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A joint-ParB interface promotes Smc DNA recruitment.

Florian P Bock1, Hon Wing Liu1, Anna Anchimiuk1

  • 1Department of Fundamental Microbiology (DMF), Faculty of Biology and Medicine (FBM), University of Lausanne, 1015 Lausanne, Switzerland.

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Summary

Bacterial SMC complexes and ParB proteins form a functional module for organizing and segregating foreign chromosomes. ParB directly binds the Smc subunit, initiating DNA loop extrusion for chromosome organization.

Keywords:
CP: molecular biologyDNA loop extrusionParABSParBScpAScpBSpo0Jchromosome segregationcondensinparSsmc

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Area of Science:

  • Molecular Biology
  • Microbiology
  • Genetics

Background:

  • Cell division requires precise organization and segregation of long DNA molecules.
  • Structural Maintenance of Chromosomes (SMC) complexes are key players in DNA organization via loop extrusion.
  • In bacteria, chromosome organization often initiates at partition complexes like ParB/parS.

Purpose of the Study:

  • To investigate the interaction between SMC complexes and partition complexes in bacterial chromosome organization.
  • To determine if bacterial SMC complexes and ParB proteins can organize and segregate foreign chromosomes.
  • To elucidate the molecular mechanism of DNA organization initiation by SMC and ParB.

Main Methods:

  • Gene replacement experiments using Bacillus subtilis and Streptococcus pneumoniae orthologs.
  • Construction and analysis of chimeric Smc-ParB proteins.
  • Chemical cross-linking to identify protein-protein interaction interfaces.
  • Structure prediction modeling.

Main Results:

  • The three subunits of bacterial Smc complex and ParB protein form a functional module capable of organizing and segregating foreign chromosomes.
  • Direct binding between ParB and the Smc subunit was confirmed.
  • A specific binding interface was mapped to the Smc joint and the ParB CTP-binding domain.
  • Structural predictions suggest ParB presents DNA to Smc, initiating loop extrusion.

Conclusions:

  • Bacterial Smc complexes and ParB proteins function as an integrated module for chromosome organization and segregation.
  • ParB directly interacts with Smc, mediating the initiation of DNA loop extrusion at partition sites.
  • This study provides mechanistic insights into how bacteria organize their chromosomes.