Transcriptional arrest triggers ubiquitylation of RNA polymerase II (RNAPII). We mapped the yeast RNAPII ubiquitylation sites and found that they play an important role in elongation and the DNA-damage response. One site lies in a protein domain that is unordered in free RNAPII, but ordered in the elongating form, helping explain the preferential ubiquitylation of this form. The other site is >125 Angstroms away, yet mutation of either site affects ubiquitylation of the other, in vitro and in vivo. The basis for this remarkable coupling was uncovered: an Rsp5 (E3) dimer assembled on the RNAPII C-terminal domain (CTD). The ubiquitylation sites bind Ubc5 (E2), which in turn binds Rsp5 to allow modification. Evidence for folding of the CTD compatible with this mechanism of communication between distant sites is provided. These data reveal the specificity and mechanism of RNAPII ubiquitylation and demonstrate that E2s can play a crucial role in substrate recognition.
|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|