1421705-35-2Relevant academic research and scientific papers
Reversible and efficient inhibition of UDP-galactopyranose mutase by electrophilic, constrained and unsaturated UDP-galactitol analogues
Ansiaux, Christophe,N'Go, Inès,Vincent, Stéphane P.
, p. 14860 - 14866 (2012)
A series of UDP-galactitols were designed as analogues of high-energy intermediates of the UDP-galactopyranose mutase (UGM) catalyzed furanose/pyranose interconversion, an essential step of Mycobacterium tuberculosis cell wall biosynthesis. The final compounds structurally share the UDP and the galactitol substructures that were connected by four distinct electrophilic connections (epoxide, lactone and Michael acceptors). All molecules were synthesized from a common perbenzylated acyclic galactose precursor that was derivatized by alkenylation, alkynylation and cyclopropanation. The inhibition study against UGM could clearly show that slight changes in the relative orientation of the UDP and the galactitol moieties resulted in dramatic variations of binding properties. Compared to known inhibitors, the epoxide derivative displayed a very tight, reversible, inhibition profile. Moreover, a time-dependent inactivation study showed that none of these electrophilic structures could react with UGM, or its FAD cofactor, the catalytic nucleophile of this still intriguing reaction. Shedding inhibitors: UDP-Galactopyranose mutase (UGM) is a validated target for treating tuberculosis. Its mechanism involves formation of a key covalent FAD-substrate intermediate, 1. A series of electrophilic UDP-galactitols were synthesized and assayed as inhibitors or inactivators of UGM. Strong inhibitions were observed, especially with epoxide 2. Interestingly, none of the molecules displayed an irreversible inhibition mode. Copyright
