| name | glycoengineering |
| description | Analyze and engineer protein glycosylation. Scan sequences for N-glycosylation sequons (N-X-S/T), predict O-glycosylation hotspots, and access curated glycoengineering tools (NetOGlyc, GlycoShield, GlycoWorkbench). For glycoprotein engineering, therapeutic antibody optimization, and vaccine design. |
| license | Unknown |
| tags | ["scientific-skills","glycoengineering","experimental-design","performance"] |
| metadata | {"skill-author":"Kuan-lin Huang"} |
|----------|-------|
| Enhance ADCC | Defucosylation at Fc Asn297 | Afucosylated IgG1 has ~50× better FcγRIIIa binding |
| Reduce immunogenicity | Remove non-human glycans | Eliminate α-Gal, NGNA epitopes |
| Improve PK half-life | Sialylation | Sialylated glycans extend half-life |
| Reduce inflammation | Hypersialylation | IVIG anti-inflammatory mechanism |
| Create glycan shield | Add N-glycosites to surface | Masks vulnerable epitopes (vaccine design) |
Common Mutations Used
| Mutation | Effect |
|---|
| N297A/Q (IgG1) | Removes Fc glycosylation (aglycosyl) |
| N297D (IgG1) | Removes Fc glycosylation |
| S298A/E333A/K334A | Increases FcγRIIIa binding |
| F243L (IgG1) | Increases defucosylation |
| T299A | Removes Fc glycosylation |
Glycan Notation
IUPAC Condensed Notation (Monosaccharide abbreviations)
| Symbol | Full Name | Type |
|---|
| Glc | Glucose | Hexose |
| GlcNAc | N-Acetylglucosamine | HexNAc |
| Man | Mannose | Hexose |
| Gal | Galactose | Hexose |
| Fuc | Fucose | Deoxyhexose |
| Neu5Ac | N-Acetylneuraminic acid (Sialic acid) | Sialic acid |
| GalNAc | N-Acetylgalactosamine | HexNAc |
Complex N-Glycan Structure
Typical complex biantennary N-glycan:
Neu5Ac-Gal-GlcNAc-Man\
Man-GlcNAc-GlcNAc-[Asn]
Neu5Ac-Gal-GlcNAc-Man/
(±Core Fuc at innermost GlcNAc)
Best Practices
- Start with NetNGlyc/NetOGlyc for computational prediction before experimental validation
- Verify with mass spectrometry: Glycoproteomics (Byonic, Mascot) for site-specific glycan profiling
- Consider site context: Not all predicted sequons are actually glycosylated (accessibility, cell type, protein conformation)
- For antibodies: Fc N297 glycan is critical — always characterize this site first
- Use GlyConnect to check if your protein of interest has experimentally verified glycosylation data
Additional Resources
