The DNA binding domains of P1 ParB and the architecture of the P1 plasmid partition complex

被引:50
作者
Surtees, JA [1 ]
Funnell, BE [1 ]
机构
[1] Univ Toronto, Dept Mol & Med Genet, Toronto, ON M5S 1A8, Canada
关键词
D O I
10.1074/jbc.M009370200
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Stable maintenance of P1 plasmids in Escherichia coli is mediated by a high affinity nucleoprotein complex called the partition complex, which consists of ParB and the E. coli integration host factor (IHF) bound specifically to the P1 parS site. IHF strongly stimulates ParB binding to parS, and the minimal partition complex contains a single dimer of ParB, To examine the architecture of the partition complex, we have investigated the DNA binding activity of various ParB fragments. Gel mobility shift and DNase I protection assays showed that the first 141 residues of ParB are dispensable for the formation of the minimal, high affinity partition complex. A fragment missing only the last 16 amino acids of ParB bound specifically to parS, but binding was weak and was no longer stimulated by IHF. The ability of IHF to stimulate ParB binding to parS correlated with the ability of ParB to dimerize via its C terminus. Using full and partial parS sites, we show that two regions of ParB, one in the center and the other near the C terminus of the protein, interact with distinct sequences within parS. Based on these data, we have proposed a model of how the ParB dimer binds parS to form the minimal partition complex.
引用
收藏
页码:12385 / 12394
页数:10
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