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
Virologyjournal_title
Virologyauthors
Kaur T,Al Abdallah Q,Nafissi N,Wettig S,Funnell BE,Slavcev RAdoi
10.1016/j.virol.2011.09.027subject
Has Abstractpub_date
2011-12-20 00:00:00pages
192-201issue
2eissn
0042-6822issn
1096-0341pii
S0042-6822(11)00455-7journal_volume
421pub_type
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