TfR (Transferrin R): Proteins and Enzymes

Transferrin Receptor (TfR, TfR-1, CD71) is a transmembrane glycoprotein expressed on erythroid progenitors, muscle cells and proliferating cells as a disulfide-linked homodimer. As the major mediator of cellular iron uptake, it binds and internalizes diferric transferrin, allowing iron release at the low pH of the endosome. Proteolytic shedding of TfR into the circulation is enhanced by iron deficiency. The hereditary hemochromatosis protein HFE competes with diferric transferrin for binding to ...