Effect of temperature on Burkholderia pseudomallei growth, proteomic changes, motility and resistance to stress environments.


Paksanont, S; Sintiprungrat, K; Yimthin, T; Pumirat, P; Peacock, SJ; Chantratita, N; (2018) Effect of temperature on Burkholderia pseudomallei growth, proteomic changes, motility and resistance to stress environments. Scientific reports, 8 (1). p. 9167. ISSN 2045-2322 DOI: https://doi.org/10.1038/s41598-018-27356-7

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Abstract

Burkholderia pseudomallei is a flagellated, gram-negative environmental bacterium that causes melioidosis, a severe infectious disease of humans and animals in tropical areas. We hypothesised that B. pseudomallei may undergo phenotypic adaptation in response to an increase in growth temperature. We analysed the growth curves of B. pseudomallei strain 153 cultured in Luria-Bertani broth at five different temperatures (25 °C-42 °C) and compared the proteomes of bacteria cultured at 37 °C and 42 °C. B. pseudomallei exhibited the highest growth rate at 37 °C with modest reductions at 30 °C, 40 °C and 42 °C but a more marked delay at 25 °C. Proteome analysis revealed 34 differentially expressed protein spots between bacterial cultures at 42 °C versus 37 °C. These were identified as chaperones (7 spots), metabolic enzymes (12 spots), antioxidants (10 spots), motility proteins (2 spots), structural proteins (2 spots) and hypothetical proteins (1 spot). Of the 22 down-regulated proteins at 42 °C, redundancy in motility and antioxidant proteins was observed. qRT-PCR confirmed decreased expression of fliC and katE. Experiments on three B. pseudomallei strains demonstrated that these had the highest motility, greatest resistance to H<sub>2</sub>O<sub>2</sub> and greatest tolerance to salt stress at 37 °C. Our data suggest that temperature affects B. pseudomallei motility and resistance to stress.

Item Type: Article
Faculty and Department: Faculty of Infectious and Tropical Diseases > Dept of Pathogen Molecular Biology
Research Centre: Antimicrobial Resistance Centre (AMR)
PubMed ID: 29907803
URI: http://researchonline.lshtm.ac.uk/id/eprint/4648175

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