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- W2033386104 abstract "DNA topoisomerase (topo) II modulates DNA topology and is essential for cell division. There are two isoforms of topo II (α and β) that have limited functional redundancy, although their catalytic mechanisms appear the same. Using their COOH-terminal domains (CTDs) in yeast two-hybrid analysis, we have identified phospholipid scramblase 1 (PLSCR1) as a binding partner of both topo II α and β. Although predominantly a plasma membrane protein involved in phosphatidylserine externalization, PLSCR1 can also be imported into the nucleus where it may have a tumour suppressor function. The interactions of PLSCR1 and topo II were confirmed by pull-down assays with topo II α and β CTD fusion proteins and endogenous PLSCR1, and by co-immunoprecipitation of endogenous PLSCR1 and topo II α and β from HeLa cell nuclear extracts. PLSCR1 also increased the decatenation activity of human topo IIα. A conserved basic sequence in the CTD of topo IIα was identified as being essential for binding to PLSCR1 and binding of the two proteins could be inhibited by a synthetic peptide corresponding to topo IIα amino acids 1430-1441. These studies reveal for the first time a physical and functional interaction between topo II and PLSCR1." @default.
- W2033386104 created "2016-06-24" @default.
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- W2033386104 date "2007-06-06" @default.
- W2033386104 modified "2023-10-17" @default.
- W2033386104 title "Nuclear interactions of topoisomerase II and with phospholipid scramblase 1" @default.
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- W2033386104 doi "https://doi.org/10.1093/nar/gkm434" @default.
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