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. 1991 Dec 25;19(24):6943–6948. doi: 10.1093/nar/19.24.6943

Potassium permanganate as an in situ probe for B-Z and Z-Z junctions.

H Jiang 1, W Zacharias 1, S Amirhaeri 1
PMCID: PMC329332  PMID: 1662368

Abstract

The availability of DNA structural probes that can be applied to living cells is essential for the analysis of biological functions of unusual DNA structures adopted in vivo. We have developed a chemical probe assay to detect and quantitate left-handed Z-DNA structures in recombinant plasmids in growing E. coli cells. Potassium permanganate selectively reacts with B-Z or Z-Z junction regions in supercoiled plasmids harbored in the cells. Restriction enzyme recognition sites located at these junctions are not cleaved by the corresponding endonuclease after modification with KMnO4. This inhibition of cleavage allows the determination of the relative amounts of B- and Z-forms of the cloned inserts inside the cell. We have successfully applied this method to monitor the extent of Z-DNA formation in E. coli as a function of the growth phase and mutated topoisomerase or gyrase activities. The assay can in principle be used for any unusual DNA structure that contains a restriction recognition site inside or near the structural alteration. It can be a useful tool to analyze in vivo correlations between DNA structure and gene regulatory events.

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