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Abstract

Multi-subunit SMC complexes are required to perform essential functions, such as chromosome compaction, segregation and DNA repair, from bacteria to humans. Prokaryotic SMC proteins form complexes with two non-SMC subunits, ScpA and ScpB, to condense the chromosome. The mutants of both and genes in have been shown to display characteristic phenotypes such as growth defects and increased frequency of anucleate cells. Here, we studied the function of the Smc-ScpAB complex from . We observed no significant growth difference between the null mutant and wild-type under both standard and stress conditions. Furthermore, we characterized the Smc-ScpAB holocomplex from . The MsSMC consists of the dimerization hinge and ATPase head domains connected by long coiled-coils. The MsSMC interacts with two non-SMC proteins, ScpA and ScpB, and the resulting holocomplex binds to different DNA substrates independent of ATP. The Smc-ScpAB complex showed DNA-stimulated ATPase activity in the presence of ssDNA. A cytological profiling assay revealed that upon overexpression the Smc-ScpAB ternary complex compacts the decondensed nucleoid of rifampicin-treated wild-type and null mutant of . Together, our study suggests that has a functional Smc-ScpAB complex capable of DNA binding and condensation. Based on our observations, we speculate that the presence of alternative SMCs such as MksB or other SMC homologues might have rescued the mutant phenotype in .

Funding
This study was supported by the:
  • Department of Science and Technology, Ministry of Science and Technology (Award IFA13-LSBM85)
    • Principle Award Recipient: RaviKumar
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/content/journal/micro/10.1099/mic.0.001011
2020-12-22
2021-08-01
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