title: Physiological regulation of eukaryotic topoisomerase II.
abstract: Topoisomerase II is an essential enzyme in all organisms with several independent roles in DNA metabolism. In this article we review our knowledge on the regulation of the expression and catalytic activity of topoisomerase II in both lower and higher eukaryotes. Current data indicate that the regulation of topoisomerase II gene expression is complex, with positive and negative controls in evidence at the level of both promoter activity and mRNA stability. Similarly, the activity of the mature enzyme can be regulated by the action of several different protein kinases. Of particular interest is the cell cycle-dependent phosphorylation of topoisomerase II, including multiple, mitosis-specific modifications, which are proposed to regulate the essential chromosome decatenation activity of the enzyme.
authors.affiliation: Imperial Cancer Research Fund Laboratories, Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford, OX3 9DS, UK.
authors.forename: R J
authors.initials: RJ
authors.lastname: Isaacs
authors.forename: S L
authors.initials: SL
authors.lastname: Davies
authors.forename: M I
authors.initials: MI
authors.lastname: Sandri
authors.forename: C
authors.initials: C
authors.lastname: Redwood
authors.forename: N J
authors.initials: NJ
authors.lastname: Wells
authors.forename: I D
authors.initials: ID
authors.lastname: Hickson
mesh_terms: D000818:Animals; D001483:Base Sequence; D002453:Cell Cycle / Q000502:physiology; D004247:DNA / Q000378:metabolism; D004250:DNA Topoisomerases, Type II / Q000502:physiology*; D005057:Eukaryotic Cells; D015971:Gene Expression Regulation, Enzymologic / Q000235:genetics*; D008322:Mammals; D008969:Molecular Sequence Data; D010766:Phosphorylation; D011401:Promoter Regions, Genetic / Q000235:genetics; D011494:Protein Kinases / Q000378:metabolism; D011499:Protein Processing, Post-Translational / Q000502:physiology; D017422:Sequence Analysis, DNA; D014158:Transcription, Genetic / Q000235:genetics
chemical_list: D004247:DNA; D011494:Protein Kinases; D004250:DNA Topoisomerases, Type II