白蛋白（ALB）是血液中最豐富的蛋白質之一，它不僅具有多種重要的生理功能，如維持血容量和血壓、輸送藥物和其他生物分子等，而且還被廣泛應用于臨床診斷和治療。

Binds water, Ca(2+), Na(+), K(+), fatty acids, hormones, bilirubin and drugs. Its main function is the regulation of the colloidal osmotic pressure of blood. Major zinc transporter in plasma, typically binds about 80% of all plasma zinc. Major calcium and magnesium transporter in plasma, binds approximately 45% of circulating calcium and magnesium in plasma. Potentially has more than two calcium-binding sites and might additionally bind calcium in a non-specific manner. The shared binding site between zinc and calcium at residue Asp-272 suggests a crosstalk between zinc and calcium transport in the blood. The rank order of affinity is zinc > calcium > magnesium. Binds to the bacterial siderophore enterobactin and inhibits enterobactin-mediated iron uptake of E.coli from ferric transferrin, and may thereby limit the utilization of iron and growth of enteric bacteria such as E.coli. Does not prevent iron uptake by the bacterial siderophore aerobactin.

1. We have purified SSA from sheep kidneys by a simple and efficient two-step purification procedure. Further, we have studied urea-induced denaturation of SSA by monitoring changes in the difference absorption coefficient at 287nm intrinsic fluorescence emission intensity and mean residue ellipticity at 222nm at pH 7.4 and 25 degrees C PMID: 27180298

Secreted.

ALB/AFP/VDB family

Plasma.

KEGG: oas:443393

UniGene: Oar.449