Oral Sessions
(Day1, Day2, Day3, Day4)
Poster Presentations
(Day1, Day2, Day3, Day4)
Luncheon Seminars
(Day1, Day2, Day3, Day4)
Oral Sessions
- Day 4, May 18(Fri.) 10:20-10:40 Room A (OrBit Hall)
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4A-O1-P-1020 PDF
Selective Degradation of Splicing Factor CAPERα by Anticancer Sulfonamides
Target protein degradation is an emerging field in drug discovery and development. In particular, the DCAF-DDB1-CUL4 ubiquitin ligase system plays a key role in selective protein degradation, which is an essential component of the anti-myeloma activity of immunomodulatory drugs (IMiDs) represented by lenalidomide. Here, we demonstrate that the anticancer small molecule sulfonamides E7820, indisulam, and chloroquinoxaline sulfonamide (CQS) induce proteasomal degradation of the U2AF-related splicing factor CAPERα via DCAF15-DDB1-CUL4 mediated ubiquitination. Both CRISPR/Cas9-based knockout of DCAF15 and a single amino acid substitution of CAPERα conferred resistance against sulfonamide-induced CAPERα degradation and cell-growth inhibition. Thus, the sulfonamides represent selective chemical probes for disrupting CAPERα function and designate DCAFs as promising drug targets for promoting selective protein degradation in cancer therapy.