α-Lactalbumin is a Ca²⁺-binding protein. α-Lactalbumin has a single strong Ca²⁺-binding site and for this reason it frequently serves as a simple model Ca²⁺-binding protein. α-Lactalbumin is a component of lactose synthase, an enzyme system, which consists of galactosyltransferase (GT) and α-Lactalbumin^[1][2].