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首页> 外文期刊>Applied Microbiology >Effect of Inorganic and Organic Ligands on the Bioavailability of Methylmercury as Determined by Using a mer-lux Bioreporter
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Effect of Inorganic and Organic Ligands on the Bioavailability of Methylmercury as Determined by Using a mer-lux Bioreporter

机译:通过使用mer-lux生物报告仪确定的无机和有机配体对甲基汞生物利用度的影响

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A mer-lux bioreporter was constructed to assess the bioavailability of methylmercury [CH_(3)Hg(II)] in Escherichia coli . The bioreporter was shown to be sensitive, with a detection limit of 2.5 nM CH_(3)Hg(II), and was used to investigate the effects of chlorides, humic acids, and thiols on the bioavailability of CH_(3)Hg(II) in E. coli . It was found that increasing the concentration of chlorides resulted in an increase in CH_(3)Hg(II) bioavailability, suggesting that there was passive diffusion of the neutral complex (CH_(3)HgCl~(0)). Humic acids were found to reduce the bioavailability of CH_(3)Hg(II) in varying degrees. Complexation with cysteine resulted in increased bioavailability of CH_(3)Hg(II), while assays with equivalent concentrations of methionine and leucine had little or no effect on bioavailability. The mechanism of uptake of the mercurial-cysteine complexes is likely not passive diffusion but could result from the activities of a cysteine transport system. The bioavailability of CH_(3)Hg(II) decreased with increasing glutathione concentrations.
机译:构建了一个lux-lux生物报告基因,以评估甲基汞[CH_(3)Hg(II)]在大肠杆菌中的生物利用度。该生物报告物显示灵敏度高,检出限为2.5 nM CH_(3)Hg(II),用于研究氯化物,腐殖酸和硫醇对CH_(3)Hg(II)生物利用度的影响。 )在大肠杆菌中。发现增加氯化物的浓度导致CH_(3)Hg(II)的生物利用度增加,表明中性复合物(CH_(3)HgCl〜(0))有被动扩散。发现腐殖酸在不同程度上降低了CH_(3)Hg(II)的生物利用度。与半胱氨酸的络合导致CH_(3)Hg(II)的生物利用度增加,而当量浓度的蛋氨酸和亮氨酸测定对生物利用度影响很小或没有影响。汞-半胱氨酸复合物的摄取机制可能不是被动扩散,而是由半胱氨酸转运系统的活性引起。 CH_(3)Hg(II)的生物利用度随谷胱甘肽浓度的增加而降低。

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