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- W3091897316 abstract "The Archaea present profound differences compared to Bacteria in fundamental molecular and cellular processes. While most Archaea divide by binary fission using an FtsZ-based system similar to Bacteria, they lack the majority of the components forming the complex bacterial divisome. Moreover, how FtsZ precisely functions and interacts with other proteins to assemble the archaeal division machinery remains largely unknown. Notably, among the multiple bacterial factors that tether FtsZ to the membrane during cell constriction, Archaea only possess SepF-like homologues, but their function has not been demonstrated. Here, we combine structural, cellular, and evolutionary approaches to demonstrate that SepF is the FtsZ anchor in the human-associated archaeon Methanobrevibacter smithii . 3D super-resolution microscopy of immunolabeled cells shows that M. smithii SepF co-localizes with FtsZ at the division plane. We also show that M. smithii SepF binds both to membranes and FtsZ, inducing filament bundling. High-resolution crystal structures of archaeal SepF alone and in complex with FtsZ CTD reveal that SepF forms a dimer with a specific homodimerization interface. This drives a strikingly different binding mode from what is observed in Bacteria. Finally, analysis of the distribution and phylogeny of SepF and FtsZ indicates that these proteins date back to the Last Universal Common Ancestor (LUCA) and that Archaea may have retained features of an ancestral minimal cell division system, while Bacteria likely diverged to accommodate the emergence of the complex machinery required to coordinate cytokinesis with the rigid peptidoglycan cell wall and the appearance of additional FtsZ tethers. Our results contribute key insights into the largely understudied mechanisms of archaeal cell division, and pave the way for a better understanding of the processes underlying the divide between the two prokaryotic domains." @default.
- W3091897316 created "2020-10-15" @default.
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- W3091897316 date "2020-10-06" @default.
- W3091897316 modified "2023-10-01" @default.
- W3091897316 title "SepF is the FtsZ-anchor in Archaea: implications for cell division in the Last Universal Common Ancestor" @default.
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- W3091897316 doi "https://doi.org/10.1101/2020.10.06.328377" @default.
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