Abstract
Emergence of antimicrobial resistance mediated through New Delhi metallo-β-lactamases (NDMs) is a serious therapeutic challenge. Till date, 16 different NDMs have been described. In this study, we report the molecular and structural characteristics of NDM-5 isolated from an Escherichia coli isolate (KOEC3) of bovine origin. Using PCR amplification, cloning and sequencing of full blaNDM gene, we identified the NDM type as NDM-5. Cloning of full gene in E. coli DH5α and subsequent assessment of antibiotic susceptibility of the transformed cells indicated possible role of native promoter in expression blaNDM-5. Translated amino acid sequence had two substitutions (Val88Leu and Met154Leu) compared to NDM-1. Theoretically deduced isoelectric pH of NDM-5 was 5.88 and instability index was 36.99, indicating a stable protein. From the amino acids sequence, a 3D model of the protein was computed. Analysis of the protein structure elucidated zinc coordination and also revealed a large binding cleft and flexible nature of the protein, which might be the reason for broad substrate range. Docking experiments revealed plausible binding poses for five carbapenem drugs in the vicinity of metal ions. In conclusion, results provided possible explanation for wide range of antibiotics catalyzed by NDM-5 and likely interaction modes with five carbapenem drugs.
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Acknowledgments
The authors are thankful to Director, ICAR RC for NEH Region, Meghalaya for providing necessary facilities and to Department of Biotechnology, New Delhi for partly funding the study under Twinning programme for NE (Sanction Order No. BT/363/NE/TBFJIL/12 dated March 21, 2013). Authors are thankful to Dr Manish Kakkar for his critical inputs into the manuscript.
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D. Purkait, A. Ahuja and U. Bhattacharjee have contributed equally for this study.
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12088_2016_569_MOESM1_ESM.png
PCR detection of blaNDM-5 gene in Escherichia coli isolates (KOEC3 and transformed DH5α cells). Lane M: Molecular weight marker; Lane A: KOEC3 (positive control); Lane B: Transformed DH5α (blaNDM-5 forward and reverse primers); Lane C: Transformed DH5α (blaNDM-5 forward and T7 promoter primers); Lane D: Negative control. (PNG 342 kb)
12088_2016_569_MOESM2_ESM.png
Quality assessment of computed three dimensional model of NDM-5. (a) Comparison of NDM-5 computed model with non-redundant set of PDB structures. (b) Density plot of the QMEAN score of reference PDB set with NDM-5 (in red). (c) Per residue error plot NDM-5. Blue: errors < 1 Å, red: errors above 3.5 Å. (PNG 360 kb)
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Purkait, D., Ahuja, A., Bhattacharjee, U. et al. Molecular Characterization and Computational Modelling of New Delhi Metallo-β-Lactamase-5 from an Escherichia coli Isolate (KOEC3) of Bovine Origin. Indian J Microbiol 56, 182–189 (2016). https://doi.org/10.1007/s12088-016-0569-5
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DOI: https://doi.org/10.1007/s12088-016-0569-5