PF-CBP1 HCl is primarily used in research settings to study and modulate protein-protein interactions, particularly those involving bromodomains. These interactions play a crucial role in gene expression regulation, making this compound valuable in understanding epigenetic mechanisms. It is often employed in biochemical assays to investigate the function of specific proteins in cellular processes such as transcription, cell cycle regulation, and chromatin remodeling. Additionally, PF-CBP1 HCl serves as a tool compound in drug discovery efforts aimed at developing therapies for diseases linked to dysregulated epigenetic pathways, including cancer and inflammatory disorders. Its application helps identify potential therapeutic targets and evaluate the efficacy of novel inhibitors.