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. 1988 Mar 25;16(5 Pt B):2015–2030. doi: 10.1093/nar/16.5.2015

The interaction of Escherichia coli integration host factor with the cohesive end sites of phages lambda and 21.

W N Xin 1, M Feiss 1
PMCID: PMC338196  PMID: 2965807

Abstract

The interaction of E. coli integration host factor (IHF) with the cohesive end sites (cos's) of phages lambda and 21 has been studied by the DNAase I footprinting technique. Six potential sites in cos lambda differ from the consensus IHF binding sequence by 1 to 3 base pairs. Of the six, one site, I1, binds IHF strongly. The I1 segment protected by IHF contains two sequences that closely match the IHF consensus binding sequence. Another site, I2, binds IHF moderately well, and three sites: 10', 13 and 14 bind IHF very weakly. The 10 site does not bind IHF under the conditions used here. In phage 21 the DNA segment extending to the right from the cohesive ends, which contains three potential IHF binding sites, was examined. Two sites bind IHF well; I1, the 21 analogue of one of the lambda I1 sites, and I0, a site not analogous to a lambda site. The third 21 site, I2, binds IHF moderately well, as does the analogous I2 site in lambda. The significance of the results for lambda DNA packaging is discussed.

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Selected References

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