MGAT4B: Proteins and Enzymes

MGAT4B, also known as Alpha-1,3-mannosyl-glycoprotein 4-beta-N-acetylglucosaminyltransferase B, has 3 isoforms, a 548 amino acid isoform that is 63 kDa, a 547 amino acid isoform that is 63 kDa, and a 563 amino acid isoform that is 65 kDa; participates in the transfer of N-acetylglucosamine (GlcNAc) to the core mannose residues of N-linked glycans; acts as a catalyzer in the formation of the GlcNAcbeta1-4 branch on the GlcNAcbeta1-2Manalpha1-3 arm of the core structure of N-linked glycans; necessary for the production of tri- and tetra-antennary N-linked sugar chains, and it is not the main contributor in N-glycan biosynthesis. Disease research is currently being performed with relation to MGAT4B and immunodeficiency, pancreatic cancer, hepatocellular carcinoma, pancreatitis, interferon, carcinoma, and extrahepatic bile duct carcinoma. Interactions with this protein have been shown to involve LRSAM1, MGAT2, MGAT3, MGAT5, FUT8, and MGAT5B in N-glycan antennae elongation in the medial/trans-Golgi, transport to the Golgi and subsequent modification, asparagine N-linked glycosylation, N-Glycan antennae elongation, methabolism of proteins, N-Glycan biosynthesis, and metabolic pathways.