3.4.22.47 | sitting-drop vapor diffusion method, high-resolution (1.20 A) complex structure of the enzyme with KYT-36. Sub-nanomolar inhibition of Kgp is achieved by tight binding to the active-site cleft, which is covered for its sub-sites S3 through S1' under establishment of nine hydrophobic interactions, 14 hydrogen bonds and one salt bridge. In addition, an inhibitor carbonyl carbon that mimics the scissile carbonyl of substrates is pyramidalized and just 2.02 A away from the catalytic nucleophile of Kgp, C477Sgamma |