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E3 Ligase Ligands for PROTACs: How They Were Found and How to Discover New Ones

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Ishida, Tasuku, Ciulli, Alessio·2021·SLAS Discovery

Abstract

Bifunctional degrader molecules, also called proteolysis-targeting chimeras (PROTACs), are a new modality of chemical tools and potential therapeutics to understand and treat human disease. A required PROTAC component is a ligand binding to an E3 ubiquitin ligase, which is then joined to another ligand binding to a protein to be degraded via the ubiquitin-proteasome system. The advent of nonpeptidic small-molecule E3 ligase ligands, notably for von Hippel-Lindau (VHL) and cereblon (CRBN), revolutionized the field and ushered in the design of drug-like PROTACs with potent and selective degradation activity. A first wave of PROTAC drugs are now undergoing clinical development in cancer, and the field is seeking to extend the repertoire of chemistries that allow hijacking new E3 ligases to improve the scope of targeted protein degradation.Here, we briefly review how traditional E3 ligase ligands were discovered, and then outline approaches and ligands that have been recently used to discover new E3 ligases for PROTACs. We will then take an outlook at current and future strategies undertaken that invoke either target-based screening or phenotypic-based approaches, including the use of DNA-encoded libraries (DELs), display technologies and cyclic peptides, smaller molecular glue degraders, and covalent warhead ligands. These approaches are ripe for expanding the chemical space of PROTACs and usher in the advent of other emerging bifunctional modalities of proximity-based pharmacology.

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Metadata

Authors
Ishida, T., & Ciulli, A.
Venue
SLAS Discovery
Publisher
Elsevier BV
Published
2021-04
Volume
26
Issue
4
Pages
484-502
ISSN
2472-5552 (ISSN-L)
OpenAlex
W3095840616
Cited by
380
References
172
FWCI
10.86
Type
journal article
Language
en
Open access
hybrid

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CoChat. (2026). Citation check: E3 Ligase Ligands for PROTACs: How They Were Found and How to Discover New Ones. https://app.cochat.ai/papers/10.1177/2472555220965528
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Ishida, T., & Ciulli, A. (2021). E3 Ligase Ligands for PROTACs: How They Were Found and How to Discover New Ones. SLAS Discovery. https://doi.org/10.1177/2472555220965528

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