4ZKU

P22 Tail Needle Gp26 crystallized at pH 10.0


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.184 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Structural Plasticity of the Protein Plug That Traps Newly Packaged Genomes in Podoviridae Virions.

Bhardwaj, A.Sankhala, R.S.Olia, A.S.Brooke, D.Casjens, S.R.Taylor, D.J.Prevelige, P.E.Cingolani, G.

(2016) J.Biol.Chem. 291: 215-226

  • DOI: 10.1074/jbc.M115.696260
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Bacterial viruses of the P22-like family encode a specialized tail needle essential for genome stabilization after DNA packaging and implicated in Gram-negative cell envelope penetration. The atomic structure of P22 tail needle (gp26) crystallized at ...

    Bacterial viruses of the P22-like family encode a specialized tail needle essential for genome stabilization after DNA packaging and implicated in Gram-negative cell envelope penetration. The atomic structure of P22 tail needle (gp26) crystallized at acidic pH reveals a slender fiber containing an N-terminal "trimer of hairpins" tip. Although the length and composition of tail needles vary significantly in Podoviridae, unexpectedly, the amino acid sequence of the N-terminal tip is exceptionally conserved in more than 200 genomes of P22-like phages and prophages. In this paper, we used x-ray crystallography and EM to investigate the neutral pH structure of three tail needles from bacteriophage P22, HK620, and Sf6. In all cases, we found that the N-terminal tip is poorly structured, in stark contrast to the compact trimer of hairpins seen in gp26 crystallized at acidic pH. Hydrogen-deuterium exchange mass spectrometry, limited proteolysis, circular dichroism spectroscopy, and gel filtration chromatography revealed that the N-terminal tip is highly dynamic in solution and unlikely to adopt a stable trimeric conformation at physiological pH. This is supported by the cryo-EM reconstruction of P22 mature virion tail, where the density of gp26 N-terminal tip is incompatible with a trimer of hairpins. We propose the tail needle N-terminal tip exists in two conformations: a pre-ejection extended conformation, which seals the portal vertex after genome packaging, and a postejection trimer of hairpins, which forms upon its release from the virion. The conformational plasticity of the tail needle N-terminal tip is built in the amino acid sequence, explaining its extraordinary conservation in nature.


    Organizational Affiliation

    From the Department of Biochemistry and Molecular Biology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Tail needle protein gp26
A, B
237Salmonella phage P22Mutation(s): 1 
Gene Names: 26
Find proteins for P35837 (Salmonella phage P22)
Go to UniProtKB:  P35837
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.184 
  • Space Group: P 3
Unit Cell:
Length (Å)Angle (°)
a = 43.200α = 90.00
b = 43.200β = 90.00
c = 271.234γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data reduction
PHASERphasing
AUTOMARdata collection
HKL-2000data scaling
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM 100888

Revision History 

  • Version 1.0: 2015-06-10
    Type: Initial release
  • Version 1.1: 2015-11-25
    Type: Data collection, Database references
  • Version 1.2: 2015-12-02
    Type: Database references
  • Version 1.3: 2016-01-13
    Type: Database references
  • Version 1.4: 2017-09-13
    Type: Author supporting evidence, Database references, Derived calculations