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Understanding the selectivity of methyltransferase inhibitors is important to dissecting the functions of each methyltransferase target. From this perspective, we report a chemoproteomic study to profile the selectivity of a potent protein N-terminal methyltransferase 1 (NTMT1) bisubstrate inhibitor NAH-C3-GPKK (Ki, app = 7 ± 1 nM) in endogenous proteomes. First, we describe the rational design, synthesis, and biochemical characterization of a new chemical probe 6, a biotinylated analogue of NAH-C3-GPKK. Next, we systematically analyze