3WX4

CRYSTAL STRUCTURE of T4 PHAGE ARN PROTEIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The T4 phage DNA mimic protein Arn inhibits the DNA binding activity of the bacterial histone-like protein H-NS

Ho, C.H.Wang, H.C.Ko, T.P.Chang, Y.C.Wang, A.H.J.

(2014) J Biol Chem 289: 27046-27054

  • DOI: 10.1074/jbc.M114.590851
  • Primary Citation of Related Structures:  
    3WX4

  • PubMed Abstract: 
  • The T4 phage protein Arn (Anti restriction nuclease) was identified as an inhibitor of the restriction enzyme McrBC. However, until now its molecular mechanism remained unclear. In the present study we used structural approaches to investigate biolog ...

    The T4 phage protein Arn (Anti restriction nuclease) was identified as an inhibitor of the restriction enzyme McrBC. However, until now its molecular mechanism remained unclear. In the present study we used structural approaches to investigate biological properties of Arn. A structural analysis of Arn revealed that its shape and negative charge distribution are similar to dsDNA, suggesting that this protein could act as a DNA mimic. In a subsequent proteomic analysis, we found that the bacterial histone-like protein H-NS interacts with Arn, implying a new function. An electrophoretic mobility shift assay showed that Arn prevents H-NS from binding to the Escherichia coli hns and T4 p8.1 promoters. In vitro gene expression and electron microscopy analyses also indicated that Arn counteracts the gene-silencing effect of H-NS on a reporter gene. Because McrBC and H-NS both participate in the host defense system, our findings suggest that T4 Arn might knock down these mechanisms using its DNA mimicking properties.


    Organizational Affiliation

    From the Institute of Biochemical Sciences, National Taiwan University, Taipei 106, Taiwan, Institute of Biological Chemistry, Graduate Institute of Translational Medicine, College of Medical Science and Technology, Taipei Medical University, Taipei 110, Taiwan Core Facilities for Protein Structural Analysis, and ahjwang@gate.sinica.edu.tw.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Anti-restriction endonucleaseA100Escherichia virus T4Mutation(s): 0 
Gene Names: arnasiA.1motA.-6
Find proteins for P39510 (Enterobacteria phage T4)
Explore P39510 
Go to UniProtKB:  P39510
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.959α = 90
b = 81.959β = 90
c = 149.424γ = 120
Software Package:
Software NamePurpose
Blu-Icedata collection
SHELXSphasing
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-08-20
    Type: Initial release
  • Version 1.1: 2014-12-10
    Changes: Database references
  • Version 1.2: 2017-11-22
    Changes: Refinement description