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Title: Visualization and functional dissection of coaxial paired SpoIIIE channels across the sporulation septum

Journal Article · · eLife
DOI:https://doi.org/10.7554/eLife.06474· OSTI ID:1180127
 [1];  [2];  [1];  [1];  [2];  [3];  [2]
  1. Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, United States
  2. Division of Biological Sciences, University of California, San Diego, La Jolla, United States
  3. Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, United States, Jason L Choy Laboratory of Single Molecule Biophysics, Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, United States, QB3 Institute, University of California, Berkeley, Berkeley, United States, Kavli Energy NanoSciences Institute, University of California, Berkeley, Berkeley, United States

SpoIIIE is a membrane-anchored DNA translocase that localizes to the septal midpoint to mediate chromosome translocation and membrane fission during Bacillus subtilis sporulation. Here we use cell-specific protein degradation and quantitative photoactivated localization microscopy in strains with a thick sporulation septum to investigate the architecture and function of the SpoIIIE DNA translocation complex in vivo. We were able to visualize SpoIIIE complexes with approximately equal numbers of molecules in the mother cell and the forespore. Cell-specific protein degradation showed that only the mother cell complex is required to translocate DNA into the forespore, whereas degradation in either cell reverses membrane fission. Our data suggest that SpoIIIE assembles a coaxially paired channel for each chromosome arm comprised of one hexamer in each cell to maintain membrane fission during DNA translocation. We show that SpoIIIE can operate, in principle, as a bi-directional motor that exports DNA.

Research Organization:
Univ. of California, Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences and Engineering Division; National Institutes of Health (NIH)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1180127
Alternate ID(s):
OSTI ID: 1184781; OSTI ID: 1197950
Journal Information:
eLife, Journal Name: eLife Vol. 4; ISSN 2050-084X
Publisher:
eLife Sciences Publications, Ltd.Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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