3P9A

An atomic view of the nonameric small terminase subunit of Bacteriophage P22


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.755 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.177 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Small terminase couples viral DNA binding to genome-packaging ATPase activity.

Roy, A.Bhardwaj, A.Datta, P.Lander, G.C.Cingolani, G.

(2012) Structure 20: 1403-1413

  • DOI: 10.1016/j.str.2012.05.014

  • PubMed Abstract: 
  • Packaging of viral genomes into empty procapsids is powered by a large DNA-packaging motor. In most viruses, this machine is composed of a large (L) and a small (S) terminase subunit complexed with a dodecamer of portal protein. Here we describe the ...

    Packaging of viral genomes into empty procapsids is powered by a large DNA-packaging motor. In most viruses, this machine is composed of a large (L) and a small (S) terminase subunit complexed with a dodecamer of portal protein. Here we describe the 1.75 Å crystal structure of the bacteriophage P22 S-terminase in a nonameric conformation. The structure presents a central channel ∼23 Å in diameter, sufficiently large to accommodate hydrated B-DNA. The last 23 residues of S-terminase are essential for binding to DNA and assembly to L-terminase. Upon binding to its own DNA, S-terminase functions as a specific activator of L-terminase ATPase activity. The DNA-dependent stimulation of ATPase activity thus rationalizes the exclusive specificity of genome-packaging motors for viral DNA in the crowd of host DNA, ensuring fidelity of packaging and avoiding wasteful ATP hydrolysis. This posits a model for DNA-dependent activation of genome-packaging motors of general interest in virology.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Thomas Jefferson University, 233 South 10th Street, Philadelphia, PA 19107, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA-packaging protein gp3
A, B, C, D, E, F, G, H, I
162Salmonella phage P22Mutation(s): 0 
Gene Names: 3
Find proteins for P04893 (Salmonella phage P22)
Go to UniProtKB:  P04893
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.755 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.177 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 76.480α = 90.00
b = 100.900β = 93.73
c = 89.847γ = 90.00
Software Package:
Software NamePurpose
ADSCdata collection
HKL-2000data scaling
HKL-2000data reduction
PHENIXrefinement
SOLVEphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-05-09
    Type: Initial release
  • Version 1.1: 2012-07-25
    Type: Database references
  • Version 1.2: 2012-08-29
    Type: Database references