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TfR1 = transferrin receptor 1 in Human iron metabolism. TfR1 is a transmembrane glycoprotein composed of two disulfide-linked monomers joined by two disulfide bonds. Each monomer binds one holo-transferrin molecule creating an iron-Tf-TfR complex which enters the cell by endocytosis. [9]
Transferrin receptor (TfR) is a carrier protein for transferrin. It is needed for the import of iron into cells and is regulated in response to intracellular iron concentration. It imports iron by internalizing the transferrin-iron complex through receptor-mediated endocytosis . [ 1 ]
Transferrin receptor 2 (TfR2) is a protein that in humans is encoded by the TFR2 gene. [ 5 ] [ 6 ] This protein is involved in the uptake of transferrin -bound iron into cells by endocytosis , although its role is minor compared to transferrin receptor 1 .
Most cell types take up iron primarily through receptor-mediated endocytosis via transferrin receptor 1 (TFR1), transferrin receptor 2 (TFR2) and GAPDH. TFR1 has a 30-fold higher affinity for transferrin-bound iron than TFR2 and thus is the main player in this process.
And more transferrin receptors make it easier for the cell to bring in more iron from transferrin-iron complexes circulating outside the cell. But, as iron binds to more and more IRE-BPs, they change shape and unbind the transferrin receptor mRNA. The transferrin receptor mRNA is rapidly degraded without the IRE-BP attached to it. The cell ...
[1] Blood testing of the soluble transferrin receptor (sTfR) is used as a measure of functional iron status and the investigation of iron deficiency anemia. Ferritin, a routine investigation for anemia, is an acute-phase reactant, and may be elevated in states of inflammation, thereby falsely indicating that iron stores are adequate. [2]
The protein encoded by this gene is an integral membrane protein that is similar to MHC class I-type proteins and associates with beta-2 microglobulin (beta2M). It is thought that this protein functions to regulate circulating iron uptake by regulating the interaction of the transferrin receptor with transferrin.
Iron tests are groups of clinical chemistry laboratory blood tests that are used to evaluate body iron stores or the iron level in blood serum.. Other terms used for the same tests are iron panel, iron profile, iron indices, iron status or iron studies.