catalytic activity:UDP-galactose + glycoprotein N-acetyl-D-galactosamine = UDP + glycoprotein D-galactosyl-1,3-N-acetyl-D-galactosamine.,cofactor:Magnesium.,disease:Defects in C1GALT1 may be a cause of susceptibility to IgA nephropathy (IgAN). IgAN is the most common primary glomerulonephritis, which is partly due to aberrant or incomplete galactosylation of IgA1 molecules.,function:Glycosyltransferase that generates the core 1 O-glycan Gal-beta1-3GalNAc-alpha1-Ser/Thr (T antigen), which is a precursor for many extended O-glycans in glycoproteins. Plays a central role in many processes, such as angiogenesis, thrombopoiesis and kidney homeostasis development.,online information:Core1 UDP-galactose:N-acetylgalactosamine-alpha-R beta 1,3-galactosyltransferase,pathway:Protein modification; protein glycosylation.,similarity:Belongs to the glycosyltransferase 31 family. Beta3-Gal-T subfamily.,

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