1KU3

Crystal Structure of Thermus aquaticus RNA Polymerase Sigma Subunit Fragment, Region 4


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.218 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of the bacterial RNA polymerase promoter specificity sigma subunit.

Campbell, E.A.Muzzin, O.Chlenov, M.Sun, J.L.Olson, C.A.Weinman, O.Trester-Zedlitz, M.L.Darst, S.A.

(2002) Mol.Cell 9: 527-539

  • Primary Citation of Related Structures:  1KU2, 1KU7

  • PubMed Abstract: 
  • The sigma subunit is the key regulator of bacterial transcription. Proteolysis of Thermus aquaticus sigma(A), which occurred in situ during crystallization, reveals three domains, sigma(2), sigma(3), and sigma(4), connected by flexible linkers. Cryst ...

    The sigma subunit is the key regulator of bacterial transcription. Proteolysis of Thermus aquaticus sigma(A), which occurred in situ during crystallization, reveals three domains, sigma(2), sigma(3), and sigma(4), connected by flexible linkers. Crystal structures of each domain were determined, as well as of sigma(4) complexed with -35 element DNA. Exposed surfaces of each domain are important for RNA polymerase binding. Universally conserved residues important for -10 element recognition and melting lie on one face of sigma(2), while residues important for extended -10 recognition lie on sigma(3). Genetic studies correctly predicted that a helix-turn-helix motif in sigma(4) recognizes the -35 element but not the details of the protein-DNA interactions. Positive control mutants in sigma(4) cluster in two regions, positioned to interact with activators bound just upstream or downstream of the -35 element.


    Organizational Affiliation

    Laboratory of Molecular Biophysics, The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
sigma factor sigA
A
73Thermus aquaticusGene Names: sigA
Find proteins for Q9EZJ8 (Thermus aquaticus)
Go to UniProtKB:  Q9EZJ8
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.218 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 39.804α = 90.00
b = 39.804β = 90.00
c = 66.807γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
MLPHAREphasing
CNSrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-04-03
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance