ParAB-mediated intermolecular association of plasmid P1 parS sites.

Abstract:

:The P1 plasmid partition system depends on ParA-ParB proteins acting on centromere-like parS sites for a faithful plasmid segregation during the Escherichia coli cell cycle. In vivo we placed parS into host E. coli chromosome and on a Sop(+) F plasmid and found that the stability of a P1 plasmid deleted for parA-parB could be partially restored when parB was expressed in trans. In vitro, parS, conjugated to magnetic beads could capture free parS DNA fragment in presence of ParB. In vitro, ParA stimulated ParB-mediated association of intermolecular parS sites in an ATP-dependent manner. However, in the presence of ADP, ParA reduced ParB-mediated pairing to levels below that seen by ParB alone. ParB of P1 pairs the parS sites of plasmids in vivo and fragments in vitro. Our findings support a model whereby ParB complexes P1 plasmids, ParA-ATP stimulates this interaction and ParA-ADP inhibits ParB pairing activity in a parS-independent manner.

journal_name

Virology

journal_title

Virology

authors

Kaur T,Al Abdallah Q,Nafissi N,Wettig S,Funnell BE,Slavcev RA

doi

10.1016/j.virol.2011.09.027

subject

Has Abstract

pub_date

2011-12-20 00:00:00

pages

192-201

issue

2

eissn

0042-6822

issn

1096-0341

pii

S0042-6822(11)00455-7

journal_volume

421

pub_type

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