1TLH

T4 AsiA bound to sigma70 region 4


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

T4 AsiA blocks DNA recognition by remodeling sigma(70) region 4

Lambert, L.J.Wei, Y.Schirf, V.Demeler, B.Werner, M.H.

(2004) Embo J. 23: 2952-2962

  • DOI: 10.1038/sj.emboj.7600312
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Bacteriophage T4 AsiA is a versatile transcription factor capable of inhibiting host gene expression as an 'anti-sigma' factor while simultaneously promoting gene-specific expression of T4 middle genes in conjunction with T4 MotA. To accomplish this ...

    Bacteriophage T4 AsiA is a versatile transcription factor capable of inhibiting host gene expression as an 'anti-sigma' factor while simultaneously promoting gene-specific expression of T4 middle genes in conjunction with T4 MotA. To accomplish this task, AsiA engages conserved region 4 of Eschericia coli sigma70, blocking recognition of most host promoters by sequestering the DNA-binding surface at the AsiA/sigma70 interface. The three-dimensional structure of an AsiA/region 4 complex reveals that the C-terminal alpha helix of region 4 is unstructured, while four other helices adopt a completely different conformation relative to the canonical structure of unbound region 4. That AsiA induces, rather than merely stabilizes, this rearrangement can be realized by comparison to the homologous structures of region 4 solved in a variety of contexts, including the structure of Thermotoga maritima sigmaA region 4 described herein. AsiA simultaneously occupies the surface of region 4 that ordinarily contacts core RNA polymerase (RNAP), suggesting that an AsiA-bound sigma70 may also undergo conformational changes in the context of the RNAP holoenzyme.


    Organizational Affiliation

    Laboratory of Molecular Biophysics, Rockefeller University, New York, NY 10021, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
10 kDa anti-sigma factor
A
90Enterobacteria phage T4Mutation(s): 0 
Gene Names: asiA
Find proteins for P32267 (Enterobacteria phage T4)
Go to UniProtKB:  P32267
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
RNA polymerase sigma factor rpoD
B
81Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: rpoD (alt)
Find proteins for P00579 (Escherichia coli (strain K12))
Go to UniProtKB:  P00579
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 
  • Olderado: 1TLH Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-11-23
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance