Synthesis and evaluation of substrate analogues as mechanism-based inhibitors of type II isopentenyl diphosphate isomerase |
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Authors: | Walker Joel R Rothman Steven C Poulter C Dale |
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Institution: | Department of Chemistry, University of Utah, 315 South 1400 East RM 2020, Salt Lake City, Utah 84112, USA. |
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Abstract: | Type 2 isopentenyl diphosphate isomerase (IDI-2), which catalyzes the interconversion of isopentenyl diphosphate and dimethylallyl diphosphate, contains a tightly bound molecule of FMN. To probe the mechanism of the reaction, cyclopropyl and epoxy substrate analogues, designed to be mechanism-based irreversible inhibitors, were synthesized and evaluated with IDI-2 from Thermus thermophilus. The cyclopropyl analogues were alternative substrates. The epoxy analogue was an irreversible inhibitor, with kI = 0.37 +/- 0.07 min(-1) and KI = 1.4 +/- 0.3 microM. LC-MS studies revealed formation of an epoxide-FMN adduct. |
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