Abstract
The iron-transferring activity of iron-binding fragments FeNF and FeCF, representing the NH2- and CO2H-terminal domains of iron-ovotransferrin (Fe2OT), with a chicken embryo red cell system, was investigated. Each fragment is able to deliver iron to a chicken embryo red cell system for the biosynthesis of heme, FeNF being 44% more efficient than FeCF. The Fe fragments are on an average approximately 2 times less effective in delivering iron to the chicken embryo red cell than Fe2OT. The binding of FeNF and FeCF to CERC is essentially identical in terms of apparent association constant (K = 1.5 X 10(6) M-1, with respect to fragments) and the number of binding sites per cell at equilibrium (n = 2.9 X 10(4)); however, they differ significantly in their rates of delivering iron for heme synthesis.
Highlights
The iron-transferring activity of iron-binding frag- and human lactofenin are functionally identical
Transferrins are a group of homologous iron-binding gly- Preparation of Chicken Embryo Red Cells-CERCs were obtained coproteins (M, =: 80,000) which are widely distributedin essentially according to the procedure described by Williams and various biological fluids [1,2]
A decrease in the iron uptake during maturation of erythroid cellshas been proposed to be due to thleoss of transferrin receptors from the cell membrane [19, 20]
Summary
IRON-TRANSFERRING ACTIVITY OF IRON-BINDING FRAGMENTS OF OVOTRANSFERRIN WITH CHICKEN EMBRYO RED CELLS*. Transferrins are a group of homologous iron-binding gly- Preparation of Chicken Embryo Red Cells-CERCs were obtained coproteins (M, =: 80,000) which are widely distributedin essentially according to the procedure described by Williams and various biological fluids [1,2]. They possess two binding sites for ferric ion and areinvolved in the transportof iron to the developing red cells for the synthesis of hemoglobin
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