Protein glycosylation
1. Assembly of the precursor
oligosaccharide…
IMPORTANT POINTS:
Assembly takes place on the carrier
lipid dolichol, anchored in the ER
membane.
A pyrophosphate bridge joins the
1st sugar to the dolichol.
Sugars are added singly and
sequentially.
After the two N-acetylglucos-
amines are added, the assembly
flips from the cytosolic side to the
ER lumen.
Nine mannose and three glucose
molecules are added, totaling 14
sugars.