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• W2972693676 abstract "Abstract Gram-positive bacteria divide by forming a thick cross wall. How the thickness of this septal wall is controlled is unknown. In this type of bacteria, the key cell division protein FtsZ is anchored to the cell membrane by two proteins, FtsA and SepF. We have isolated SepF homologues from different bacterial species and found that they all polymerize into large protein rings with diameters varying from 19 to 41 nm. Importantly, these values correlated well with the thickness of their septa. To test whether ring diameter determines septal thickness, we tried to construct different SepF chimeras with the purpose to manipulate the diameter of the SepF protein ring. This was indeed possible and confirmed that the conserved core domain of SepF determines ring diameter. Importantly, when SepF chimeras with a smaller diameter were expressed in the bacterial host Bacillus subtilis , the thickness of its septa also became smaller. These results strongly support a model in which septal thickness is controlled by curved molecular clamps formed by SepF polymers attached to the leading edge of nascent septa. This also implies that the intrinsic shape of a protein polymer can function as a mould to shape the cell wall. Significance Statement Many bacteria form a thick cell wall and divide by forming a cross wall. How they control the thickness of their cell wall and cross wall is unknown. In this study we show that in these bacteria the cell division protein SepF forms very large protein rings with diameters that correspond to the diameter of their cross walls. Importantly, when we reduced the diameter of SepF rings in the bacterial host Bacillus subtilis the cross wall also became thinner. These results provide strong evidence that a large protein ring can function as a mould to control the thickness of the cell wall that divides these bacterial cells." @default.
• W2972693676 created "2019-09-19" @default.
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• W2972693676 date "2019-09-16" @default.
• W2972693676 modified "2023-09-26" @default.
• W2972693676 title "Controlling septum thickness by a large protein ring" @default.
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• W2972693676 doi "https://doi.org/10.1101/771139" @default.
• W2972693676 hasPublicationYear "2019" @default.
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