Impacts of Metabolism and Organic Acids on Cell Wall Composition and Pseudomonas aeruginosa Susceptibility to Membrane Active Antimicrobials

Journal article


Manzo, G., Gianfanti, F., Hind, C.K., Allison, L., Clarke, M., Hohenbichler, J., Limantoro, I., Martin, B., Do Carmo Silva, P., Ferguson, P.M., Hodgson-Casson, A., Fleck, R.A., Sutton, J., Phoenix, D.A. and Mason, A. (2021). Impacts of Metabolism and Organic Acids on Cell Wall Composition and Pseudomonas aeruginosa Susceptibility to Membrane Active Antimicrobials. ACS Infectious Diseases. 7 (8), pp. 2310-2323. https://doi.org/10.1021/acsinfecdis.1c00002
AuthorsManzo, G., Gianfanti, F., Hind, C.K., Allison, L., Clarke, M., Hohenbichler, J., Limantoro, I., Martin, B., Do Carmo Silva, P., Ferguson, P.M., Hodgson-Casson, A., Fleck, R.A., Sutton, J., Phoenix, D.A. and Mason, A.
Abstract

Reliable antimicrobial susceptibility testing is essential in informing both clinical antibiotic therapy decisions and the development of new antibiotics. Mammalian cell culture media have been proposed as an alternative to bacteriological media, potentially representing some critical aspects of the infection environment more accurately. Here, we use a combination of NMR metabolomics and electron microscopy to investigate the response of Escherichia coli and Pseudomonas aeruginosa to growth in differing rich media to determine whether and how this determines metabolic strategies, the composition of the cell wall, and consequently susceptibility to membrane active antimicrobials including colistin and tobramycin. The NMR metabolomic approach is first validated by characterizing the expected E. coli acid stress response to fermentation and the accompanying changes in the cell wall composition, when cultured in glucose rich mammalian cell culture media. Glucose is not a major carbon source for P. aeruginosa but is associated with a response to osmotic stress and a modest increase in colistin tolerance. Growth of P. aeruginosa in a range of bacteriological media is supported by consumption of formate, an important electron donor in anaerobic respiration. In mammalian cell culture media, however, the overall metabolic strategy of P. aeruginosa is instead dependent on consumption of glutamine and lactate. Formate doping of mammalian cell culture media does not alter the overall metabolic strategy but is associated with polyamine catabolism, remodelling of both inner and outer membranes, and a modest sensitization of P. aeruginosa PAO1 to colistin. Further, in a panel of P. aeruginosa isolates an increase between 2- and 3-fold in sensitivity to tobramycin is achieved through doping with other organic acids, notably propionate which also similarly enhances the activity of colistin. Organic acids are therefore capable of nonspecifically influencing the potency of membrane active antimicrobials.

Year2021
JournalACS Infectious Diseases
Journal citation7 (8), pp. 2310-2323
PublisherAmerican Chemical Society (ACS)
ISSN2373-8227
Digital Object Identifier (DOI)https://doi.org/10.1021/acsinfecdis.1c00002
Funder/ClientEngineering and Physical Sciences Research Council
Medical Research Council
Publication dates
Online30 Jul 2021
Publication process dates
Accepted03 Jan 2021
Deposited10 Aug 2021
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Open
Licensehttps://creativecommons.org/licenses/by/4.0/
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