Rules and Exceptions: The Role of Chromosomal ParB in DNA Segregation and Other Cellular Processes

Overview

Journal Microorganisms

Specialty Microbiology

Date 2020 Jan 17

PMID 31940850

Citations 24

Authors

Adam Kawalek

Pawel Wawrzyniak

Aneta Agnieszka Bartosik

Grazyna Jagura-Burdzy

Affiliations

Soon will be listed here.

Abstract

The segregation of newly replicated chromosomes in bacterial cells is a highly coordinated spatiotemporal process. In the majority of bacterial species, a tripartite ParAB- system, composed of an ATPase (ParA), a DNA-binding protein (ParB), and its target(s) sequence(s), facilitates the initial steps of chromosome partitioning. ParB nucleates around (s) located in the vicinity of newly replicated s to form large nucleoprotein complexes, which are subsequently relocated by ParA to distal cellular compartments. In this review, we describe the role of ParB in various processes within bacterial cells, pointing out interspecies differences. We outline recent progress in understanding the ParB nucleoprotein complex formation and its role in DNA segregation, including ori positioning and anchoring, DNA condensation, and loading of the structural maintenance of chromosome (SMC) proteins. The auxiliary roles of ParBs in the control of chromosome replication initiation and cell division, as well as the regulation of gene expression, are discussed. Moreover, we catalog ParB interacting proteins. Overall, this work highlights how different bacterial species adapt the DNA partitioning ParAB- system to meet their specific requirements.

Citing Articles

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Phase-separated ParB enforces diverse DNA compaction modes and stabilizes the parS-centered partition complex.

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