Abstract
Two imidazole groups act together to catalyze the hydrolysis of the phosphodiester bis(2-(1-methyl-1H-imidazolyl)phenyl) phosphate (BMIPP). A full investigation involving searching computational and electrospray ionization (ESI-MS-/MS) and ultra mass spectrometry (LTQ-FT) experiments made possible a choice between two kinetically equivalent mechanisms. The preferred pathway, involving intramolecular nucleophilic catalysis by imidazole, assisted by intramolecular general acid catalysis by the imidazolium group, offers the first simple model for the mechanism used by the extensive phospholipase D superfamily.
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