Induced ubiquitination of the partially disordered estrogen receptor alpha via a 14-3-3 directed molecular glue-PROTAC
- Carlo J. A. Verhoef
- Charlotte Crowe
- Mark A. Nakasone
- Aitana DeLaCuadra-Basté
- Tessa Harzing
- Naomi A. S. Span
- Gajanan Sathe
- Laura C. Demmers
- Kentaro Iso
- Christian Ottmann
- Luc Brunsveld
- Alessio Ciulli
- Peter J. Cossar
2026-07-15
Proteins lacking defined ligandable pockets remain challenging drug targets. Here, we develop a molecular glue-based PROTAC ( MG PROTAC) approach that chemically conjugates a molecular glue stabilizer to a VHL-recruiting ligand to capture and ubiquitinate the 14-3-3/Estrogen receptor α (ERα) complex. Our designed MG PROTACs engage a composite interface between 14-3-3 and the disordered F-domain of ERα, promoting cooperative complex formation and targeted ubiquitination. Biophysical characterization revealed distinct linker-dependent cooperativities across the MG PROTAC series, which influenced both cellular permeability and ubiquitination efficiency. Cryo-EM of the most cooperative MG PROTAC uncovered de novo VHL–14-3-3ζ contacts, while molecular dynamics simulations rationalize the stabilizing interactions underlying cooperativity. Strikingly, fine-tuning linker design enables selective ubiquitination of distinct complex subunits. These findings establish a structural and mechanistic framework for integrating molecular glue and PROTAC principles, expanding the scope of drug discovery to previously intractable protein complexes.