# PROTACs for Collateral Degradation: Is It Time to Back Up the Bus?

**Authors:** Zhe Gavin Gao, Kevin Burgess

PMC · DOI: 10.1021/acsmedchemlett.5c00645 · 2026-01-12

## TL;DR

This paper explores how off-target effects in certain drug-like molecules called PROTACs might actually be beneficial when targeting complex protein interactions.

## Contribution

The paper introduces the novel idea that collateral degradation by PROTACs could be advantageous in specific biological contexts.

## Key findings

- Off-target effects in PROTACs may be beneficial when targeting multiprotein complexes.
- The functional importance of protein complexes can outweigh the need for single-protein targeting.

## Abstract

Off-target effects are usually undesirable in drug development,
but for some PROTACs and other degraders, they may be advantageous.
Specifically, this can be so when the activities of multiprotein complexes
are more important than just the targeted protein of interest.

## Full-text entities

- **Genes:** PBRM1 (polybromo 1) [NCBI Gene 55193] {aka BAF180, PB1, RCC, SMARCH1}, PRDM9 (PR/SET domain 9) [NCBI Gene 56979] {aka KMT8B, MEISETZ, MSBP3, PFM6, ZNF899}, PRC1 (protein regulator of cytokinesis 1) [NCBI Gene 9055] {aka ASE1, MAP65}, EZH2 (enhancer of zeste 2 polycomb repressive complex 2 subunit) [NCBI Gene 2146] {aka ENX-1, ENX1, EZH2b, KMT6, KMT6A, WVS}, EED (embryonic ectoderm development) [NCBI Gene 8726] {aka COGIS, HEED, WAIT1}, SUZ12 (SUZ12 polycomb repressive complex 2 subunit) [NCBI Gene 23512] {aka CHET9, IMMAS, JJAZ1}, NCOR1 (nuclear receptor corepressor 1) [NCBI Gene 9611] {aka N-CoR, N-CoR1, PPP1R109, TRAC1, hN-CoR}, NFE2L2 (NFE2 like bZIP transcription factor 2) [NCBI Gene 4780] {aka IMDDHH, NRF2, Nrf-2}, SMARCA4 (SWI/SNF related BAF chromatin remodeling complex subunit ATPase 4) [NCBI Gene 6597] {aka BAF190, BAF190A, BRG1, CSS4, MRD16, OTSC12}, CCNL2 (cyclin L2) [NCBI Gene 81669] {aka ANIA-6B, CCNM, CCNS, HCLA-ISO, HLA-ISO, PCEE}, BMI1 (BMI1 proto-oncogene, polycomb ring finger) [NCBI Gene 648] {aka FLVI2/BMI1, PCGF4, RNF51, flvi-2/bmi-1}, SIN3A (SIN3 transcription regulator family member A) [NCBI Gene 25942] {aka CHR15DELq24, DEL15Q24, WITKOS}, CDK2 (cyclin dependent kinase 2) [NCBI Gene 1017] {aka CDKN2, p33(CDK2)}, MAF (MAF bZIP transcription factor) [NCBI Gene 4094] {aka AYGRP, CCA4, CTRCT21, c-MAF}, CDK9 (cyclin dependent kinase 9) [NCBI Gene 1025] {aka C-2k, CDC2L4, CTK1, PITALRE, TAK}, HDAC9 (histone deacetylase 9) [NCBI Gene 9734] {aka HD7, HD7b, HD9, HDAC, HDAC7B, HDAC9B}, RB1 (RB transcriptional corepressor 1) [NCBI Gene 5925] {aka OSRC, PPP1R130, RB, p105-Rb, p110-RB1, pRb}, MAFG (MAF bZIP transcription factor G) [NCBI Gene 4097] {aka hMAF}, RCOR1 (REST corepressor 1) [NCBI Gene 23186] {aka COREST, RCOR}, RNF2 (ring finger protein 2) [NCBI Gene 6045] {aka BAP-1, BAP1, DING, HIPI3, LUSYAM, RING1B}
- **Diseases:** Non-Hodgkin Lymphomas (MESH:D008228), breast cancer (MESH:D001943), Cancer (MESH:D009369), tumorigenic (MESH:D002471)
- **Chemicals:** Lys (MESH:D008239), BTX-9341 (-)
- **Species:** Homo sapiens (human, species) [taxon 9606], Human immunodeficiency virus 1 (no rank) [taxon 11676]
- **Cell lines:** 7TD5 — Mus musculus (Mouse), Hybridoma (CVCL_1935)

## Figures

6 figures with captions in the complete paper: https://tomesphere.com/paper/PMC12907908/full.md

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Source: https://tomesphere.com/paper/PMC12907908