This family represents beta-1,4-mannosyl-glycoprotein beta-1,4-N-acetylglucosaminyltransferase (EC:2.4.1.144). This enzyme transfers the bisecting GlcNAc to the core mannose of complex N-glycans. The addition of this residue is regulated during development and has functional consequences for receptor signalling, cell adhesion, and tumour progression [1,2].

1: Truncated, inactive N-acetylglucosaminyltransferase III (GlcNAc-TIII) induces neurological and other traits absent in mice that lack GlcNAc-TIII. Bhattacharyya R, Bhaumik M, Raju TS, Stanley P; J Biol Chem 2002;277:26300-26309. PMID:11986323

2: A catalytically inactive beta 1,4-N-acetylglucosaminyltransferase III (GnT-III) behaves as a dominant negative GnT-III inhibitor. Ihara H, Ikeda Y, Koyota S, Endo T, Honke K, Taniguchi N; Eur J Biochem 2002;269:193-201. PMID:11784313