Direct targeting of intrinsically disordered proteins, including MYC, by small molecules for biomedical applications would resolve al ongstanding issue in chemical biology and medicine. Thus, we developed gold-based small-molecule MYC reagents that engageM YC inside cells and modulate MYC transcriptional activity.L ead compounds comprise an affinity ligand and ag old(I)o rgold(III) warhead capable of protein chemical modification.C ell-based MYC target engagement studies via CETSA and co-immunoprecipitation reveal specific interaction of compounds with MYC in cells. The lead gold(I) reagent, 1,d emonstrates superior cell-killing potential(up to 35-fold) in aM YC-dependent manner when compared to 10058-F4i nc ellsi ncludingt he TNBC, MDA-MB-231. Subsequently, 1 suppresses MYC transcription factor activity via functional colorimetric assays,a nd gene-profiling using whole-cellt ranscriptomics reveals significant modulation of MYC target genes by 1.T hese findings point to metal-mediated ligand affinity chemistry (MLAC) based on gold as ap romising strategyt od evelop chemical probes and anticancer therapeutics targeting MYC.