1RP3

Cocrystal structure of the flagellar sigma/anti-sigma complex, Sigma-28/FlgM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.242 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal Structure of the Flagellar Sigma/Anti-Sigma Complex Sigma(28)/FlgM Reveals an Intact Sigma Factor in an Inactive Conformation

Sorenson, M.K.Ray, S.S.Darst, S.A.

(2004) Mol.Cell 14: 127-138

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The key regulators of bacterial transcription initiation are the sigma factors, which direct promoter recognition and melting but only after binding to the core RNA polymerase to form the holoenzyme. X-ray crystal structures of the flagellar sigma, s ...

    The key regulators of bacterial transcription initiation are the sigma factors, which direct promoter recognition and melting but only after binding to the core RNA polymerase to form the holoenzyme. X-ray crystal structures of the flagellar sigma, sigma(28), in complex with its anti-sigma, FlgM, explain the inhibition mechanism of FlgM, including its ability to attack and destabilize the sigma(28)-holoenzyme. The sigma domains (sigma(2), sigma(3), and sigma(4)) pack together in a compact unit with extensive interdomain interfaces that bury the promoter binding determinants, including the -35 element recognition helix of sigma(4), which fits in an acidic groove on the surface of sigma(3). The structure illustrates the large rearrangements that sigma(28) must undergo to form the holoenzyme and provides insights into the regulation of sigma(28) promoter binding activity that may extend, at least in principle, to other sigmas.


    Organizational Affiliation

    The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
RNA polymerase sigma factor SIGMA-28 (FliA)
A, C, E, G
239Aquifex aeolicus (strain VF5)Mutation(s): 0 
Gene Names: fliA
Find proteins for O67268 (Aquifex aeolicus (strain VF5))
Go to UniProtKB:  O67268
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
anti sigma factor FlgM
B, D, F, H
88Aquifex aeolicus (strain VF5)Mutation(s): 0 
Gene Names: flgM
Find proteins for O66683 (Aquifex aeolicus (strain VF5))
Go to UniProtKB:  O66683
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.242 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 76.388α = 90.00
b = 119.666β = 107.00
c = 100.056γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-04-06
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2019-07-24
    Type: Data collection, Refinement description