2OB9

Structure of bacteriophage HK97 tail assembly chaperone


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.235 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

A conserved spiral structure for highly diverged phage tail assembly chaperones.

Pell, L.G.Cumby, N.Clark, T.E.Tuite, A.Battaile, K.P.Edwards, A.M.Chirgadze, N.Y.Davidson, A.R.Maxwell, K.L.

(2013) J Mol Biol 425: 2436-2449

  • DOI: 10.1016/j.jmb.2013.03.035
  • Primary Citation of Related Structures:  
    2OB9

  • PubMed Abstract: 
  • Tail assembly chaperones (TACs) are a family of proteins likely required for the morphogenesis of all long-tailed phages. In this study, we determined the crystal structure of gp13, the TAC of phage HK97. This structure is similar to that of the TAC from the Lactococcus phage p2 and two unannotated structures of likely TACs encoded in prophage-derived regions of Bacillus subtilis and Bacillus stearothermophilus ...

    Tail assembly chaperones (TACs) are a family of proteins likely required for the morphogenesis of all long-tailed phages. In this study, we determined the crystal structure of gp13, the TAC of phage HK97. This structure is similar to that of the TAC from the Lactococcus phage p2 and two unannotated structures of likely TACs encoded in prophage-derived regions of Bacillus subtilis and Bacillus stearothermophilus. Despite the high sequence divergence of these proteins, gp13 forms a ring structure with similar dimensions to the spirals observed in the crystal lattices of these other proteins. Remarkably, these similar quaternary structures are formed through very different interprotomer interactions. We present functional data supporting the biological relevance of these spiral structures and propose that spiral formation has been the primary requirement for these proteins during evolution. This study presents an unusual example of diverged protein sequences and oligomerization mechanisms in the presence of conserved quaternary structure.


    Organizational Affiliation

    Department of Molecular Genetics and Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, Canada M5S 3E1.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Tail assembly chaperoneA, B130Escherichia virus HK97Mutation(s): 0 
Gene Names: HK97p121
UniProt
Find proteins for Q9MCS5 (Enterobacteria phage HK97)
Explore Q9MCS5 
Go to UniProtKB:  Q9MCS5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9MCS5
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.235 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 101.14α = 90
b = 101.14β = 90
c = 63.382γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
SHARPphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-12-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2013-04-10
    Changes: Database references
  • Version 1.3: 2013-07-24
    Changes: Database references