Lactosylceramide 1,3-N-acetyl-beta-D-glucosaminyltransferase (B3GNT5)

Beta-1,3-N-acetylglucosaminyltransferase that plays an integral role in the synthesis of lacto- or neolacto-series carbohydrate chains on glycolipids, especially by participating in biosynthesis of HNK-1 and Lewis X carbohydrate structures. Has strong activity toward lactosylceramide (LacCer) and neolactotetraosylceramide (nLc(4)Cer; paragloboside), resulting in the synthesis of Lc(3)Cer and neolactopentaosylceramide (nLc(5)Cer), respectively.

Probably plays a central role in regulating neolacto-series glycolipid synthesis during embryonic development. .