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Iron‐Binding Properties of TTf, a Salt‐Induced Transferrin from the Alga Dunaliella salina

Iron‐Binding Properties of TTf, a Salt‐Induced Transferrin from the Alga Dunaliella salina,10.1081/PLN-120024266,Journal of Plant Nutrition,Michal Sch

Iron‐Binding Properties of TTf, a Salt‐Induced Transferrin from the Alga Dunaliella salina   (Citations: 5)
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Iron deficiency induces accumulation of a transferrin‐like protein, TTf, in plasma membranes of the halotolerant alga Dunaliella salina. In vivo iron binding and uptake studies provided evidence for the role of TTf in iron acquisition in Dunaliella. In this report, we characterized the iron binding activity of solubilized TTf, purified from plasma membrane vesicles of iron‐starved cells. The characteristics of iron binding to TTf generally resembled those of animal transferrins (Tfs) in an obligatory requirement for bicarbonate as a co‐ligand, specificity for ferric ions and pH dependence of both binding and release. Unlike animal Tfs, Fe binding activity of TTf was stimulated by high NaCl concentrations. The stimulation was not associated with changes in Fe binding affinity. The results unequivocally confirm the role of TTf in Fe binding and uptake in Dunaliella and demonstrate its uniqueness as a membrane‐associated, salt‐stimulated transferrin.
Journal: Journal of Plant Nutrition - J PLANT NUTR , vol. 26, no. 10-11, pp. 2081-2091, 2003
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