Download MendeleyDual E3 ligase recruitment by monovalent degraders for tunable SMARCA 2/4 degradation.
Spiteri, V.A., Segal, D., Correa-Saez, A., Iso, K., Casement, R., Munoz I Ordono, M., Nakasone, M.A., Sathe, G., Schatz, C., Peters, H.E., Doward, M., Kainacher, L., Cowan, A.D., Ciulli, A., Winter, G.E.(2026) Nat Chem Biol
- PubMed: 42120501 Search on PubMedSearch on PubMed Central
- DOI: https://doi.org/10.1038/s41589-026-02224-y
- Primary Citation Related Structures:
9S3R - PubMed Abstract:
Proteolysis-targeting chimeras (PROTACs) and molecular glue degraders (MGDs) target proteins for degradation by co-opting an E3 ligase. While heterotrivalent PROTACs that can recruit multiple E3 ligases have been described, all MGDs reported to date depend on a single E3. Using orthogonal genetic screening, biophysical and structural analyses, we show that a monovalent MGD can recruit CUL4 DCAF16 and CRL1 FBXO22 in parallel to degrade SMARCA2/4. Deep mutational scanning identifies C173 in DCAF16 as essential for degrader activity and intact protein mass spectrometry confirms covalent modification at this site. Elucidating the ternary complex structure reveals a unique binding mode and a distinct interface of neointeractions that underlie degrader specificity. We demonstrate that ligase dependency is chemically and genetically tunable. Minimal compound modifications shift preference from DCAF16 to FBXO22, while a single substitution boosts degrader dependency on DCAF16. These results establish a framework for designing tunable dual E3 ligase degraders to mitigate potential resistance mechanisms.
- Centre for Targeted Protein Degradation, School of Life Sciences, University of Dundee, Dundee, UK.
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