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. 1984 May;3(5):1187–1192. doi: 10.1002/j.1460-2075.1984.tb01949.x

The supercoil-stabilised cruciform of ColE1 is hyper-reactive to osmium tetroxide.

D M Lilley, E Palecek
PMCID: PMC557493  PMID: 6329743

Abstract

Supercoiled pColIR215 contains a site of pronounced hyper-reactivity towards modification by osmium tetroxide, a reagent known to be single-strand-selective. The site of hypersensitivity has been mapped to the ColE1 inverted repeat, believed to extrude a cruciform in supercoiled DNA. Linear or relaxed plasmids are not modified by the reagent. We conclude that cruciform formation is responsible for the site-selective modification. Fine mapping of the modification site as a function of time has revealed that the initial reaction occurs at the centre of the inverted repeat, i.e., the unpaired loop of the cruciform, but that the modification region rapidly expands outwards from this point.

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