The N-linked glycans on transferrin and α1-antitrypsin from patients with congenital disorders of glycosylation type I have increased fucosylation and branching relative to normal controls. The elevated levels of monofucosylated biantennary glycans are probably due to increased α-(1 → 6) fucosylation. The presence of bi- and trifucosylated triantennary and tetra-antennary glycans indicated that peripheral α-(1 → 3), as well as core α-(1 → 6), fucosylation is increased. Altered processing was observed on both the fully and underglycosylated glycoforms.
Abbreviations used: CDG, congenital disorders of glycosylation; MALDI–TOF-MS, matrix-assisted laser-desorption ionization–time-of-flight mass spectrometry; NeuAc, N-acetylneuraminic acid; PNGase F, peptide N-glycosidase F.
- The Biochemical Society, London ©2001