Abstract
The d,d-transpeptidase activity of Penicillin Binding Proteins (PBPs) is essential to maintain cell wall integrity. PBPs catalyze the final step of the peptidoglycan synthesis by forming 4 → 3 cross-links between two peptide stems. Recently, a novel β-lactam resistance mechanism involving l,d-transpeptidases has been identified in Enterococcus faecium and Mycobacterium tuberculosis. In this resistance pathway, the classical 4 → 3 cross-links are replaced by 3 → 3 cross-links, whose formation are catalyzed by the l,d-transpeptidases. To date, only one class of the entire β-lactam family, the carbapenems, is able to inhibit the l,d-transpeptidase activity. Nevertheless, the specificity of this inactivation is still not understood. Hence, the study of this new transpeptidase family is of considerable interest in order to understand the mechanism of the l,d-transpeptidases inhibition by carbapenems. In this context, we present herein the backbone and side-chain 1H, 15N and 13C NMR assignment of the l,d-transpeptidase from Bacillus subtilis (LdtBs) in the apo and in the acylated form with a carbapenem, the imipenem.
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Acknowledgments
Financial support by the Access to Research Infrastructures activity in the 6th Framework Programme of the EC (Contract # RII3-026145, EU-NMR) for conducting the research on the 900 MHz spectrometer of the CERM Facility and by the French TGIR-RMN for conducting the research on the 800 MHz spectrometer of the IBS Facility are gratefully acknowledged.
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Lecoq, L., Bougault, C., Kern, T. et al. Backbone and side-chain 1H, 15N and 13C assignment of apo- and imipenem-acylated l,d-transpeptidase from Bacillus subtilis . Biomol NMR Assign 6, 205–208 (2012). https://doi.org/10.1007/s12104-012-9358-1
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DOI: https://doi.org/10.1007/s12104-012-9358-1