Figure 1

Och1p in N-glycan biosynthesis.
In the Golgi, the α-1,6-mannosyltransferase activity (α-1,6-MnT) of Och1p extends the N-linked Man8GlcNAc2 core glycan, which is then heterogeneously hyperglycosylated by several additional (phospho-) mannosyltransferases (MnTs). Galanthus nivalis lectin (GNL) and Lens culinaris lectin (LCA) bind to the different glycan structures either with high (thick arrow) or low (thin arrow) specificity.