4TPS

Sporulation Inhibitor of DNA Replication, SirA, in complex with Domain I of DnaA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.126 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure and interactions of the Bacillus subtilis sporulation inhibitor of DNA replication, SirA, with domain I of DnaA.

Jameson, K.H.Rostami, N.Fogg, M.J.Turkenburg, J.P.Grahl, A.Murray, H.Wilkinson, A.J.

(2014) Mol.Microbiol. 93: 975-991

  • DOI: 10.1111/mmi.12713

  • PubMed Abstract: 
  • Chromosome copy number in cells is controlled so that the frequency of initiation of DNA replication matches that of cell division. In bacteria, this is achieved through regulation of the interaction between the initiator protein DnaA and specific DN ...

    Chromosome copy number in cells is controlled so that the frequency of initiation of DNA replication matches that of cell division. In bacteria, this is achieved through regulation of the interaction between the initiator protein DnaA and specific DNA elements arrayed at the origin of replication. DnaA assembles at the origin and promotes DNA unwinding and the assembly of a replication initiation complex. SirA is a DnaA-interacting protein that inhibits initiation of replication in diploid Bacillus subtilis cells committed to the developmental pathway leading to formation of a dormant spore. Here we present the crystal structure of SirA in complex with the N-terminal domain of DnaA revealing a heterodimeric complex. The interacting surfaces of both proteins are α-helical with predominantly apolar side-chains packing in a hydrophobic interface. Site-directed mutagenesis experiments confirm the importance of this interface for the interaction of the two proteins in vitro and in vivo. Localization of GFP-SirA indicates that the protein accumulates at the replisome in sporulating cells, likely through a direct interaction with DnaA. The SirA interacting surface of DnaA corresponds closely to the HobA-interacting surface of DnaA from Helicobacter pylori even though HobA is an activator of DnaA and SirA is an inhibitor.


    Organizational Affiliation

    Structural Biology Laboratory, Department of Chemistry, University of York, York, YO10 5DD, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Sporulation inhibitor of replication protein SirA
A, C
154Bacillus subtilis (strain 168)Mutation(s): 0 
Gene Names: sirA (yneE, yoxF)
Find proteins for P45707 (Bacillus subtilis (strain 168))
Go to UniProtKB:  P45707
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Chromosomal replication initiator protein DnaA
B, D
85Bacillus subtilis (strain 168)Mutation(s): 0 
Gene Names: dnaA (dnaH)
Find proteins for P05648 (Bacillus subtilis (strain 168))
Go to UniProtKB:  P05648
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download SDF File 
Download CCD File 
A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
BME
Query on BME

Download SDF File 
Download CCD File 
A, C
BETA-MERCAPTOETHANOL
C2 H6 O S
DGVVWUTYPXICAM-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.126 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 77.287α = 90.00
b = 34.685β = 102.09
c = 84.735γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-07-30
    Type: Initial release
  • Version 1.1: 2014-09-10
    Type: Database references