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首页> 外文期刊>Environmental Science & Technology >Competitive Binding of Protons, Calcium, Cadmium, and Zinc to Isolated Cell Walls of a Gram-Positive Soil Bacterium
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Competitive Binding of Protons, Calcium, Cadmium, and Zinc to Isolated Cell Walls of a Gram-Positive Soil Bacterium

机译:质子,钙,镉和锌与革兰氏阳性细菌分离细胞壁的竞争结合

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摘要

Metal ion binding to the bacterial cell wall is the first step in the interactions of a metal with a bacterium. Cadmium and zinc ion binding to isolated cell walls of Rhodococcus erythropolis A177 has been studied for a wide range of proton and calcium concentrations. The release of calcium ions and protons during metal ion binding is an indication of the competitive nature of the binding. Calculations, based on the metal binding data and the pH-dependent charging behavior, reveal thatthe cell wall becomes positively charged at high coverage with bivalent ions. A cooperative effect of the presence of calcium on metal ion binding was observed. Apparently, the cell wall structure is altered in the presence of bivalent ions. Since calcium is a dominant bivalent cation in most natural systems, one may regard the calcium as a "structure determining ion". On the basis of a qualitative interpretation of the data, the NICA model was selected for a quantitative description of the data.
机译:金属离子与细菌细胞壁的结合是金属与细菌相互作用的第一步。镉和锌离子结合到红球红球菌A177的分离的细胞壁上,已经研究了多种质子和钙浓度。在金属离子结合过程中钙离子和质子的释放表明了结合的竞争性质。基于金属结合数据和pH依赖的带电行为的计算表明,细胞壁在高覆盖率下被二价离子带正电。观察到钙的存在对金属离子结合的协同作用。显然,在二价离子的存在下细胞壁结构发生了改变。由于钙在大多数天然系统中是占优势的二价阳离子,因此人们可以将钙视为“结构决定离子”。在对数据进行定性解释的基础上,选择了NICA模型进行数据的定量描述。

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