{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nHuman serum transferrin (TF) is a multifunctional iron‐binding glycoprotein that governs iron homeostasis by reversibly sequestering ferric ions and delivering them to cells via receptor‐mediated endocytosis. Its structure–function relationships have been dissected at the atomic level—revealing distinct binding motifs and conformational states that regulate iron uptake and release in a pH‐dependent manner."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "6"}]}, {"type": "t", "text": " In addition to its canonical role in systemic iron delivery—as evidenced by high-resolution structures and computational as well as kinetic studies"}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "10"}]}, {"type": "t", "text": "—TF function is dynamically modulated by its interaction with specific receptors (TfR1, TfR2) and accessory proteins (such as HFE), which in turn influence iron‐regulated processes including hepcidin transcription and cellular iron release."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "11", "end_ref": "14"}]}, {"type": "t", "text": " Moreover, variations in the TF gene and its glycoforms have been implicated in modulation of serum markers of iron status, brain iron deposition, and associated neurodegenerative disorders such as Alzheimer’s and Parkinson’s disease."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "15", "end_ref": "20"}]}, {"type": "t", "text": " TF’s role as a target for innovative therapeutic platforms is also highlighted by its use in engineered nanocarriers for traversing the blood–brain barrier"}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "21", "end_ref": "23"}]}, {"type": "t", "text": "and by its exploitation by pathogens to hijack host iron."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "24"}]}, {"type": "t", "text": " In addition, numerous clinical and genetic studies have linked TF and its regulatory mechanisms to metabolic conditions, altered transferrin saturation and glycosylation patterns associated with diabetes, alcoholic liver damage, and central nervous system disorders."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "26", "end_ref": "28"}, {"type": "fg_f", "ref": "9"}, {"type": "fg_f", "ref": "29"}, {"type": "fg_f", "ref": "5"}, {"type": "fg_fs", "start_ref": "31", "end_ref": "36"}, {"type": "fg_f", "ref": "4"}, {"type": "fg_f", "ref": "37"}, {"type": "fg_f", "ref": "10"}, {"type": "fg_f", "ref": "20"}, {"type": "fg_f", "ref": "6"}, {"type": "fg_f", "ref": "3"}, {"type": "fg_f", "ref": "38"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn contrast, tissue factor (TF) is a distinct protein that functions as the primary initiator of the coagulation cascade, triggering thrombin generation and subsequent fibrin clot formation. 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