1NY6

Crystal structure of sigm54 activator (AAA+ ATPase) in the active state


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.329 
  • R-Value Work: 0.266 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Regulation of the transcriptional activator NtrC1: structural studies of the regulatory and AAA+ ATPase domains

Lee, S.Y.de la Torre, A.Yan, D.Kustu, S.Nixon, B.T.Wemmer, D.E.

(2003) Genes Dev. 17: 2552-2563

  • DOI: 10.1101/gad.1125603
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Transcription by sigma54 RNA polymerase depends on activators that contain ATPase domains of the AAA+ class. These activators, which are often response regulators of two-component signal transduction systems, remodel the polymerase so that it can for ...

    Transcription by sigma54 RNA polymerase depends on activators that contain ATPase domains of the AAA+ class. These activators, which are often response regulators of two-component signal transduction systems, remodel the polymerase so that it can form open complexes at promoters. Here, we report the first crystal structures of the ATPase domain of an activator, the NtrC1 protein from the extreme thermophile Aquifex aeolicus. This domain alone, which is active, crystallized as a ring-shaped heptamer. The protein carrying both the ATPase and adjacent receiver domains, which is inactive, crystallized as a dimer. In the inactive dimer, one residue needed for catalysis is far from the active site, and extensive contacts among the domains prevent oligomerization of the ATPase domain. Oligomerization, which completes the active site, depends on surfaces that are buried in the dimer, and hence, on a rearrangement of the receiver domains upon phosphorylation. A motif in the ATPase domain known to be critical for coupling energy to remodeling of polymerase forms a novel loop that projects from the middle of an alpha helix. The extended, structured loops from the subunits of the heptamer localize to a pore in the center of the ring and form a surface that could contact sigma54.


    Organizational Affiliation

    Graduate Group in Biophysics, University of California, Berkeley, California 94720,USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
transcriptional regulator (NtrC family)
A, B, C, D, E, F, G, H, I, J, K, L, M, N
267Aquifex aeolicus (strain VF5)Gene Names: ntrC1
Find proteins for O67198 (Aquifex aeolicus (strain VF5))
Go to UniProtKB:  O67198
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J, K, L, M, N
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.329 
  • R-Value Work: 0.266 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 106.788α = 70.25
b = 108.265β = 85.90
c = 110.020γ = 73.27
Software Package:
Software NamePurpose
MOLREPphasing
MOSFLMdata reduction
CNSrefinement
CCP4data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-11-11
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance