1JR5

Solution Structure of the Anti-Sigma Factor AsiA Homodimer


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 25 
  • 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

Solution structure and stability of the anti-sigma factor AsiA: implications for novel functions.

Urbauer, J.L.Simeonov, M.F.Urbauer, R.J.Adelman, K.Gilmore, J.M.Brody, E.N.

(2002) Proc.Natl.Acad.Sci.USA 99: 1831-1835

  • DOI: 10.1073/pnas.032464699

  • PubMed Abstract: 
  • Anti-sigma factors regulate prokaryotic gene expression through interactions with specific sigma factors. The bacteriophage T4 anti-sigma factor AsiA is a molecular switch that both inhibits transcription from bacterial promoters and phage early prom ...

    Anti-sigma factors regulate prokaryotic gene expression through interactions with specific sigma factors. The bacteriophage T4 anti-sigma factor AsiA is a molecular switch that both inhibits transcription from bacterial promoters and phage early promoters and promotes transcription at phage middle promoters through its interaction with the primary sigma factor of Escherichia coli, sigma(70). AsiA is an all-helical, symmetric dimer in solution. The solution structure of the AsiA dimer reveals a novel helical fold for the protomer. Furthermore, the AsiA protomer, surprisingly, contains a helix-turn-helix DNA binding motif, predicting a potential new role for AsiA. The AsiA dimer interface includes a substantial hydrophobic component, and results of hydrogen/deuterium exchange studies suggest that the dimer interface is the most stable region of the AsiA dimer. In addition, the residues that form the dimer interface are those that are involved in binding to sigma(70). The results promote a model whereby the AsiA dimer maintains the active hydrophobic surfaces and delivers them to sigma(70), where an AsiA protomer is displaced from the dimer via the interaction of sigma(70) with the same residues in AsiA that constitute the dimer interface.


    Related Citations: 
    • Conserved Regions 4.1 and 4.2 of Sigma(70) Constitute the Recognition Sites for the Anti-Sigma Factor AsiA, and AsiA is a Dimer Free in Solution
      Urbauer, J.L.,Adelman, K.,Bieber Urbauer, R.J.,Simeonov, M.F.,Gilmore, J.M.,Zolkiewski, M.,Brody, E.N.
      (2001) J.Biol.Chem. 276: 41128
    • Main-chain NMR assignments for AsiA
      Urbauer, J.L.,Adelman, K.,Brody, E.N.
      (1997) J.Biomol.NMR 10: 205


    Organizational Affiliation

    Department of Molecular Biosciences, University of Kansas, Lawrence, KS 66045, USA. jurbauer@ku.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
10 KDA Anti-Sigma Factor
A, B
90Enterobacteria phage T4Gene Names: asiA
Find proteins for P32267 (Enterobacteria phage T4)
Go to UniProtKB:  P32267
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 25 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 1JR5 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-02-20
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance