Sulfate ion (SO₄²⁻)

The sulfate ion (SO₄²⁻) is a polyatomic anion consisting of a central sulfur atom in the +6 oxidation state bonded tetrahedrally to four oxygen atoms, each in the -2 state, resulting in a -2 overall charge. It serves essential roles in human physiology as the fourth most abundant anion in plasma, supporting phase II detoxification via sulfotransferases that sulfonate xenobiotics, steroids, proteins, and proteoglycans to enhance solubility and excretion. Sulfate is endogenously produced from metabolism of sulfur-containing amino acids like methionine and cysteine, and it is absorbed from diet, with transporters from the SLC26 family facilitating cellular uptake. In plants and microbes, sulfate undergoes assimilatory reduction to sulfide for cysteine synthesis, involving enzymes like ATP sulfurylase and APS reductase localized in plastids. Defects in sulfate metabolism, such as sulfite oxidase deficiency, lead to severe developmental issues including physical deformities and neurological impairment due to toxic sulfite accumulation. While not a therapeutic target like receptors or enzymes, sulfate levels are monitored as biomarkers, and it functions in osmotic laxative activity without direct drug targeting. Its mineral forms exhibit geological properties like variable solubility and low hardness, but biological relevance centers on metabolic activation rather than direct pharmacologic modulation.

Other names

sulphate ionsulfate anion