SMC modulates ParB engagement in segregation complexes in streptomyces.

ABSTRACT: ParB is a bacterial chromosome segregation protein with recently demonstrated CTPase activity. CTP-bound ParB homodimers are loaded onto DNA at parS sites and spread along DNA, forming a large nucleoprotein complex. ParB complexes recruit condensin (SMC protein). Whether SMC modulates ParB complexes has remained unknown. Here, we employ Streptomyces venezuelae strains producing ParB-HaloTag in the presence or absence of SMC and use single-cell time-lapse fluorescence microscopy, single molecule tracking and fluorescence recovery after photobleaching analyses to explore ParB dynamics. Additionally, we perform chromatin immunoprecipitation to examine ParB interactions with DNA, with or without SMC. We reveal that SMC modulates ParB complex stability and ParB mobility. We find that the absenc

SUBMITTER: Pawlikiewicz K 

PROVIDER: S-EPMC12511625 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature