3.4.23.38 recombinant PMI as apoenzyme and in complex with the potent peptidic inhibitor, (4R)-3-[(2S,3S)-3-{[(2,6-dimethylphenoxy)acetyl]amino}-2-hydroxy-4-phenylbutanoyl]-N-[(1S,2R)-2-hydroxy-2,3-dihydro-1H-inden-1-yl]-5,5-dimethyl-1,3-thiazolidine-4-carboxamide, i. e. KNI-10006, at the resolution of 2.4 and 3.1 A, respectively. The apoenzyme crystallizes in the orthorhombic space group P212121 with two molecules in the asymmetric unit. The KNI-10006 bound enzyme crystallized in the tetragonal space group P43 with four molecules in the asymmetric unit a. In the PMI–KNI-10006 complex, the inhibitors are bound identically to all four enzyme molecules, with the opposite directionality of the main chain of KNI-10006 relative to the direction of the enzyme substrates 718040