Thiol-Containing Metallo-β-Lactamase Inhibitors Resensitize Resistant Gram-Negative Bacteria to Meropenem
摘要:
The prevalence of infections caused by metallo-beta-lactamase (MBL) expressing Gram-negative bacteria has grown at an alarming rate in recent years. Despite the fact that MBLs can deactivate virtually all beta-lactam antibiotics, there are as of yet no approved drugs available that inhibit their activity. We here examine the ability of previously reported thiol-based MBL inhibitors to synergize with meropenem and cefoperazone against a panel of Gram-negative carbapenem-resistant isolates expressing different beta-lactamases. Among the compounds tested, thiomandelic acid 3 and 2-mercapto-3-phenylpropionic acid 4 were found to efficiently potentiate the activity of meropenem, especially against an imipenemase (IMP) producing strain of K. pneumoniae. In light of the zinc-dependent hydrolytic mechanism employed by MBLs, biophysical studies using isothermal titration calorimetry were also performed, revealing a correlation between the synergistic activity of thiols 3 and 4 and their zinc-binding ability with measured K-d values of 9.8 and 20.0 mu M, respectively.
Thiol-Containing Metallo-β-Lactamase Inhibitors Resensitize Resistant Gram-Negative Bacteria to Meropenem
作者:Kamaleddin Haj Mohammad Ebrahim Tehrani、Nathaniel I. Martin
DOI:10.1021/acsinfecdis.7b00094
日期:2017.10.13
The prevalence of infections caused by metallo-beta-lactamase (MBL) expressing Gram-negative bacteria has grown at an alarming rate in recent years. Despite the fact that MBLs can deactivate virtually all beta-lactam antibiotics, there are as of yet no approved drugs available that inhibit their activity. We here examine the ability of previously reported thiol-based MBL inhibitors to synergize with meropenem and cefoperazone against a panel of Gram-negative carbapenem-resistant isolates expressing different beta-lactamases. Among the compounds tested, thiomandelic acid 3 and 2-mercapto-3-phenylpropionic acid 4 were found to efficiently potentiate the activity of meropenem, especially against an imipenemase (IMP) producing strain of K. pneumoniae. In light of the zinc-dependent hydrolytic mechanism employed by MBLs, biophysical studies using isothermal titration calorimetry were also performed, revealing a correlation between the synergistic activity of thiols 3 and 4 and their zinc-binding ability with measured K-d values of 9.8 and 20.0 mu M, respectively.
Evidence for α-lactone formation in the thioacetylation of some α-hydroxy acids with the aid of <i>Mitsunobu</i>
-type reagent
作者:Bert Strijtveen、Richard M. Kellogg
DOI:10.1002/recl.19871061006
日期:——
(S-Mandelic acid, (S)-lactic acid, and (S)-2-hydroxy-3-phenylpropionic acid react with thioacetic acid in the presence of the salt of diisopropyl azodicarboxylate and triphenylphosphine to give the α-(acetylthio)-substituted products. (S)-Mandelic acid reacts with predominant retention of configuration whereas (S)-lactic acid and (S)-2-hydroxy-3-phenylpropionic acid react predominantly with inversion