Abstract
Pseudomonas spp. are the main producers of rhamnolipids. These products have applications in pharmaceuticals, cosmetics, food industry and bioremediation. The biosynthesis of rhamnolipids is influenced by nutrient composition, pH and temperature. In this study, the impact of nutrients on the expression levels of rhamnolipid synthesis genes was evaluated in P. aeruginosa ATCC 15442. Glucose and glycerol were used as carbon sources; while, NaNO3, NH4NO3 and yeast extract/peptone were employed as nitrogen sources. The effect of different concentrations of Fe2+ and Fe3+ on rhamnolipid synthesis genes was also evaluated. Highest biosurfactant production was obtained in minimal medium supplemented with glucose, NaNO3 and Fe2+. Two rhamnolipid synthesis genes, rhlA and rhlB, were amplified with PCR. CapLC ESI–Ion trap-MS/MS detected only mono-rhamnolipid Rha–C10–C10 in the extract. Although similar induction levels were recorded in the presence of 0.05 g/L iron ions, the presence of Fe2+ resulted in higher expression levels than Fe3+ at concentrations equivalent to 0.025 and 0.075 g/L.
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The authors acknowledge the personals of Ege Microbiological Analysis Laboratory (EGEMIKAL) for providing Pseudomonas aeruginosa ATCC 15442.
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Communicated by Erko Stackebrandt.
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Shatila, F., Diallo, M.M., Şahar, U. et al. The effect of carbon, nitrogen and iron ions on mono-rhamnolipid production and rhamnolipid synthesis gene expression by Pseudomonas aeruginosa ATCC 15442. Arch Microbiol 202, 1407–1417 (2020). https://doi.org/10.1007/s00203-020-01857-4
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DOI: https://doi.org/10.1007/s00203-020-01857-4