3RX6

Crystal structure of Polarity Suppression protein from Enterobacteria phage P4


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.039 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The first structure of polarity suppression protein, Psu from enterobacteria phage P4, reveals a novel fold and a knotted dimer

Banerjee, R.Nath, S.Ranjan, A.Khamrui, S.Pani, B.Sen, R.Sen, U.

(2012) J.Biol.Chem. 287: 44667-44675

  • DOI: 10.1074/jbc.M112.423202
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Psu is a capsid decoration protein of bacteriophage P4 and acts as an antiterminator of Rho-dependent transcription termination in bacteria. So far, no structures have been reported for the Psu protein or its homologues. Here, we report the first str ...

    Psu is a capsid decoration protein of bacteriophage P4 and acts as an antiterminator of Rho-dependent transcription termination in bacteria. So far, no structures have been reported for the Psu protein or its homologues. Here, we report the first structure of Psu solved by the Hg(2+) single wavelength anomalous dispersion method, which reveals that Psu exists as a knotted homodimer and is first of its kind in nature. Each monomer of Psu attains a novel fold around a tight coiled-coil motif. CD spectroscopy and the structure of an engineered disulfide-bridged Psu derivative reveal that the protein folds reversibly and reassembles by itself into the knotted dimeric conformation without the requirement of any chaperone. This structure would help to explain the functional properties of the protein and can be used as a template to design a minimal peptide fragment that can be used as a drug against Rho-dependent transcription termination in bacteria.


    Organizational Affiliation

    Crystallography and Molecular Biology Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064, India.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Polarity suppression protein
A
190Enterobacteria phage P4Mutation(s): 0 
Gene Names: psu
Find proteins for P05460 (Enterobacteria phage P4)
Go to UniProtKB:  P05460
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
IOD
Query on IOD

Download SDF File 
Download CCD File 
A
IODIDE ION
I
XMBWDFGMSWQBCA-UHFFFAOYSA-M
 Ligand Interaction
TRS
Query on TRS

Download SDF File 
Download CCD File 
A
2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
TRIS BUFFER
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O
 Ligand Interaction
HG
Query on HG

Download SDF File 
Download CCD File 
A
MERCURY (II) ION
Hg
BQPIGGFYSBELGY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.039 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.192 
  • Space Group: I 4 2 2
Unit Cell:
Length (Å)Angle (°)
a = 148.750α = 90.00
b = 148.750β = 90.00
c = 63.370γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
PHENIXrefinement
SOLVEphasing
iMOSFLMdata reduction
MAR345dtbdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-07-25
    Type: Initial release
  • Version 1.1: 2012-11-21
    Type: Database references
  • Version 1.2: 2013-06-19
    Type: Database references