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• W1540690626 startingPage "6904" @default.
• W1540690626 abstract "The requirements of lipophilic ions in the extraction of Ca/sup 2 +/ into an organic phase mediated by the delipidated calcium ionophore protein (calciphorin) have been investigated. It was found that the extraction of Ca/sup 2 +/ into an organic phase mediated by the delipidated calciphorin requires the presence of a lipophilic anion, picrate. Picrate also enhances the rate of calciphorin-mediated Ca/sup 2 +/ translocation through a bulk organic phase. The relative cation selectivity of calciphorin determined from the organic solvent extraction experiments is Zn/sup 2 +/ > Ca/sup 2 +/, Sr/sup 2 +/ > Mn/sup 2 +/. The delipidated calciphorin becomes more hydrophobic in the presence of Ca/sup 2 +/ and alkaline pH in the organic solvent extraction experiments. The pH profile of the mole ratio of Ca/sup 2 +/ to calciphorin exhibits a typical titration curve, showing a pK/sub a/ of 8.0 to 8.1. Ruthenium red and La/sup 3 +/ are shown to inhibit calciphorin-mediated Ca/sup 2 +/ extraction into the organic phase. The respiratory inhibitors, the mitochondrial ATPase inhibitor, and the uncoupling agent have no effect on the Ca/sup 2 +/ extraction. Phosphate does not stimulate calciphorin-mediated Ca/sup 2 +/ extraction. The Ca/sup 2 +/.calciphorin complex appearsmore » to have two positive charges. The delipidated calciphorin only has one class of Ca/sup 2 +/-binding sites as revealed from the flow dialysis studies. These Ca/sup 2 +/-binding sites have a dissociation constant of 5.2 ..mu..M and bound 1 mol of Ca/sup 2 +//mol of calciphorin. Evidence suggests that calciphorin may be a strong candidate for the Ca/sup 2 +/ carrier responsible for the influx mechanism in the mitochondrial Ca/sup 2 +/ transport system.« less" @default.
• W1540690626 created "2016-06-24" @default.
• W1540690626 creator A5012825132 @default.
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• W1540690626 date "1980-07-01" @default.
• W1540690626 modified "2023-09-27" @default.
• W1540690626 title "The electrophoretic properties of a Ca2+ carrier isolated from calf heart inner mitochondrial membrane." @default.
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• W1540690626 doi "https://doi.org/10.1016/s0021-9258(18)43660-5" @default.
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