Siderophores from some pathogens remove iron from the host protein(s) O cytochromes. O transferrin. O lactoferrin. O both lactoferrin and transferrin.
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Iron absorption into mucosal cells of the gut is a simple diffusion process. Hemosiderin is produced by denaturation of ferritin with the loss of some apoprotein. Apotransferrin is a large protein complex capable of binding thousands of iron hydroxide molecules. Iron is transported in blood chiefly as part of ferritin. Oxidizing agents promote the absorption of iron from the intestine.
Adi S.
Iron (Fe) is an essential trace metal that is needed by all cells. It is required, for example, for synthesis of the heme groups and iron-sulfur centers that are part of the active site of many proteins involved in electron-transfer reactions; it is also required in hemoglobin, the main protein in red blood cells. Iron is taken up by cells by receptor-mediated endocytosis. The iron-uptake system has two components: a soluble protein called transferrin, which circulates in the bloodstream; and a transferrin receptor-a transmembrane protein that, like the LDL receptor in Figure $15-33,$ is continually endocytosed and recycled to the plasma membrane. Fe ions bind to transferrin at neutral pH but not at acidic pH. Transferrin binds to the transferrin receptor at neutral $\mathrm{pH}$ only when it has an Fe ion bound, but it binds to the receptor at acidic pH even in the absence of bound iron. From these properties, describe how iron is taken up, and discuss the advantages of this elaborate scheme.
Iron is an essential trace metal that is needed by all cells. Iron is taken into the cells via a two-component system. The transferrin receptor is a membrane protein that is continually endocytosed and recycled back to the plasma membrane. Transferrin is a soluble protein that circulates in the bloodstream and binds free iron at neutral but not acidic pH. At neutral pH, circulating transferrin can bind to the transferrin receptor only if transferrin has iron bound to it. However, at acidic pH, transferrin binds the transferrin receptor even in the absence of iron. Describe the process of iron uptake and the fate of the receptors.
Dominador T.
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