The phosphorylated carboxyl-terminal domain (CTD) of RNA polymerase II, consisting of ((1)YSPTSPS(7))(n) heptad repeats, encodes information about the state of the transcriptional apparatus that can be conveyed to factors that regulate mRNA synthesis and processing. Here we describe how the CTD code is read by two classes of protein phosphatases, plant CPLs and yeast Ssu72, that specifically dephosphorylate Ser(5) in vitro. The CPLs and Ssu72 recognize entirely different positional cues in the CTD primary structure. Whereas the CPLs rely on Tyr(1) and Pro(3) located on the upstream side of the Ser(5)-PO(4) target site, Ssu72 recognizes Thr(4) and Pro(6) flanking the target Ser(5)-PO(4) plus the downstream Tyr(1) residue of the adjacent heptad. We surmise that the reading of the CTD code does not obey uniform rules with respect to the location and phasing of specificity determinants. Thus, CTD code, like the CTD structure, is plastic.
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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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