Journal
MOLECULAR AND CELLULAR BIOLOGY
Volume 27, Issue 8, Pages 3211-3216Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/MCB.00091-07
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Funding
- NCI NIH HHS [R37 CA035035, CA41261, CA35035, R01 CA041261, R37 CA041261, R01 CA035035] Funding Source: Medline
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Treatment of yeast and human cells with DNA-damaging agents elicits lysine 48-linked polyubiquitylation of Rpb1, the largest subunit of RNA polymerase 11 (Pol 11), which targets Pol 11 for proteasomal degradation. However, the ubiquitin ligase (E3) responsible for Pol 11 polyubiquitylation has not been identified in humans or the yeast Saccharomyces cerevisiae. Here we show that elongin A (Ela1) and cullin 3 (Cul3) are required for Pol 11 polyubiquitylation and degradation in yeast cells, and on the basis of these and other observations, we propose that an E3 comprised of elongin C (Elc1), Ela1, Cul3, and the RING finger protein Roc1 (Rbx1) mediates this process in yeast cells. This study provides, in addition to the identification of the E3 required for Pol 11 polyubiquitylation and degradation in yeast cells, the first evidence for a specific function in yeast for a member of the elongin C/BC-box protein/cullin family of ligases. Also, these observations raise the distinct possibility that the elongin C-containing ubiquitin ligase, the von Hippel-Lindau tumor suppressor complex, promotes Poll 11 polyubiquitylation and degradation in human cells.
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