Crystal Structure of Catechol <i>O</i>-Methyltransferase Complexed with Nitecapone

Catechol O-methyltransferase (COMT) is known as an important drug-target protein in the field of Parkinson’s disease. All clinically approved COMT inhibitors bring a 5-substituted-3-nitrocatechol ring as a pharmacophore, and they bind to COMT with S-adenosylmethionine (SAM) and an Mg2+ ion to form a quaternary complex (COMT/SAM/Mg2+/inhibitor). However, structural information about such quaternary complexes is only available for a few...