Bisthiazolidines: A Substrate-Mimicking Scaffold as an Inhibitor of the NDM-1 Carbapenemase

Mariano M González, Magda Kosmopoulou, Maria F Mojica, Valerie Castillo, Philip Hinchliffe, Ilaria Pettinati, Jürgen Brem, Christopher J Schofield, Graciela Mahler, Robert A Bonomo, Leticia I Llarrull, Jim Spencer, Alejandro J Vila

Research output: Contribution to journalArticle (Academic Journal)

53 Citations (Scopus)

Abstract

Pathogenic Gram-negative bacteria resistant to almost all β-lactam antibiotics are a major public health threat. Zn(II)-dependent or metallo-β-lactamases (MBLs) produced by these bacteria inactivate most β-lactam antibiotics, including the carbapenems, which are "last line therapies" for life-threatening Gram-negative infections. NDM-1 is a carbapenemase belonging to the MBL family that is rapidly spreading worldwide. Regrettably, inhibitors of MBLs are not yet developed. Here we present the bisthiazolidine (BTZ) scaffold as a structure with some features of β-lactam substrates, which can be modified with metal-binding groups to target the MBL active site. Inspired by known interactions of MBLs with β-lactams, we designed four BTZs that behave as in vitro NDM-1 inhibitors with Ki values in the low micromolar range (from 7 ± 1 to 19 ± 3 μM). NMR spectroscopy demonstrated that they inhibit hydrolysis of imipenem in NDM-1-producing Escherichia coli. In vitro time kill cell-based assays against a variety of bacterial strains harboring blaNDM-1 including Acinetobacter baumannii show that the compounds restore the antibacterial activity of imipenem. A crystal structure of the most potent heterocycle (L-CS319) in complex with NDM-1 at 1.9 Å resolution identified both structural determinants for inhibitor binding and opportunities for further improvements in potency.

Original languageEnglish
Pages (from-to)544-54
Number of pages11
JournalACS Infectious Diseases
Volume1
Issue number11
Early online date7 Jul 2015
DOIs
Publication statusPublished - 13 Nov 2015

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  • Cite this

    González, M. M., Kosmopoulou, M., Mojica, M. F., Castillo, V., Hinchliffe, P., Pettinati, I., Brem, J., Schofield, C. J., Mahler, G., Bonomo, R. A., Llarrull, L. I., Spencer, J., & Vila, A. J. (2015). Bisthiazolidines: A Substrate-Mimicking Scaffold as an Inhibitor of the NDM-1 Carbapenemase. ACS Infectious Diseases, 1(11), 544-54. https://doi.org/10.1021/acsinfecdis.5b00046