Trehalose and α-glucan mediate distinct abiotic stress responses in Pseudomonas aeruginosa

Woodcock, Stuart D., Syson, Karl, Little, Richard H., Ward, Danny, Sifouna, Despoina, Brown, James K. M., Bornemann, Stephen and Malone, Jacob G. (2021) Trehalose and α-glucan mediate distinct abiotic stress responses in Pseudomonas aeruginosa. PLoS Genetics, 17 (4). ISSN 1553-7404

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Abstract

An important prelude to bacterial infection is the ability of a pathogen to survive independently of the host and to withstand environmental stress. The compatible solute trehalose has previously been connected with diverse abiotic stress tolerances, particularly osmotic shock. In this study, we combine molecular biology and biochemistry to dissect the trehalose metabolic network in the opportunistic human pathogen Pseudomonas aeruginosa PAO1 and define its role in abiotic stress protection. We show that trehalose metabolism in PAO1 is integrated with the biosynthesis of branched α-glucan (glycogen), with mutants in either biosynthetic pathway significantly compromised for survival on abiotic surfaces. While both trehalose and α-glucan are important for abiotic stress tolerance, we show they counter distinct stresses. Trehalose is important for the PAO1 osmotic stress response, with trehalose synthesis mutants displaying severely compromised growth in elevated salt conditions. However, trehalose does not contribute directly to the PAO1 desiccation response. Rather, desiccation tolerance is mediated directly by GlgE-derived α-glucan, with deletion of the glgE synthase gene compromising PAO1 survival in low humidity but having little effect on osmotic sensitivity. Desiccation tolerance is independent of trehalose concentration, marking a clear distinction between the roles of these two molecules in mediating responses to abiotic stress.

Item Type: Article
Uncontrolled Keywords: ecology, evolution, behavior and systematics,molecular biology,genetics,genetics(clinical),cancer research ,/dk/atira/pure/subjectarea/asjc/1100/1105
Faculty \ School: Faculty of Science > School of Biological Sciences
Faculty of Medicine and Health Sciences > Norwich Medical School
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Depositing User: LivePure Connector
Date Deposited: 05 May 2021 00:03
Last Modified: 12 Jun 2021 12:12
URI: https://ueaeprints.uea.ac.uk/id/eprint/79922
DOI: 10.1371/journal.pgen.1009524

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