3PQI

Crystal structure of the bacteriophage phi92 membrane-piercing protein gp138


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.64 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.213 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Phage pierces the host cell membrane with the iron-loaded spike.

Browning, C.Shneider, M.M.Bowman, V.D.Schwarzer, D.Leiman, P.G.

(2012) Structure 20: 326-339

  • DOI: 10.1016/j.str.2011.12.009
  • Primary Citation of Related Structures:  
    3PQH, 3PQI, 3QR7, 3QR8

  • PubMed Abstract: 
  • Bacteriophages with contractile tails and the bacterial type VI secretion system have been proposed to use a special protein to create an opening in the host cell membrane during infection. These proteins have a modular architecture but invariably contain an oligonucleotide/oligosaccharide-binding (OB-fold) domain and a long β-helical C-terminal domain, which initiates the contact with the host cell membrane ...

    Bacteriophages with contractile tails and the bacterial type VI secretion system have been proposed to use a special protein to create an opening in the host cell membrane during infection. These proteins have a modular architecture but invariably contain an oligonucleotide/oligosaccharide-binding (OB-fold) domain and a long β-helical C-terminal domain, which initiates the contact with the host cell membrane. Using X-ray crystallography and electron microscopy, we report the atomic structure of the membrane-piercing proteins from bacteriophages P2 and ϕ92 and identify the residues that constitute the membrane-attacking apex. Both proteins form compact spikes with a ∼10Å diameter tip that is stabilized by a centrally positioned iron ion bound by six histidine residues. The accumulated data strongly suggest that, in the process of membrane penetration, the spikes are translocated through the lipid bilayer without undergoing major unfolding.


    Organizational Affiliation

    Institut de Physique des Systèmes Biologiques, Laboratory of Structural Biology and Biophysics, Ecole Polytechnique Fédérale de Lausanne (EPFL), BSP-415, CH-1015, Lausanne, Switzerland.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
gene product 138A247Bacteriophage sp.Mutation(s): 0 
UniProt
Find proteins for I7HXF9 (Enterobacteria phage phi92)
Explore I7HXF9 
Go to UniProtKB:  I7HXF9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupI7HXF9
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FE
Query on FE

Download Ideal Coordinates CCD File 
B [auth A]FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
 Ligand Interaction
K
Query on K

Download Ideal Coordinates CCD File 
C [auth A]POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.64 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.213 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.144α = 90
b = 65.144β = 90
c = 329.375γ = 120
Software Package:
Software NamePurpose
RemDAqdata collection
PHASERphasing
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-02-22
    Type: Initial release
  • Version 1.1: 2012-02-29
    Changes: Database references
  • Version 1.2: 2017-11-08
    Changes: Refinement description