3ULQ

Crystal Structure of the Anti-Activator RapF Complexed with the Response Regulator ComA DNA Binding Domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.189 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis of response regulator inhibition by a bacterial anti-activator protein.

Baker, M.D.Neiditch, M.B.

(2011) Plos Biol. 9: e1001226-e1001226

  • DOI: 10.1371/journal.pbio.1001226

  • PubMed Abstract: 
  • The complex interplay between the response regulator ComA, the anti-activator RapF, and the signaling peptide PhrF controls competence development in Bacillus subtilis. More specifically, ComA drives the expression of genetic competence genes, while ...

    The complex interplay between the response regulator ComA, the anti-activator RapF, and the signaling peptide PhrF controls competence development in Bacillus subtilis. More specifically, ComA drives the expression of genetic competence genes, while RapF inhibits the interaction of ComA with its target promoters. The signaling peptide PhrF accumulates at high cell density and upregulates genetic competence by antagonizing the interaction of RapF and ComA. How RapF functions mechanistically to inhibit ComA activity and how PhrF in turn antagonizes the RapF-ComA interaction were unknown. Here we present the X-ray crystal structure of RapF in complex with the ComA DNA binding domain. Along with biochemical and genetic studies, the X-ray crystal structure reveals how RapF mechanistically regulates ComA function. Interestingly, we found that a RapF surface mimics DNA to block ComA binding to its target promoters. Furthermore, RapF is a monomer either alone or in complex with PhrF, and it undergoes a conformational change upon binding to PhrF, which likely causes the dissociation of ComA from the RapF-ComA complex. Finally, we compare the structure of RapF complexed with the ComA DNA binding domain and the structure of RapH complexed with Spo0F. This comparison reveals that RapF and RapH have strikingly similar overall structures, and that they have evolved different, non-overlapping surfaces to interact with diverse cellular targets. To our knowledge, the data presented here reveal the first atomic level insight into the inhibition of response regulator DNA binding by an anti-activator. Compounds that affect the interaction of Rap and Rap-like proteins with their target domains could serve to regulate medically and commercially important phenotypes in numerous Bacillus species, such as sporulation in B. anthracis and sporulation and the production of Cry protein endotoxin in B. thuringiensis.


    Organizational Affiliation

    Department of Microbiology and Molecular Genetics, UMDNJ-New Jersey Medical School, Newark, New Jersey, United States of America.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Response regulator aspartate phosphatase F
A
383Bacillus subtilis (strain 168)Gene Names: rapF (ywhJ)
EC: 3.1.-.-
Find proteins for P71002 (Bacillus subtilis (strain 168))
Go to UniProtKB:  P71002
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Transcriptional regulatory protein ComA
B
90Bacillus subtilis (strain 168)Gene Names: comA (comA1, comAA)
Find proteins for P14204 (Bacillus subtilis (strain 168))
Go to UniProtKB:  P14204
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

Download SDF File 
Download CCD File 
A
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.189 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 115.304α = 90.00
b = 81.437β = 90.00
c = 78.346γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
DENZOdata reduction
SCALEPACKdata scaling
PHENIXrefinement
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-01-04
    Type: Initial release
  • Version 1.1: 2012-01-25
    Type: Database references