生物活性 | |||
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描述 | Phthiocerol dimycocerosates and phenolic glycolipids (PGL) are considered as major virulence elements of Mycobacterium tuberculosis, in particular because of their involvement in cell wall impermeability and drug resistance. The biosynthesis of these waxy lipids involves multiple enzymes, including thioesterase A (TesA). Methyl arachidonyl fluorophosphonate (MAFP) inhibits Mycobacterium tuberculosis thioesterase TesA and globally affects vancomycin susceptibility. MAFP increased by more than 10-fold the susceptibility of M. bovis BCG to vancomycin. The MIC of MAFP dropped from ≥ 10 to 1 μg/mL in the presence of vancomycin (25 μg/mL), and the MIC of vancomycin dropped from ≥ 500 to25 μg/mL in the presence of MAFP (1 μg/mL), showing that this combination can inhibit M. bovis BCG growth in synergy (FICI < 0.15). MAFP inhibited TesA TE activity in a concentration-dependent manner. With MAFP, a maximal 52% inhibition was observed in all tested experimental conditions, for example the competitive assay or by preincubating TesA with MAFP for 5 or 20 min before starting the reaction with palmitoyl-CoA[1]. | ||
作用机制 | MAFP docks into one of the two binding sites of the dimer. Most of the MAFP poses occupy the second binding site with the fluorophosphonate matching the crystal ligand phosphate[1]. |
实验方案 | |||
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1mg | 5mg | 10mg | |
1 mM 5 mM 10 mM |
2.70mL 0.54mL 0.27mL |
13.50mL 2.70mL 1.35mL |
26.99mL 5.40mL 2.70mL |
参考文献 |
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