Modulating PCAF/GCN5 Immune Cell Function through a PROTAC Approach
Abstract
P300/CBP-associated factor (PCAF) and general control nonderepressible 5 (GCN5) are closely related epigenetic proteins, each containing an acetyltransferase domain and a bromodomain. Consistent with reported roles for these proteins in immune function, we find that PCAF-deficient macrophages exhibit a markedly reduced ability to produce cytokines upon stimulation with lipopolysaccharide (LPS). Investigating the potential to target this pathway pharmacologically, we show that chemical inhibition of the PCAF/GCN5 bromodomains is insufficient to recapitulate the diminished inflammatory response of PCAF-deficient immune cells. However, by generating the first PCAF/GCN5 proteolysis targeting chimera (PROTAC), we identify small molecules able to degrade PCAF/GCN5 and to potently modulate the expression of multiple inflammatory mediators in LPS-stimulated macrophages and dendritic cells. Our data illustrate the power of the PROTAC approach in the context of multidomain proteins, revealing a novel anti-inflammatory therapeutic opportunity for targeting PCAF/GCN5.
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GSK983 efficiently degrades PCAF and GCN5 in THP1 acute monocytic leukemia cells.
“A PCAF/GCN5 PROTAC, named GSK983, efficiently degraded PCAF and GCN5 in THP1 acute monocytic leukemia cells [179].”
From Proteolysis targeting chimeras (PROTACs) are emerging therapeutics for hematologic malignancies (2020) · cites this paper as [179]
Protein domains that feature ligandable binding pockets but are not involved in the pathogenic function of a gene can be favourably targeted by PROTACs.
“Protein domains that feature ligandable binding pockets but are not involved in the pathogenic function of a gene can be favourably targeted by these molecules 26,27 ,”
From Targeted protein degradation: expanding the toolbox (2019) · cites this paper as [26]
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- Authors
- Bassi, Z. I., Fillmore, M. C., Miah, A. H., Chapman, T. D., Maller, C., Roberts, E. J., Davis, L. C., Lewis, D. E., Galwey, N. W., Waddington, K. E., Parravicini, V., Macmillan-Jones, A. L., Gongora, C., Humphreys, P. G., Churcher, I., Prinjha, R. K., & Tough, D. F.
- Affiliations
- GlaxoSmithKline (United Kingdom) (GB)
- Inserm (FR)
- Institut de Recherche en Cancérologie de Montpellier, INSERM U1194, Université de Montpellier, Montpellier F-34298, France
- Corresponding author
- Tough, David F.
- ORCID
- Venue
- ACS Chemical Biology
- Publisher
- American Chemical Society (ACS)
- Published
- 2018-09-10
- Volume
- 13
- Issue
- 10
- Pages
- 2862-2867
- ISSN
- 1554-8929 (ISSN-L)
- 1554-8937
- OpenAlex
- W2891213440
- Cited by
- 186
- References
- 22
- Citations by year
- 2026: 22 · 2025: 15 · 2024: 25 · 2023: 31 · 2022: 13 · 2021: 27 · 2020: 29 · 2019: 21 · 2018: 2 · 2014: 1
- FWCI
- 7.38
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- ACS Chemical Biology (publishedVersion)
- PubMed (publishedVersion)
- HAL (submittedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Degradation and Inhibitors
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Histone Deacetylase Inhibitors Research
- Keywords
- PCAF, GCN5, PROTACs, bromodomain, protein degradation, macrophages, dendritic cells, lipopolysaccharide, inflammatory cytokines, anti-inflammatory therapy, multidomain proteins
- MeSH terms
- Protein Domains, p300-CBP-Associated Factor, Animals, Benzoates, Cell Differentiation, Dendritic Cells, Humans, Inflammation, Lipopolysaccharides, Macrophages, Monocytes, Peptide Hydrolases, Piperidines, Pyridazines, Stereoisomerism, Cytokines, Ubiquitin-Protein Ligases, Adaptor Proteins, Signal Transducing, p300-CBP Transcription Factors, Mice, Proteolysis
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