4JPP

Bacteriophage phiX174 H protein residues 143-282


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.245 

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:  

  • 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 ...

    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

    1] Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907, USA [2].




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Minor spike protein H
A, B, C, D, E
140Enterobacteria phage phiX174Mutation(s): 0 
Gene Names: H
Find proteins for P03646 (Enterobacteria phage phiX174)
Go to UniProtKB:  P03646
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.245 
  • Space Group: P 42 21 2
Unit Cell:
Length (Å)Angle (°)
a = 68.699α = 90.00
b = 68.699β = 90.00
c = 372.596γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
HKL-2000data reduction
Locallydata collection
PHENIXrefinement
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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