{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nS100A1 is a key Ca²⁺‐binding protein that plays a central role in cardiovascular physiology. In the myocardium, increased S100A1 expression improves contractile performance and restores Ca²⁺ homeostasis by enhancing sarcoplasmic reticulum (SR) Ca²⁺ uptake, reducing SR Ca²⁺ leak, normalizing intracellular Ca²⁺ and Na⁺ levels, and thereby rescuing failing cardiomyocytes. Gene‐transfer studies in animal models have shown that replenishing S100A1 can reverse contractile dysfunction and protect the heart under both acute and chronic hemodynamic stress. Moreover, S100A1 in endothelial cells is essential for proper activation of endothelial nitric oxide synthase, while extracellular S100A1 taken up by cardiomyocytes activates pro‐survival pathways and serves as an “alarmin” following myocardial infarction."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nStructural studies have revealed that like other EF‐hand proteins, S100A1 undergoes a dramatic Ca²⁺‐dependent conformational change that exposes a hydrophobic cleft for target interaction. High‐resolution NMR and molecular dynamics analyses of Ca²⁺‐bound versus apo forms – and even posttranslationally modified variants such as thionylated S100A1 – have provided insights into its structural dynamics and its ability to interact with target peptides (for example, derived from CapZ) as well as maintain its homodimeric organization. Such detailed structural characterizations provide the molecular basis for its functional versatility."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "13", "end_ref": "16"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its role in Ca²⁺ handling, S100A1 participates in the fine‐tuning of intracellular signaling networks through protein–protein interactions. In vitro binding studies have shown that S100A1 selectively interacts with monomeric p53, suggesting a potential role in modulating p53 tetramerization and transcriptional activity. In addition, S100A1 can associate with regulatory proteins such as protein phosphatase 5 (PP5), thereby influencing dephosphorylation events, and it is implicated in modulating the activity of ion channels such as TRPC6 as well as receptor complexes involving the RAGE V domain – interactions that may ultimately affect cell proliferation and survival."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "17", "end_ref": "21"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nS100A1 also influences the function of other contractile and differentiating tissues and has emerged as a biomarker in several cancers. In skeletal muscle fibers, its interactions enhance SR Ca²⁺ release and improve force generation. During chondrocyte maturation, S100A1, along with its close homolog S100B, is transcriptionally induced by the SOX trio to inhibit terminal differentiation and mineralization. Furthermore, differential S100A1 expression serves as a diagnostic marker in renal neoplasms and nephrogenic adenoma, and its aberrant upregulation has been associated with ovarian cancer, nasopharyngeal carcinoma, and melanoma progression."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "22", "end_ref": "34"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAdditional functional attributes of S100A1 include its capacity to act as a molecular chaperone under cellular stress. In cultured cells, overexpression of S100A1 safeguards various enzymes from heat‐induced aggregation and inactivation, a function remarkable for its contribution to protein stability and cell survival."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "35"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Xiao-Jun Du, Timothy J Cole, Nora Tenis, et al. 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