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• W4285677382 abstract "Abstract FtsK/SpoIIIE protein family are DNA translocases known as the fastest DNA motor proteins that use ATP for their movement on DNA. Most of the studies in single chromosome-containing bacteria have established the role of FtsK in chromosome dimer resolution (CDR) connecting the bacterial chromosome segregation process with cell division. But, only limited reports are available on the interdependent regulation of genome segregation and cell division in multipartite genome harbouring (MGH) bacteria. In this study, for the first time, we report the characterization of FtsK from the radioresistant MGH bacterium Deinococcus radiodurans R1 (drFtsK). drFtsK shows the activity characteristics of a typical FtsK/SpoIIIE/Tra family. It stimulates the site-specific recombination catalyzed by Escherichia coli tyrosine recombinases. drFtsK interacts with various cell division and genome segregation proteins of D. radiodurans . Microscopic examination of different domain deletion mutants of this protein reveals alterations in cellular membrane architecture and nucleoid morphology. In-vivo localization studies of drFtsK-RFP show that it forms multiple foci on nucleoid as well as on the membrane with maximum density on the septum. drFtsK coordinates its movement with nucleoid separation. The alignment of its foci shifts from old to new septum indicating its cellular dynamics with the FtsZ ring during the cell division process. Nearly, similar positional dynamicity of FtsK was observed in cells recovering from gamma radiation exposure. These results suggest that FtsK forms a part of chromosome segregation, cell envelope, and cell division machinery in D. radiodurans . Importance Deinococcus radiodurans show extraordinary resistance to γ-radiation. It is polyploid and harbours a multipartite genome comprised of two chromosomes and two plasmids, packaged in a doughnut-shaped toroidal nucleoid. Very little is known about how the tightly packed genome is accurately segregated and the next divisional plane is determined. FtsK, a multifunctional protein, helps in pumping the septum-trapped DNA in several bacteria. Here, we characterized FtsK of D. radiodurans R1 (drFtsK) for the first time and showed it to be an active protein. The absence of drFtsK causes many defects in morphology at both cellular and nucleoid levels. The compact packaging of the deinococcal genome and cell membrane formation is hindered in ftsK mutants. In-vivo drFtsK is dynamic, forms foci on both nucleoid and septum, and coordinates with FtsZ for the next cell division. Thus, drFtsK role in maintaining the normal genome phenotype and cell division in Deinococcus radiodurans is suggested." @default.
• W4285677382 created "2022-07-17" @default.
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• W4285677382 date "2022-07-16" @default.
• W4285677382 modified "2023-10-05" @default.
• W4285677382 title "FtsK, a DNA motor protein, coordinates the genome segregation and early cell division processes in <i>Deinococcus radiodurans</i>" @default.
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• W4285677382 doi "https://doi.org/10.1101/2022.07.15.500248" @default.
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