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Volume 162, Issue 6

Editor's Choice ClpXP and ClpAP control the division protein ZapC by proteolysis Free

Abstract

The bacterial FtsZ-ring is an essential cytokinetic structure under tight spatiotemporal regulation. In , FtsZ polymerization and assembly into the Z-ring is controlled on multiple levels through interactions with positive and negative regulators. Among these regulatory factors are ZapC, a Z-ring stabilizer, and the conserved protease ClpXP, which has been shown to degrade FtsZ protofilaments in preference to FtsZ monomers. Here we report that ZapC and ClpX interact in a protein–protein interaction assay, and that ZapC is degraded in a ClpXP-dependent manner . The SspB adaptor protein is not required for targeting ZapC to the ClpXP proteolytic machinery. A mutation disrupting the -like sequence () stabilizes ZapC consistent with a reduction in ClpXP-mediated ZapC degradation. ZapC retains the ability to interact with FtsZ and to promote bundling indicating that WT ZapC contains discrete FtsZ and ClpX recognition motifs. Additionally, ClpAP complexes are sufficient for degradation of ZapC in the absence of ClpX . Further, chromosomal expression of suppresses filamentation of the temperature-sensitive mutant, confirming the role of ZapC as a Z-ring stabilizer. Lastly, changes in ClpXP and ZapC levels lead to cell division effects, likely through their roles in modulating FtsZ assembly dynamics. Taken together, our results indicate that the Z-ring stabilizer ZapC is a substrate of both ClpXP and ClpAP Our data also point to a more complex regulatory circuit that integrates FtsZ, ClpXP and ZapC in achieving Z-ring stability in and related species.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): proteolysis
© 2016 The Authors
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2016-06-01
2024-04-24
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ClpXP and ClpAP control the Escherichia coli division protein ZapC by proteolysis
Microbiology 162, 909 (2016); https://doi.org/10.1099/mic.0.000278
/content/journal/micro/10.1099/mic.0.000278
/content/journal/micro/10.1099/mic.0.000278
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