Calcium ion binding by citrate

Citrate binds calcium ions through chelation, a chemical process where a ligand (here, citrate) forms multiple bonds with a metal ion (calcium), resulting in a stable ring-like structure[6][3]. This binding significantly affects calcium bioavailability and plays important physiological roles, notably: - In urine, citrate binding to calcium inhibits the formation and aggregation of calcium oxalate and calcium phosphate crystals, reducing the risk of kidney stone formation[3][1]. - Citrate stabilizes “prenucleation” calcium ion aggregates and amorphous precursors, interfering with pathological or physiological mineralization processes, such as kidney stone or bone mineral formation[1][5]. - The calcium-citrate complex is highly soluble compared to other calcium salts, which prevents it from forming insoluble stones in biological fluids[3]. This entity is not a molecular therapeutic target like a receptor, enzyme, or transporter, but rather describes a chemical interaction between a small molecule (citrate) and an inorganic ion (calcium). The action does not involve signal transduction or biological target-specific pathways typical of drug discovery, though it is physiologically significant and can be modulated through dietary or pharmaceutical citrate[3][7]. Key context: "Calcium ion binding via chelation by citrate ions" is a description of a chemical process, not a specific molecule, gene, or conventional therapeutic target. Thus, it is best classified as an incorrect target for structured pharmacological databases. The biological and clinical importance centers on the prevention of kidney stone formation, with urinary citrate serving as a clinical biomarker and supplement. There are no drugs that “target” this interaction per se; rather, citrate supplements (potassium citrate, sodium citrate) are prescribed to alter urinary chemistry[3]. Summary for structured extraction: This entry is not a conventional biomolecular target. The correct interpretation is a physiologically relevant small molecule–ion interaction, whose significance is primarily in modulation of mineralization and inhibition of pathological crystallization (e.g., in nephrolithiasis), but not through a druggable protein or receptor.

Other names

Calcium chelation by citrateCitrate-calcium bindingCalcium-citrate complex

Chelation (formation of calcium-citrate complexes)