Site-specific cleavage of DNA by E. coli DNA gyrase - PubMed (original) (raw)
Site-specific cleavage of DNA by E. coli DNA gyrase
A Morrison et al. Cell. 1979 May.
Abstract
E. coli DNA gyrase, which catalyzes the supercoiling of DNA, cleaves DNA site-specifically when oxolinic acid and sodium dodecylsulfate are added to the reaction. We studied the structure of the gyrasecleaved DNA because of its implications for the reaction mechanism and biological role of gyrase. Gyrase made a staggered cut, creating DNA termini with a free 3' hydroxyl and a 5' extension that provided a template primer for DNA polymerase. The cleaved DNA was resistant to labeling with T4 polynucleotide kinase even after treatment with proteinase K. Thus the denatured enzyme that remains attached to cleaved DNA is covalently bonded to both 5' terminal extensions. The 5' extensions of many gyrase cleavage fragments from phi X174, SV40 and Col E1 DNA were partially sequenced using repair with E. coli DNA polymerase I. No unique sequence existed within the cohesive ends, but G was the predominant first base incorporated by DNA polymerase I. The cohesive and sequences of four gyrase sites were determined, and they demonstrated a four base 5' extension. The dinucleotide TG, straddling the gyrase cut on one DNA strand, provided the only common bases within a 100 bp region surrounding the cleavage sites. Analysis of other cleavage fragments showed that cutting between a TG doublet is common to most, or all, gyrase cleavages. Other bases common to some of the sequenced sites were clustered nonrandomly around the TG doublet, and may be variable components of the cleavage sequence. This diverse recognition sequence with common elements is a pattern shared with several other specific nucleic acid-protein interactions.
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