The largest subunit of RNA polymerase II contains a unique C-terminal domain important for coupling of transcription and mRNA processing. This domain consists of a repeated heptameric sequence (YSPTSPS) phosphorylated at serines 2 and 5. Serine 5 is phosphorylated during initiation and recruits capping enzyme. Serine 2 is phosphorylated during elongation by the Ctk1 kinase, a protein similar to mammalian Cdk9/P-TEFb. Chromatin immunoprecipitation was used to map positions of transcription elongation and mRNA processing factors in strains lacking Ctk1. Ctk1 is not required for association of elongation factors with transcribing polymerase. However, in ctk1Delta strains, the recruitment of polyadenylation factors to 3' regions of genes is disrupted and changes in 3' ends are seen. Therefore, Serine 2 phosphorylation by Ctk1 recruits factors for cotranscriptional 3' end processing in vivo.
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| Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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| Site | Modification | Modifier | Source | Reference |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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| Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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| Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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| Evidence ID | Analyze ID | File | Description |
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