期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 18, 期 46, 页码 14860-14866出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201202302
关键词
carbohydrates; flavoenzymes; inhibitors; phosphonates; tuberculosis
资金
- Academie Louvain [08/13-012]
- FNRS [2.4.625.08.F]
- University of Namur
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.
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