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The Allosteric Regulator Inositol Phosphate Dramatically Affects the Efficacy and Selectivity of Inhibitors for Different HDAC Complexes

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Pytel, Wiktoria A. ; Patel, Urvashi ; Smalley, Joshua P. ; Millard, Christopher J. ; Brown, Edward A. ; Pavan, Aline R. ; Wang, Siyu ; Kalin, Jay H. ; dos Santos, Jean Leandro ; Cole, Philip A. ; Hodgkinson, James T. ; Schwabe, John W. R.
Número total de Autores: 12
Tipo de documento: Artigo Científico
Fonte: Journal of the American Chemical Society; v. 147, n. 40, p. 9-pg., 2025-09-25.
Resumo

Class I histone deacetylases regulate gene transcription and are established therapeutic targets. HDAC1-3 form the catalytic subunit in several distinct multiprotein complexes; however, HDAC inhibitors are rarely studied in the context of these complexes. We evaluated multiple inhibitors, using seven HDAC complexes, and found that the inhibition profiles were highly complex-dependent, despite targeting the same enzyme. We also investigated the effect of the allosteric regulator inositol phosphate on these inhibitors. We observed very large, complex-selective reductions in the potency of benzamides bearing a "foot-pocket group", proposed to be selective for HDAC1/2. The potencies of these compounds are likely to be profoundly different in vivo compared with in vitro potencies in the absence of inositol phosphates. Our findings are supported by cell-based assays evaluating histone acetylation and HDAC degradation, highlighting the importance of evaluating HDACi in the context of HDAC complexes and inositol phosphates. (AU)

Processo FAPESP: 23/05739-6 - Estratégias para intervenção em complexos repressores do gene de gama-globina contendo Histona Deacetilase (HDAC-1 e HDAC-2)
Beneficiário:Jean Leandro dos Santos
Modalidade de apoio: Auxílio à Pesquisa - Regular
Processo FAPESP: 21/10059-9 - Síntese e avaliação farmacológica de compostos PROTAC baseados em inibidores de HDAC para anemia falciforme
Beneficiário:Aline Renata Pavan
Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado