title: Transcriptional activating regions target attached substrates to a cyclin-dependent kinase.
abstract: The yeast cyclin-dependent kinase Srb10 phosphorylates various transcriptional activators as they activate transcription, and acidic transcriptional activating domains found on several activators directly bind Srb10. Here we show that the interaction between Srb10 (with its associated cyclin Srb11) and each of several different activating regions, in vitro, leads to the phosphorylation of peptide sequences attached to but outside of the activating regions themselves. In some cases, residues within the activating regions are also phosphorylated. The results define a mechanism by which a kinase is recruited to alternate substrates with diverse physiological consequences.
authors.affiliation: Department of Biochemistry and Genome Center, University of Wisconsin, Madison, WI 53706, USA.
authors.forename: Aseem Z
authors.initials: AZ
authors.lastname: Ansari
authors.forename: Anuja
authors.initials: A
authors.lastname: Ogirala
authors.forename: Mark
authors.initials: M
authors.lastname: Ptashne
mesh_terms: D000595:Amino Acid Sequence; D001665:Binding Sites / Q000235:genetics; D056850:Cyclin-Dependent Kinase 8; D018844:Cyclin-Dependent Kinases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D016213:Cyclins; D008969:Molecular Sequence Data; D016296:Mutagenesis; D010766:Phosphorylation; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D013379:Substrate Specificity; D015534:Trans-Activators / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D014157:Transcription Factors
chemical_list: D016213:Cyclins; D011993:Recombinant Fusion Proteins; D029701:Saccharomyces cerevisiae Proteins; D015534:Trans-Activators; D014157:Transcription Factors; C093345:SSN8 protein, S cerevisiae; D056850:Cyclin-Dependent Kinase 8; D018844:Cyclin-Dependent Kinases; C498309:SSN3 protein, S cerevisiae