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Reconstitution of DNA segregation driven by assembly of a prokaryotic actin homolog.


ABSTRACT: Multiple unrelated polymer systems have evolved to partition DNA molecules between daughter cells at division. To better understand polymer-driven DNA segregation, we reconstituted the three-component segregation system of the R1 plasmid from purified components. We found that the ParR/parC complex can construct a simple bipolar spindle by binding the ends of ParM filaments, inhibiting dynamic instability, and acting as a ratchet permitting incorporation of new monomers and riding on the elongating filament ends. Under steady-state conditions, the dynamic instability of unattached ParM filaments provides the energy required to drive DNA segregation.

SUBMITTER: Garner EC 

PROVIDER: S-EPMC2851738 | biostudies-literature | 2007 Mar

REPOSITORIES: biostudies-literature

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Reconstitution of DNA segregation driven by assembly of a prokaryotic actin homolog.

Garner Ethan C EC   Campbell Christopher S CS   Weibel Douglas B DB   Mullins R Dyche RD  

Science (New York, N.Y.) 20070301 5816


Multiple unrelated polymer systems have evolved to partition DNA molecules between daughter cells at division. To better understand polymer-driven DNA segregation, we reconstituted the three-component segregation system of the R1 plasmid from purified components. We found that the ParR/parC complex can construct a simple bipolar spindle by binding the ends of ParM filaments, inhibiting dynamic instability, and acting as a ratchet permitting incorporation of new monomers and riding on the elongat  ...[more]

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2015-05-01 | GSE45906 | GEO