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. 1990 Dec;9(13):4555–4562. doi: 10.1002/j.1460-2075.1990.tb07908.x

Eukaryotic topoisomerases recognize nucleic acid topology by preferentially interacting with DNA crossovers.

E L Zechiedrich 1, N Osheroff 1
PMCID: PMC552253  PMID: 2176156

Abstract

Eukaryotic topoisomerases recognize DNA topology and preferentially react with positively or negatively supercoiled molecules over relaxed substrates. To elucidate the mechanism of this recognition, we examined the interaction of topoisomerases with DNA by electron microscopy. Under all conditions employed, approximately 90% of the bound type I or II enzyme was observed at points of helix--helix juxtaposition on negatively supercoiled plasmids which contained as few as four crossovers. Recognition was independent of torsional stress, as enzyme molecules were also found at crossovers on linear DNA. Since juxtaposed helices are more prevalent in supercoiled compared with relaxed nucleic acids, we propose that eukaryotic topoisomerases I and II recognize underwound or overwound substrates by interacting preferentially with DNA crossovers. This may represent a general mechanism for the recognition of DNA topology by proteins.

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