Golgi mannosidase 25.2 Oligosaccharides are added to proteins in the er and Golgi ↓ N-acetyl- glucosamine transfe rase Figure 25.5 Processing for a complex oligosaccharide occurs in the Golgi and trims the original preformed unit to the ↓ Golgi manno sida se‖ inner core consisting of 2 N-acetyl glucosamine and 3 mannose residues HC H resistance Then further sugars can be added, in the order in which the transfer enzymes are Golgi enzymes add further encountered to generate a terminal residues Galsialic acid region containing N-acetyl-glucosamine HC-CH galactose, and sialic acid winner core Terminal region 消当Figure 25.5 Processing for a complex oligosaccharide occurs in the Golgi and trims the original preformed unit to the inner core consisting of 2 N-acetyl￾glucosamine and 3 mannose residues. Then further sugars can be added, in the order in which the transfer enzymes are encountered, to generate a terminal region containing N-acetyl-glucosamine, galactose, and sialic acid. 25.2 Oligosaccharides are added to proteins in the ER and Golgi