014-01-15
    Changes: Database references
  • Version 1.2: 2014-01-22
    Changes: Database references