Abstract:Topoisomerase (topo) II catalyzes topological changes in DNA. Although, both human isozymes, topo IIα and β, are phosphorylated, site-specific phosphorylation of topo IIβ is poorly characterized. Using LC-MS/MS analysis of topo IIβ, cleaved with trypsin, Arg C or cyanogen bromide (CNBr) plus trypsin we detected four +80-Da modified sites, tyrosine 656, serine 1395, threonine 1426 and serine 1545. Phosphorylation at serine 1395, threonine 1426 and serine 1545 was established based on neutral loss of H3PO4 (−98 … Show more
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.