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Alpha-Lactalbumin (LA) stimulates milk beta-1,4-galactosyltransferase I (beta4Gal-T1) to transfer glucose from UDP-glucose to N-acetylglucosamine. Crystal structure of beta4Gal-T1cntdotLA complex with UDP-Glc


, : Alpha-Lactalbumin (LA) stimulates milk beta-1,4-galactosyltransferase I (beta4Gal-T1) to transfer glucose from UDP-glucose to N-acetylglucosamine. Crystal structure of beta4Gal-T1cntdotLA complex with UDP-Glc. Journal of Biological Chemistry 276(40): 37665-37671

beta-1,4-Galactosyltransferase 1 (Gal-T1) transfers galactose (Gal) from UDP-Gal to N-acetylglucosamine (Glc-NAc), which constitutes its normal galactosyltransferase (Gal-T) activity. In the presence of alpha-lactalbumin (LA), it transfers Gal to Glc, which is its lactose synthase (LS) activity. It also transfers glucose (Glc) from UDP-Glc to GlcNAc, constituting the glucosyltransferase (Glc-T) activity, albeit at an efficiency of only 0.3-0.4% of Gal-T activity.

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