2LMC

Structure of T7 transcription factor Gp2-E. coli RNAp jaw domain complex


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural and Mechanistic Basis for the Inhibition of Escherichia coli RNA Polymerase by T7 Gp2.

James, E.Liu, M.Sheppard, C.Mekler, V.Camara, B.Liu, B.Simpson, P.Cota, E.Severinov, K.Matthews, S.Wigneshweraraj, S.

(2012) Mol.Cell 47: 755-766

  • DOI: 10.1016/j.molcel.2012.06.013

  • PubMed Abstract: 
  • The T7 phage-encoded small protein Gp2 is a non-DNA-binding transcription factor that interacts with the jaw domain of the Escherichia coli (Ec) RNA polymerase (RNAp) β' subunit and inhibits transcriptionally proficient promoter-complex (RPo) formati ...

    The T7 phage-encoded small protein Gp2 is a non-DNA-binding transcription factor that interacts with the jaw domain of the Escherichia coli (Ec) RNA polymerase (RNAp) β' subunit and inhibits transcriptionally proficient promoter-complex (RPo) formation. Here, we describe the high-resolution solution structure of the Gp2-Ec β' jaw domain complex and show that Gp2 and DNA compete for binding to the β' jaw domain. We reveal that efficient inhibition of RPo formation by Gp2 requires the amino-terminal σ(70) domain region 1.1 (R1.1), and that Gp2 antagonizes the obligatory movement of R1.1 during RPo formation. We demonstrate that Gp2 inhibits RPo formation not just by steric occlusion of the RNAp-DNA interaction but also through long-range antagonistic effects on RNAp-promoter interactions around the RNAp active center that likely occur due to repositioning of R1.1 by Gp2. The inhibition of Ec RNAp by Gp2 thus defines a previously uncharacterized mechanism by which bacterial transcription is regulated by a viral factor.


    Organizational Affiliation

    MRC Centre for Molecular Bacteriology and Infection, Imperial College London, London SW7 2AZ, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Bacterial RNA polymerase inhibitor
A
84Enterobacteria phage T7N/A
Find proteins for P03704 (Enterobacteria phage T7)
Go to UniProtKB:  P03704
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
DNA-directed RNA polymerase subunit beta
B
84Escherichia coli (strain K12)Gene Names: rpoC (tabB)
EC: 2.7.7.6
Find proteins for P0A8T7 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A8T7
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2LMC Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2011-11-29 
  • Released Date: 2012-03-14 
  • Deposition Author(s): Liu, M.

Revision History 

  • Version 1.0: 2012-03-14
    Type: Initial release
  • Version 1.1: 2012-08-01
    Type: Database references
  • Version 1.2: 2012-10-03
    Type: Database references