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Reversible Spatiotemporal Control of Induced Protein Degradation by Bistable PhotoPROTACs

Open access
Pfaff, Patrick, Samarasinghe, Kusal T. G., Crews, Craig M., Carreira, Erick M.·2019·ACS Central Science

Abstract

Off-target effects are persistent issues of modern inhibition-based therapies. By merging the strategies of photopharmacology and small molecule degraders, we introduce a novel concept for persistent spatiotemporal control of induced protein degradation that potentially prevents off-target toxicity. Building on the successful principle of bifunctional all-small molecule Proteolysis Targeting Chimeras (PROTACs), we designed photoswitchable PROTACs ( photoPROTACs ) by including ortho- F 4 -azobenzene linkers between both warhead ligands. This highly bistable yet photoswitchable structural component leads to reversible control over the topological distance between both ligands. The azo - cis -isomer is observed to be inactive because the distance defined by the linker is prohibitively short to permit complex formation between the protein binding partners. By contrast, the azo - trans -isomer is active because it can engage both protein partners to form the necessary and productive ternary complex. Importantly, due to the bistable nature of the ortho -F 4 -azobenzene moiety employed, the photostationary state of the photoPROTAC is persistent, with no need for continuous irradiation. This technique offers reversible on/off switching of protein degradation that is compatible with an intracellular environment and, therefore, could be vastly useful in experimental probing of biological signaling pathways – especially those crucial for oncogenic signal transduction. Additionally, this strategy may be suitable for therapeutic implementation in a wide variety of disease phenotypes. By enabling reversible activation and deactivation of protein degradation, photoPROTACs offer advantages over conventional photocaging strategies that irreversibly release active agents.

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Metadata

Authors
Pfaff, P., Samarasinghe, K. T. G., Crews, C. M., & Carreira, E. M.
Venue
ACS Central Science
Published
2019-09-17
Volume
5
Issue
10
Pages
1682-1690
ISSN
  • 2374-7943 (ISSN-L)
  • 2374-7951
OpenAlex
W2974217727
Cited by
301
References
9
FWCI
9.38
Type
journal article
Language
en
Open access
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CoChat. (2026). Citation check: Reversible Spatiotemporal Control of Induced Protein Degradation by Bistable PhotoPROTACs. https://app.cochat.ai/papers/10.1021/acscentsci.9b00713
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Pfaff, P., Samarasinghe, K. T. G., Crews, C. M., & Carreira, E. M. (2019). Reversible Spatiotemporal Control of Induced Protein Degradation by Bistable PhotoPROTACs. ACS Central Science. https://doi.org/10.1021/acscentsci.9b00713

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