Lactose synthase
Definition:
EC Tree > 2 Transferases > 2.4 Glycosyltransferases > 2.4.1 Hexosyltransferases > 2.4.1.22 lactose synthase
Lactose synthase is a mammary-gland enzyme complex of two proteins A and B. The B protein, alpha-lactalbumin, modifies the acceptor specificity of the galactosyltransferase so that, in the presence of alpha-lactalbumin, galactose from UDP-alpha-D-galactose is transferred onto D-glucose, releasing UDP and forming lactose. In the absence of alpha-lactalbumin the same A protein transfers galactose to N-acetylglucosamine (EC 2.4.1.90, N-acetyllactosamine synthase). It occurs in Bacteria and Eukaryota.
Lactose synthase is a mammary-gland enzyme complex of two proteins A and B. The B protein, alpha-lactalbumin, modifies the acceptor specificity of the galactosyltransferase so that, in the presence of alpha-lactalbumin, galactose from UDP-alpha-D-galactose is transferred onto D-glucose, releasing UDP and forming lactose. In the absence of alpha-lactalbumin the same A protein transfers galactose to N-acetylglucosamine (EC 2.4.1.90, N-acetyllactosamine synthase). It occurs in Bacteria and Eukaryota.
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