KG-501 is primarily used in biochemical and molecular biology research as a selective inhibitor of the CREB-binding protein (CBP)/p300 interaction with transcription factors. It plays a key role in studies related to gene expression regulation, particularly in disrupting the binding of CBP to cAMP response element-binding protein (CREB), which is involved in cellular processes such as differentiation, proliferation, and metabolism. Researchers utilize KG-501 to probe signaling pathways linked to inflammation, cancer, and circadian rhythm control. Its ability to interfere with transcriptional coactivation makes it a valuable tool in understanding epigenetic regulation and developing potential therapeutic strategies targeting protein-protein interactions in transcriptional machinery.