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TitleA ring-shaped conduit connects the mother cell and forespore during sporulation in Bacillus subtilis.
Journal, issue, pagesProc Natl Acad Sci U S A, Vol. 113, Issue 41, Page 11585-11590, Year 2016
Publish dateOct 11, 2016
AuthorsChristopher D A Rodrigues / Xavier Henry / Emmanuelle Neumann / Vilius Kurauskas / Laure Bellard / Yann Fichou / Paul Schanda / Guy Schoehn / David Z Rudner / Cecile Morlot /
PubMed AbstractDuring spore formation in Bacillus subtilis a transenvelope complex is assembled across the double membrane that separates the mother cell and forespore. This complex (called the "A-Q complex") is ...During spore formation in Bacillus subtilis a transenvelope complex is assembled across the double membrane that separates the mother cell and forespore. This complex (called the "A-Q complex") is required to maintain forespore development and is composed of proteins with remote homology to components of type II, III, and IV secretion systems found in Gram-negative bacteria. Here, we show that one of these proteins, SpoIIIAG, which has remote homology to ring-forming proteins found in type III secretion systems, assembles into an oligomeric ring in the periplasmic-like space between the two membranes. Three-dimensional reconstruction of images generated by cryo-electron microscopy indicates that the SpoIIIAG ring has a cup-and-saucer architecture with a 6-nm central pore. Structural modeling of SpoIIIAG generated a 24-member ring with dimensions similar to those of the EM-derived saucer. Point mutations in the predicted oligomeric interface disrupted ring formation in vitro and impaired forespore gene expression and efficient spore formation in vivo. Taken together, our data provide strong support for the model in which the A-Q transenvelope complex contains a conduit that connects the mother cell and forespore. We propose that a set of stacked rings spans the intermembrane space, as has been found for type III secretion systems.
External linksProc Natl Acad Sci U S A / PubMed:27681621 / PubMed Central
MethodsEM (single particle)
Resolution35.0 Å
Structure data

EMDB-4072:
Cryo-EM 3D reconstruction of rings formed by the extracellular domain of SpoIIIAG from Bacillus subtilis
Method: EM (single particle) / Resolution: 35.0 Å

Source
  • Bacillus subtilis subsp. subtilis str. 168 (bacteria)

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