Glycan fragment database: a database of PDB-based glycan 3D structures

Area of Science:

• Structural Biology
• Glycobiology
• Bioinformatics

Background:

• Glycans, or oligosaccharide chains in glycoproteins, are characterized by torsion angles of glycosidic linkages.
• Understanding accessible glycan conformations is crucial for elucidating their biological functions.

Purpose of the Study:

• To introduce the Glycan Fragment Database (GFDB) as a resource for glycosidic torsion angles.
• To provide tools for searching and analyzing glycan structures and their conformational distributions.

Main Methods:

• Data derived from glycan structures in the Protein Data Bank (PDB).
• Development of an intuitive glycan sequence search tool.
• Analysis of glycosidic torsion angle distributions for exact and fragment matches.
• Clustering analysis of torsion angle distributions to identify representative structures.

Main Results:

• The GFDB provides distributions of glycosidic torsion angles for searched glycan structures.
• Search results include exact matches (identical sequences) and fragment matches (substructures).
• Fragment matches incorporate influences from adjacent carbohydrate residues.

Conclusions:

• The GFDB facilitates the study of glycan conformations and their biological relevance.
• The database and its search tools enable detailed analysis of glycan structures and their variations.