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  • Title: Studies on the forms of iron-transferrin released from rabbit reticulocytes.
    Author: Loh TT.
    Journal: Life Sci; 1983 Feb 21; 32(8):915-20. PubMed ID: 6827918.
    Abstract:
    Measurement of the distribution of the four species of transferrin, viz, apotransferrin, diferric transferrin and the two monoferric transferrin, before and after incubation of iron-rich rabbit transferrin with rabbit reticulocytes showed that not all transferrin released from the cells were in the form of apotransferrin. Instead, a mixture of all four species of the protein was released with apotransferrin and C-terminal monoferric transferrin being the major fractions. The buffer solution containing 125I-labelled transferrin showed a continuous gain in percentages in apotransferrin and C-terminal monoferric transferrin after each incubation with reticulocytes. The N-terminal monoferric transferrin, however, remained unchanged suggesting that in the process of transferrin uptake by cells, the diferric transferrin releases its iron from the acid-labile site at N-domain first before the other iron from the acid-stable site.
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