Abstract
The maintenance of rod-cell shape in many bacteria depends on actin-like MreB proteins and several membrane proteins that interact with MreB. Using superresolution microscopy, we show that at 50-nm resolution, Bacillus subtilis MreB forms filamentous structures of length up to 3.4 μm underneath the cell membrane, which run at angles diverging up to 40° relative to the cell circumference. MreB from Escherichia coli forms at least 1.4-μm-long filaments. MreB filaments move along various tracks with a maximal speed of 85 nm/s, and the loss of ATPase activity leads to the formation of extended and static filaments. Suboptimal growth conditions lead to formation of patch-like structures rather than extended filaments. Coexpression of wild-type MreB with MreB mutated in the subunit interface leads to formation of shorter MreB filaments and a strong effect on cell shape, revealing a link between filament length and cell morphology. Thus MreB has an extended-filament architecture with the potential to position membrane proteins over long distances, whose localization in turn may affect the shape of the cell wall.
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Dates
Type | When |
---|---|
Created | 12 years, 2 months ago (June 19, 2013, 11:57 p.m.) |
Deposited | 5 years, 1 month ago (July 28, 2020, 4:21 p.m.) |
Indexed | 4 months, 2 weeks ago (April 17, 2025, 9:29 a.m.) |
Issued | 12 years, 1 month ago (Aug. 1, 2013) |
Published | 12 years, 1 month ago (Aug. 1, 2013) |
Published Print | 12 years, 1 month ago (Aug. 1, 2013) |
@article{Reimold_2013, title={Motion of variable-length MreB filaments at the bacterial cell membrane influences cell morphology}, volume={24}, ISSN={1939-4586}, url={http://dx.doi.org/10.1091/mbc.e12-10-0728}, DOI={10.1091/mbc.e12-10-0728}, number={15}, journal={Molecular Biology of the Cell}, publisher={American Society for Cell Biology (ASCB)}, author={Reimold, Christian and Defeu Soufo, Herve Joel and Dempwolff, Felix and Graumann, Peter L.}, editor={Pollard, Thomas D.}, year={2013}, month=aug, pages={2340–2349} }