The primary plasma iron transporter, bound to two ferric ions, which facilitates the distribution of iron from absorption sites to tissues throughout the body.
Role of protein in biology
Transferrin is a multifunctional monomeric glycoprotein primarily synthesized in the liver and found abundantly in plasma, where it plays a central role in iron metabolism and homeostasis. Each transferrin molecule can reversibly bind two ferric (Fe³⁺) ions with high affinity, facilitating the safe transport and regulated distribution of iron from absorption sites in the gut and macrophages to tissues throughout the body, especially to the bone marrow for hemoglobin synthesis. This iron delivery is mediated through transferrin receptors on cell surfaces, enabling receptor-mediated endocytosis and precise cellular iron uptake.
Beyond iron transport, transferrin possesses significant antimicrobial properties by sequestering free iron, thereby limiting its availability to bacteria and fungi-a process that contributes to innate immune defense and exhibits bacteriostatic and fungistatic effects.
Common research uses
Holo-Transferrin is widely used in clinical and biomedical research related to iron metabolism and transport. Altered transferrin levels are associated with several physiological and pathological conditions. Elevated levels are commonly observed in iron-deficiency anemia and pregnancy, while decreased levels may occur in inflammatory diseases, nephrotic syndrome, and hypoproteinemia. Rare genetic disorders such as atransferrinemia result in severe anemia and abnormal tissue iron accumulation due to impaired transferrin function.
In diagnostic and biotechnology applications, transferrin serves as an important biomarker for evaluating iron status and metabolic disorders and is frequently incorporated into cell culture media to support optimal cell growth and viability. The transferrin–transferrin receptor pathway is also actively studied for targeted drug delivery, including strategies designed to transport therapeutics across the blood–brain barrier.
Common uses include: IVD assay standards, calibrators, and controls; Iron metabolism and transport studies and Receptor-mediated drug delivery research.
ZJ26F0636836