Trehalose and α-glucan mediate distinct abiotic stress responses in Pseudomonas aeruginosa
Autoři:
Stuart D. Woodcock aff001; Karl Syson aff002; Richard H. Little aff001; Danny Ward aff001; Despoina Sifouna aff003; James K. M. Brown aff004; Stephen Bornemann aff002; Jacob G. Malone aff001
Působiště autorů:
Department of Molecular Microbiology, John Innes Centre, Norwich, United Kingdom
aff001; Department of Biological Chemistry, John Innes Centre, Norwich, United Kingdom
aff002; School of Biological Sciences, University of East Anglia, Norwich, United Kingdom
aff003; Department of Crop Genetics, John Innes Centre, Norwich, United Kingdom
aff004
Vyšlo v časopise:
Trehalose and α-glucan mediate distinct abiotic stress responses in Pseudomonas aeruginosa. PLoS Genet 17(4): e1009524. doi:10.1371/journal.pgen.1009524
Kategorie:
Research Article
doi:
https://doi.org/10.1371/journal.pgen.1009524
Souhrn
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.
Klíčová slova:
Biosynthesis – Glucose – Glycogens – NMR spectroscopy – Osmotic shock – Pseudomonas – Pseudomonas aeruginosa – Trehalose
Zdroje
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