Beta-1,3-N-Acetylglucosaminyltransferase 9 (b3GNT9)

b3GNT9 gelongs to the glycosyltransferase 31 family. The GT31 glycosyltransferases appear to transfer hexosyl monosaccharides in β-1,3. This generalization is based on the well-characterized mammalian members. The chondroitin sulphate transferases that posses β-1,4-transferase activity belong in the family because they are dual function and also have β-1,3-transferase activity. A large group of mammalian members are the fringe GTs, which are N-acetyl-glucosaminyltransferases. The fringe-related GTs in GT31 form Group A, which is distinct from the non-fringe related GTs in Groups B to F. It is generally assumed that the plant members of family GT31 comprise activities involved in adding galactosyl units in β-1,3 to N-glycans, to O-glycans of AGPs and to pectic type-II arabinogalactans.