ZapA and ZapB form an FtsZ-independent structure at midcell

Jackson A. Buss, Nick T. Peters, Jie Xiao, Thomas G. Bernhardt

Research output: Contribution to journalArticlepeer-review


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 SulA, ZapA remained at midcell as a cloud-like accumulation. Using ZapA(N60Y), a variant defective for interaction with FtsZ, it was established that these ZapA structures form without a connection to the Z-ring. Furthermore, midcell accumulations of GFP-ZapA(N60Y) often preceded Z-rings at midcell and required ZapB to assemble, suggesting that ZapB polymers form the foundation of these structures. In the absence of MatP, a DNA-binding protein that links ZapB to the chromosomal terminus region, cloud-like ZapA structures still formed but failed to track with the chromosome terminus and did not consistently precede FtsZ at midcell. Taken together, the results suggest that FtsZ-independent structures of ZapA–ZapB provide additional positional cues for Z-ring formation and may help coordinate its assembly with chromosome replication and segregation.

Original languageEnglish (US)
Pages (from-to)652-663
Number of pages12
JournalMolecular Microbiology
Issue number4
StatePublished - May 2017

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology


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