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Ultrastructural and Intracellular Chemical Changes of a Novel Halophilic Strain V430 of Staphylococcus saprophyticus under CaCl2 Stress

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Abstract

Observation of the ultrastructural and intracellular chemical changes of CaCl2-tolerant strains is important both for understanding their adaptation mechanism under high salt stress and for providing theoretical basis of their application in treating high-CaCl2 wastewaters. A novel strain V 430 isolated by us has been successfully used to decrease the chemical oxygen demand (COD) concentration of diosgenin wastewater from 20 g l−1 to less than 0.5 g l−1. For this study, strain V430 was incubated in culture media of different CaCl2 concentrations (up to 9.0%). Strain V430 cells incubated in media of high CaCl2 concentration excreted extracellular substances and accumulated intracellular Ca2+ and K+ and free amino acids. The levels of intracellular cations and free amino acids increased with increase in CaCl2 concentration of the medium. The increase in total free amino acids was mostly due to accumulation of glutamic acid. The strain cells under 9.0% CaCl2 stress took up K+ in a short time, while accumulation of Ca2+ proceeded over the whole growth process.

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Acknowledgements

This work was funded jointly by National Natural Science Foundation of China (Grant for Outstanding Youth No.40425001) and the Ministry of Science and Technology of China (2004AA601050). We also thank Wuhan Institute of Virology, Chinese Academy of Science for the TEM analysis.

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  1. School of Environmental Studies and Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan, 430074, China

    Xin Xin & Yanxin Wang

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  1. Xin Xin
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  2. Yanxin Wang
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Correspondence to Yanxin Wang.

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Xin, X., Wang, Y. Ultrastructural and Intracellular Chemical Changes of a Novel Halophilic Strain V430 of Staphylococcus saprophyticus under CaCl2 Stress. Appl Biochem Biotechnol 142, 298–306 (2007). https://doi.org/10.1007/s12010-007-0038-z

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  • DOI: https://doi.org/10.1007/s12010-007-0038-z

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