N-Glycan Insertion for Probing Protein-Protein Interactions and Epitope Mapping.

Area of Science:

• Biochemistry
• Molecular Biology
• Protein Engineering

Background:

• Site-specific N-linked glycosylation is a valuable technique for protein research.
• Engineered glycans can sterically hinder protein-protein interactions or antibody binding due to their size.

Purpose of the Study:

• To provide protocols for introducing engineered N-linked glycans into recombinant proteins.
• To guide the selection of suitable mutagenesis sites using computational models.
• To facilitate the study of glycan-mediated effects on protein function and interactions.

Main Methods:

• Utilizing AlphaFold models to identify surface-exposed residues for mutagenesis.
• Employing site-directed mutagenesis to insert N-linked glycosylation motifs.
• Expressing and analyzing recombinant N-glycan variant proteins.

Main Results:

• Demonstration of protocols for successful site-specific glycan engineering.
• Identification of suitable residues for mutagenesis using AlphaFold predictions.
• Establishment of methods for producing and characterizing glycan variants.

Conclusions:

• Engineered N-linked glycans serve as powerful tools for probing protein function.
• This methodology enables the investigation of steric effects and binding interactions.
• The provided protocols facilitate the creation and study of modified recombinant proteins.