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- W2057328273 abstract "The ability of a large number of cellular metabolites to release iron from transferrin was investigated by measuring the rate at which they could mediate iron exchange between two types of transferrin. Rabbit transferrin labelled with 59Fe was incubated with human apotransferrin in the presence of the metabolites. After varying periods of incubation the human transferrin was separated from the rabbit transferrin by immunoprecipitation. GTP, 2,3-diphosphoglycerate, ATP, ADP and citrate produced the most rapid exchange of iron between the two types of transferrin, but many other compounds showed some degree of activity. Iron exchange mediated by the organic phosphates had the characteristics of a single first-order reaction and was sensitive to changes of incubation temperature and pH. The activation energy for the exchange reaction was approx. 13 kcal/mol. The rate of iron exchange from the oxalate - iron - transferrin complex was much lower than from bicarbonate - iron - transferrin. It is concluded that several organic phosphates have the capacity of releasing iron from transferrin. These compounds may represent the means by which the iron is released during the process of cellular uptake." @default.
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- W2057328273 date "1977-08-25" @default.
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- W2057328273 title "Iron exchange between transferrin molecules mediated by phosphate compounds and other cell metabolites" @default.
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- W2057328273 doi "https://doi.org/10.1016/0304-4165(77)90239-2" @default.
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