Abstract
The biological effects of rare-earth ions on the organism have been studied using Pr3+ as a probe ion and Escherichia coli cell as a target. Atomic force microscopy (AFM) observation of the surface of E. coli cells shows that the presence of Pr3+ substantially changes the structure of the outer membrane. By induced coupled plasma-mass spectrometry (ICP-MS), more Cu2+ was found in the cells grown in the presence of Pr3+, indicating changes of cell permeability. Using energy dispersive X-ray spectroscopy (EDX), Ca2+ is found on the outer surface of the original cell. It is proposed that Pr3+ can replace Ca2+ from the binding sites because of their close ionic radii and similar ligand speciality.
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Acknowledgement
We gratefully acknowledge the financial support of National Natural Science Foundation of China (30570015, 20373051), “973” Project (2004CB719603), Science Fund for Creative Research Group (No.20621502 NSFC), Science Research Foundation of Chinese Ministry of Education (NO: [2006]8IRT0543), Natural Science Foundation of Hubei Province (No.2005ABC02), and Open fund of State Key Laboratory of Advanced Technology for Materials Synthesis and Processing (Wuhan University of Technology, WUT2006M01).
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Peng, L., Weiying, Z., Xi, L. et al. Structural Basis for the Biological Effects of Pr(III) Ions: Alteration of Cell Membrane Permeability. Biol Trace Elem Res 120, 141–147 (2007). https://doi.org/10.1007/s12011-007-8015-5
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DOI: https://doi.org/10.1007/s12011-007-8015-5