3.5.3.18 | N5-(1-iminopropyl)-L-ornithine:DDAH-1 complex, to 1.9 A resolution, covalent bond formation between the inhibitors amidino carbon and the active-site Cys274, and solution studies show reversible competitive inhibition, consistent with a reversible covalent mode of DDAH inhibition by alkylamidine inhibitors |