Requirement of ELC1 for RNA polymerase II polyubiquitylation and degradation in response to DNA damage in Saccharomyces cerevisiae.
Treatment of Saccharomyces cerevisiae and human cells with DNA-damaging agents such as UV light or 4-nitroquinoline-1-oxide induces polyubiquitylation of the largest RNA polymerase II (Pol II) subunit, Rpb1, which results in rapid Pol II degradation by the proteasome. Here we identify a novel role for the yeast Elc1 protein in mediating Pol II polyubiquitylation and degradation in DNA-damaged yeast cells and propose the involvement of a ubiquitin ligase, of which Elc1 is a component, in this process. In addition, we present genetic evidence for a possible involvement of Elc1 in Rad7-Rad16-dependent nucleotide excision repair (NER) of lesions from the nontranscribed regions of the genome and suggest a role for Elc1 in increasing the proficiency of repair of nontranscribed DNA, where as a component of the Rad7-Rad16-Elc1 ubiquitin ligase, it would promote the efficient turnover of the NER ensemble from the lesion site in a Rad23-19S proteasomal complex-dependent reaction.
Ribar
Balazs
B
Sealy Center for Molecular Science, University of Texas Medical Branch at Galveston, Galveston, TX 77555-1061, USA.
Prakash
Louise
L
Prakash
Satya
S
D004249:DNA Damage; D004260:DNA Repair / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics; D000075065:Elongin; D004843:Epistasis, Genetic; D005800:Genes, Fungal; D008239:Lysine / Q000378:metabolism; D009154:Mutation / Q000235:genetics; D025821:Polyubiquitin / Q000378:metabolism*; D011499:Protein Processing, Post-Translational; D012319:RNA Polymerase II / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000166:cytology / Q000201:enzymology* / Q000528:radiation effects; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics* / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism*; D014466:Ultraviolet Rays
D004268:DNA-Binding Proteins; D000075065:Elongin; C490846:RAD23 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; D025821:Polyubiquitin; D012319:RNA Polymerase II; D008239:Lysine