Stage III sporulation protein AB (SpoIIIAB)

Experimental Data Snapshot

  • Resolution: 2.32 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.209 

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Structural characterization of SpoIIIAB sporulation-essential protein in Bacillus subtilis.

Zeytuni, N.Flanagan, K.A.Worrall, L.J.Massoni, S.C.Camp, A.H.Strynadka, N.C.J.

(2018) J Struct Biol 202: 105-112

  • DOI: https://doi.org/10.1016/j.jsb.2017.12.009
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Endospore formation in the Gram-positive bacterium Bacillus subtilis initiates in response to nutrient depletion and involves a series of morphological changes that result in the creation of a dormant spore. Early in this developmental process, the cell undergoes an asymmetric cell division that produces the larger mother cell and smaller forespore, the latter destined to become the mature spore. The mother cell septal membrane then engulfs the forespore, at which time an essential channel, the so-called feeding-tube apparatus, is thought to cross both membranes to create a direct conduit between the cells. At least nine proteins are required to form this channel including SpoIIQ under forespore control and SpoIIIAA-AH under the mother cell control. Several of these proteins share similarity to components of Type-II, -III and -IV secretion systems as well as the flagellum from Gram-negative bacteria. Here we report the X-ray crystallographic structure of the cytosolic domain of SpoIIIAB to 2.3 Å resolution. This domain adopts a conserved, secretion-system related fold of a six membered anti-parallel helical bundle with a positively charged membrane-interaction face at one end and a small groove at the other end that may serve as a binding site for partner proteins in the assembled apparatus. We analyzed and identified potential interaction interfaces by structure-guided mutagenesis in vivo. Furthermore, we were able to identify a remarkable structural homology to the C-subunit of a bacterial V-ATPase. Collectively, our data provides new insight into the possible roles of SpoIIIAB protein within the secretion-like apparatus essential to bacterial sporulation.

  • Organizational Affiliation

    Department of Biological Sciences, Mount Holyoke College, South Hadley, MA, USA. Electronic address: acamp@mtholyoke.edu.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Stage III sporulation protein AB
A, B, C, D
130Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: spoIIIABBSU24420
Find proteins for Q01368 (Bacillus subtilis (strain 168))
Explore Q01368 
Go to UniProtKB:  Q01368
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ01368
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.32 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.209 
  • Space Group: P 21 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.54α = 90
b = 82β = 90
c = 84.75γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling
PDB_EXTRACTdata extraction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-01-17
    Type: Initial release
  • Version 1.1: 2018-04-04
    Changes: Data collection, Database references