3UZ0

Crystal Structure of SpoIIIAH and SpoIIQ Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.82 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of the basal components of a bacterial transporter.

Meisner, J.Maehigashi, T.Andre, I.Dunham, C.M.Moran, C.P.

(2012) Proc.Natl.Acad.Sci.USA 109: 5446-5451

  • DOI: 10.1073/pnas.1120113109

  • PubMed Abstract: 
  • Proteins SpoIIQ and SpoIIIAH interact through two membranes to connect the forespore and the mother cell during endospore development in the bacterium Bacillus subtilis. SpoIIIAH consists of a transmembrane segment and an extracellular domain with si ...

    Proteins SpoIIQ and SpoIIIAH interact through two membranes to connect the forespore and the mother cell during endospore development in the bacterium Bacillus subtilis. SpoIIIAH consists of a transmembrane segment and an extracellular domain with similarity to YscJ proteins. YscJ proteins form large multimeric rings that are the structural scaffolds for the assembly of type III secretion systems in gram-negative bacteria. The predicted ring-forming motif of SpoIIIAH and other evidence led to the model that SpoIIQ and SpoIIIAH form the core components of a channel or transporter through which the mother cell nurtures forespore development. Therefore, to understand the roles of SpoIIIAH and SpoIIQ in channel formation, it is critical to determine whether SpoIIIAH adopts a ring-forming structural motif, and whether interaction of SpoIIIAH with SpoIIQ would preclude ring formation. We report a 2.8-Å resolution structure of a complex of SpoIIQ and SpoIIIAH. SpoIIIAH folds into the ring-building structural motif, and modeling shows that the structure of the SpoIIQ-SpoIIIAH complex is compatible with forming a symmetrical oligomer that is similar to those in type III systems. The inner diameters of the two most likely ring models are large enough to accommodate several copies of other integral membrane proteins. SpoIIQ contains a LytM domain, which is found in metalloendopeptidases, but lacks residues important for metalloprotease activity. Other LytM domains appear to be involved in protein-protein interactions. We found that the LytM domain of SpoIIQ contains an accessory region that interacts with SpoIIIAH.


    Organizational Affiliation

    Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, GA 30322, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Stage III sporulation protein AH
A, C
133Bacillus subtilis (strain 168)Mutation(s): 0 
Gene Names: spoIIIAH
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Intercellular
Protein: 
SpoIIQ-SpoIIIAH Complex
Find proteins for P49785 (Bacillus subtilis (strain 168))
Go to UniProtKB:  P49785
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Stage II sporulation protein Q
B, D
152Bacillus subtilis (strain 168)Mutation(s): 0 
Gene Names: spoIIQ (ywnI)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Intercellular
Protein: 
SpoIIQ-SpoIIIAH Complex
Find proteins for P71044 (Bacillus subtilis (strain 168))
Go to UniProtKB:  P71044
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, C, D
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C, D
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.82 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.208 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 62.370α = 90.00
b = 64.490β = 90.00
c = 176.560γ = 90.00
Software Package:
Software NamePurpose
PHENIXphasing
HKL-2000data reduction
PHENIXrefinement
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-03-21
    Type: Initial release
  • Version 1.1: 2012-04-25
    Type: Database references
  • Version 1.2: 2017-11-08
    Type: Refinement description