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2016 ; 7
(ä): 10200
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Multistep assembly of DNA condensation clusters by SMC
#MMPMID26725510
Kim H
; Loparo JJ
Nat Commun
2016[Jan]; 7
(ä): 10200
PMID26725510
show ga
SMC (structural maintenance of chromosomes) family members play essential roles
in chromosome condensation, sister chromatid cohesion and DNA repair. It remains
unclear how SMCs structure chromosomes and how their mechanochemical cycle
regulates their interactions with DNA. Here we used single-molecule fluorescence
microscopy to visualize how Bacillus subtilis SMC (BsSMC) interacts with
flow-stretched DNAs. We report that BsSMC can slide on DNA, switching between
static binding and diffusion. At higher concentrations, BsSMCs form clusters that
condense DNA in a weakly ATP-dependent manner. ATP increases the apparent
cooperativity of DNA condensation, demonstrating that BsSMC can interact
cooperatively through their ATPase head domains. Consistent with these results,
ATPase mutants compact DNA more slowly than wild-type BsSMC in the presence of
ATP. Our results suggest that transiently static BsSMC molecules can nucleate the
formation of clusters that act to locally condense the chromosome while forming
long-range DNA bridges.