Gene

Catalysis

Cell biology

Target protein

Biology

Electrophile

Proteolysis

Ubiquitin ligase

Receptor

Signal transducing adaptor protein

Biochemistry

DNA ligase

Ubiquitin

Ligand (biochemistry)

Enzyme

Chemistry

Proteasome

Deubiquitinating enzyme

Protein degradation

Journal of the American Chemical Society

Ligand-induced protein degradation has emerged as a compelling approach to promote the targeted elimination of proteins from cells by directing these proteins to the ubiquitin-proteasome machinery. So far, only a limited number of E3 ligases have been found to support ligand-induced protein degradation, reflecting a dearth of E3-binding compounds for proteolysis-targeting chimera (PROTAC) design. Here, we describe a functional screening strategy performed with a focused library of candidate electrophilic PROTACs to discover bifunctional compounds that degrade proteins in human cells by covalently engaging E3 ligases. Mechanistic studies revealed that the electrophilic PROTACs act through modifying specific cysteines in DCAF11, a poorly characterized E3 ligase substrate adaptor. We further show that DCAF11-directed electrophilic PROTACs can degrade multiple endogenous proteins, including FBKP12 and the androgen receptor, in human prostate cancer cells. Our findings designate DCAF11 as an E3 ligase capable of supporting ligand-induced protein degradation via electrophilic PROTACs.

DCAF11 Supports Targeted Protein Degradation by Electrophilic Proteolysis-Targeting Chimeras