A kinase activity specific for the C-terminal repeat domain (CTD) of RNA polymerase II is associated with nearly homogeneous yeast general initiation factor b by three criteria: cofractionation on the basis of size and charge and coinactivation by mild heat treatment. The kinase phosphorylates the CTD at multiple sites in a processive manner. Factor b may possess a DNA-dependent ATPase activity as well. Both kinase and DNA-dependent ATPase activities exhibit the same nucleotide requirements as previously demonstrated for the initiation of transcription. These results support the idea that phosphorylation of the CTD lies on the pathway of transcription initiation and identify a catalytic activity of a general factor essential for the initiation process.
|Evidence ID||Analyze ID||Interactor||Interactor Systematic Name||Interactor||Interactor Systematic Name||Type||Assay||Annotation||Action||Modification||Phenotype||Source||Reference||Note|
|Evidence ID||Analyze ID||Gene||Gene Systematic Name||Gene Ontology Term||Gene Ontology Term ID||Qualifier||Aspect||Method||Evidence||Source||Assigned On||Reference||Annotation Extension|
|Evidence ID||Analyze ID||Gene||Gene Systematic Name||Phenotype||Experiment Type||Experiment Type Category||Mutant Information||Strain Background||Chemical||Details||Reference|
|Evidence ID||Analyze ID||Regulator||Regulator Systematic Name||Target||Target Systematic Name||Experiment||Conditions||Strain||Source||Reference|