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Wolf-Hirschhorn Syndrome Candidate 1 (WHSC1; also known as NSD2) is a SET domain-containing histone lysine methyltransferase. A chromosomal translocation occurs in 15-20% of multiple myeloma patients and is associated with increased production of WHSC1 and poor clinical prognosis. To define the substrate requirements of NSD2, we established a platform for the large-scale production of recombinant polynucleosomes, based on authentic human histone proteins, expressed in E. coli, and complexed with linearized DNA. A brief survey of methyltransferases whose substrate requirements are recorded in the literature yielded expected results, lending credence to the fitness of our approach. This platform was readily 'codified' with respect to both position and extent of methylation at histone 3 lysines 18 and 36 and led to the conclusion that the most readily discernible activity of NSD2 in contact with a nucleosome substrate is dimethylation of histone 3 lysine 36. We further explored reaction mechanism, and conclude a processive, rather than distributive mechanism best describes the interaction of NSD2 with intact nucleosome substrates. The methods developed feature scale and flexibility and are suited to thorough pharmaceutical-scale drug discovery campaigns.
Exit from mitosis is characterized by a precipitous decline in cyclin-dependent kinase (Cdk) activity, dissolution of mitotic structures, and cytokinesis. In Saccharomyces cerevisiae, mitotic exit is driven by a protein phosphatase, Cdc14, which is in part responsible for counteracting Cdk activity. Throughout interphase, Cdc14 is sequestered in the nucleolus, but successful anaphase activates the mitotic exit network (MEN), which triggers dispersal of Cdc14 throughout the cell by a mechanism that has remained unknown. In this study, we show that a MEN component, protein kinase Dbf2-Mob1, promotes transfer of Cdc14 to the cytoplasm and consequent exit from mitosis by direct phosphorylation of Cdc14 on serine and threonine residues adjacent to a nuclear localization signal (NLS), thereby abrogating its NLS activity. Our results define a mechanism by which the MEN promotes exit from mitosis.
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