Glycosylator

Glycosylator models and refines glycans in protein structures to support identification and analysis of N-linked glycosylation and complex multi-branching carbohydrate conformations.

Key Features:

• Glycan modeling: Models glycans within protein structures ranging from monosaccharides to complex multi-branching glycan structures.
• N-linked glycosylation support: Represents glycosylation at asparagine residues and across sequons for analysis of N-linked glycosylation.
• Genetic algorithm refinement: Applies a genetic algorithm to refine modeled glycans, remove steric clashes, and explore alternative conformations.
• Template-based identification: Identifies specific three-dimensional glycans on protein structures using a library of predefined templates.
• Extensible polymer library: Provides a generic library design that allows incorporation of additional polymer types.
• CHARMM topology basis: Uses the CHARMM force field as the molecular topology basis to enable generation of new complex sugar moieties without internal code changes.
• Implementation: Implemented as a Python framework.

Scientific Applications:

• Glycan identification in structures: Identification and modeling of glycans in protein structural models.
• N-linked glycosylation analysis: Analysis of glycosylation at asparagine residues and across sequons.
• Structural refinement: Refinement of glycan conformations to resolve steric clashes for structural and functional studies.
• Generation of novel sugar moieties: Generation and parametrization of new complex sugar moieties using CHARMM-based topologies.
• Glycoinformatics and biomolecular modeling: Support for research workflows in glycoinformatics and biomolecular modeling.

Methodology:

Implemented in Python, Glycosylator uses a library of predefined glycan templates and the CHARMM force field as its molecular topology basis and applies a genetic algorithm to refine modeled glycans and remove steric clashes; its generic library structure permits adding polymer types and generating new complex sugar moieties without changing internal code.