Filamentous Bacteriophage PH75

Experimental Data Snapshot

  • Resolution: 2.40 Å
  • R-Value Free: 0.400 
  • R-Value Work: 0.220 

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This is version 1.3 of the entry. See complete history


The Protein Capsid of Filamentous Bacteriophage Ph75 from Thermus Thermophilus

Pederson, D.M.Welsh, L.C.Marvin, D.A.Sampson, M.Perham, R.N.Yu, M.Slater, M.R.

(2001) J Mol Biol 309: 401

  • DOI: https://doi.org/10.1006/jmbi.2001.4685
  • Primary Citation of Related Structures:  
    1HGV, 1HGZ, 1HH0

  • PubMed Abstract: 

    The PH75 strain of filamentous bacteriophage (Inovirus) grows in the thermophilic bacterium Thermus thermophilus at 70 degrees C. We have characterized the viral DNA and determined the amino acid sequence of the major coat protein, p8. The p8 protein is synthesized without a leader sequence, like that of bacteriophage Pf3 but unlike that of bacteriophage Pf1, both of which grow in the mesophile Pseudomonas aeruginosa. X-ray diffraction patterns from ordered fibres of the PH75 virion are similar to those from bacteriophages Pf1 and Pf3, indicating that the protein capsid of the PH75 virion has the same helix symmetry and subunit shape, even though the primary structures of the major coat proteins are quite different and the virions assemble at very different temperatures. We have used this information to build a molecular model of the PH75 protein capsid based on that of Pf1, and refined the model by simulated annealing, using fibre diffraction data extending to 2.4 A resolution in the meridional direction and to 3.1 A resolution in the equatorial direction. The common design may reflect a fundamental motif of alpha-helix packing, although differences exist in the DNA packaging and in the means of insertion of the major coat protein of these filamentous bacteriophages into the membrane of the host bacterial cell. These may reflect differences in the assembly mechanisms of the virions.

  • Organizational Affiliation

    Cambridge Centre for Molecular Recognition, Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PH75 INOVIRUS MAJOR COAT PROTEIN46Thermus phage PH75Mutation(s): 0 
Membrane Entity: Yes 
Find proteins for P82889 (Thermus phage PH75)
Explore P82889 
Go to UniProtKB:  P82889
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP82889
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.40 Å
  • R-Value Free: 0.400 
  • R-Value Work: 0.220 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 1α = 90
b = 1β = 90
c = 1γ = 90
Software Package:
Software NamePurpose
CCP13data reduction
CCP13-FDSCALEdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-06-01
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description