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Klebsiella planticola strain DSZ mineralizes simazine: physiological adaptations involved in the process

  • Environmental Biotechnology
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Abstract

We examined the ability of a soil bacterium, Klebsiella planticola strain DSZ, to degrade the herbicide simazine (SZ). Strain DSZ is metabolically diverse and grows on a wide range of s-triazine and aromatic compounds. DSZ cells grown in liquid medium with SZ (in 10 mM ethanol) as carbon source mineralized 71.6±1.3% of 0.025 mM SZ with a yield of 4.6±0.3 μg cell dry weight mmol−1 carbon. The metabolites produced by DSZ during SZ degradation included ammeline, cyanuric acid, N-formylurea and urea. We studied the physiological adaptations which allow strain DSZ to metabolize SZ. Using scanning electron microscopy, we detected DSZ cells covering the surfaces of SZ crystals when the herbicide was used at high concentrations (0.1 mM). The membrane order observed by FTIR spectroscopy showed membrane activity at low temperature (4°C) to assimilate the herbicide. Membrane fatty acid analysis demonstrated that strain DSZ adapted to grow on SZ by increasing the degree of saturation of membrane lipid fatty acid; and the opposite effect was detected when both SZ and ethanol were used as carbon sources. This confirms the modulator effect of ethanol on membrane fluidity.

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Acknowledgements

This research was supported by the Ministerio de Ciencia y Tecnología, Spain (project AGL2002-04003-C03-AGR) and the Comunidad Autonoma de Madrid (grant 08.8/0006/2001).

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Correspondence to Margarita Martín.

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Sánchez, M., Garbi, C., Martínez-Álvarez, R. et al. Klebsiella planticola strain DSZ mineralizes simazine: physiological adaptations involved in the process. Appl Microbiol Biotechnol 66, 589–596 (2005). https://doi.org/10.1007/s00253-004-1735-y

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  • DOI: https://doi.org/10.1007/s00253-004-1735-y

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