LALBA
Function
Regulatory subunit of lactose synthase, changes the substrate specificity of galactosyltransferase in the mammary gland making glucose a good acceptor substrate for this enzyme. This enables LS to synthesize lactose, the major carbohydrate component of milk. In other tissues, galactosyltransferase transfers galactose onto the N-acetylglucosamine of the oligosaccharide chains in glycoproteins.
Sequence Similarities
Belongs to the glycosyl hydrolase 22 family.
Tissue Specificity
Mammary gland specific. Secreted in milk.
Cellular localization
- Secreted
Alternative names
ALACTA, LALBA, Alpha-lactalbumin, Lactose synthase B protein