Abstract
DNA topoisomerase II (EC 5.99.1.3) is a ubiquitous Mg2+- and ATP-dependent enzyme that exists as a homodimer in eukaryotes (subunit molecular mass 131-180 kDa) and is encoded on human chromosome #17. This enzyme changes the linking number of DNA in steps of two and allows the interconversion of topological isomers of DNA by introducing a transient enzyme-bridged double-strand DNA break. Further details regarding the interaction of type II topoisomerases with DNA can be found in several recent reviews [1–6]. This enzyme has been purified to homogeneity from human Hela cells [7], Saccharomyces cerevisiae [8], Drosophila melanogaster [9], calf thymus [10–12], Trypanosoma cruzi [13], mouse leukemia P388 cells [14], Crithidia fasciculata [15], and Chinese hamster ovary cells [16]; and the gene has been cloned and sequenced from Saccharomyces cerevisiae [17], Schizosaccharomyces pombe [18], Drosophila melanogaster [19], HeLa cells [20], and human Burkitt lymphoma cells [21].
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Sullivan, D.M., Ross, W.E. (1991). Resistance to inhibitors of DNA topoisomerases. In: Ozols, R.F. (eds) Molecular and Clinical Advances in Anticancer Drug Resistance. Cancer Treatment and Research, vol 57. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3872-1_4
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