Abstract
Introduction
Multivalent antimicrobial dendrimers are an exciting new system that is being developed to address the growing problem of drug resistant bacteria. Nuclear Magnetic Resonance (NMR) metabolomics is a quantitative and reproducible method for the determination of bacterial response to environmental stressors and for visualization of perturbations to biochemical pathways.
Objectives
NMR metabolomics is used to elucidate metabolite differences between wild type and antimicrobially mutated Escherichia coli (E. coli) samples.
Methods
Proton (1H) NMR hydrophilic metabolite analysis was conducted on samples of E. coli after 33 growth cycles of a minimum inhibitory challenge to E. coli by poly(amidoamine) dendrimers functionalized with mannose and with C16-DABCO quaternary ammonium endgroups and compared to the metabolic profile of wild type E. coli.
Results
The wild type and mutated E. coli samples were separated into distinct sample sets by hierarchical clustering, principal component analysis (PCA) and sparse partial least squares discriminate analysis (sPLS-DA). Metabolite components of membrane fortification and energy related pathways had a significant p value and fold change between the wild type and mutated E. coli. Amino acids commonly associated with membrane fortification from cationic antimicrobials, such as lysine, were found to have a higher concentration in the mutated E. coli than in the wild type E. coli. N-acetylglucosamine, a major component of peptidoglycan synthesis, was found to have a 25-fold higher concentration in the mid log phase of the mutated E. coli than in the mid log phase of the wild type.
Conclusion
The metabolic profile suggests that E. coli change their peptidoglycan composition in order to garner protection from the highly positively charged and multivalent C16-DABCO and mannose functionalized dendrimer.
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Acknowledgements
Funding from NIGMS 62,444 is gratefully acknowledged. Dr. Harrison VanKoten provided the bacterial stocks. Dr. Brian Tripet and Dr. Mary Cloud Ammons helped to develop the procedures for metabolite extraction and analysis, and Dr. Brian Tripet helped with acquisition of NMR spectra.
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MLA grew and collected bacterial culture samples, extracted the metabolites, prepared the samples for NMR spectral acquisition, processed the NMR data, performed data analysis and interpretation, and wrote the manuscript. MJC oversaw all aspects of the research project and co-wrote the manuscript.
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Aries, M.L., Cloninger, M.J. NMR metabolomic analysis of bacterial resistance pathways using multivalent quaternary ammonium functionalized macromolecules. Metabolomics 16, 82 (2020). https://doi.org/10.1007/s11306-020-01702-1
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DOI: https://doi.org/10.1007/s11306-020-01702-1