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Cell division in Escherichia coli begins with the polymerization of FtsZ into a ring‐like structure, the Z‐ring, at midcell. All other division proteins are thought to require the Z‐ring for recruitment to the future division site. Here, it is reported that the Z‐ring associated proteins ZapA and ZapB form FtsZ‐independent structures at midcell. Upon Z‐ring disruption by the FtsZ polymerization antagonist...
RecG is a member of the superfamily 2 helicase family. Its possible role in vivo is ATP hydrolysis driven regression of stalled replication forks. To gain mechanistic insight into how this is achieved, a coupled spectrophotometric assay was utilized to characterize the ATPase activity of RecG in vitro. The results demonstrate an overwhelming preference for negatively supercoiled DNA ((−)scDNA) as...
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