Zebra3D

Zebra3D analyzes subfamily-specific regions (SSRs) within three-dimensional protein structures to identify local structural determinants of functional diversity and conformational plasticity in protein superfamilies.

Key Features:

• 3D-Alignment Analysis: Applies machine learning to systematically analyze 3D-alignments of homologous proteins and detect patterns of local 3D structures such as single residues, loops, or secondary structure fragments.
• Identification of Subfamily-Specific Regions (SSRs): Identifies SSRs that vary spatially among subfamilies while remaining equivalent within them.
• Subfamily Classification: Classifies proteins into subfamilies based on detected local 3D structural variations.
• Statistical Prioritization: Implements statistical methods to prioritize functionally significant 3D variability and distinguish meaningful structural divergences from random fluctuations.
• Integration with Mustguseal: Integrates with the Mustguseal web-server to automate construction of 3D-alignments of functionally diverse proteins from a single PDB code.

Scientific Applications:

• Catalytic Activity and Ligand Binding: Analyzes 3D determinants of catalytic activity and ligand accommodation to inform studies of enzymatic function.
• Directed Evolution and Chimeric Enzymes: Supports preparation of focused libraries for directed evolution and informs exchange of equivalent regions between homologs for chimeric enzyme design.
• Binding Site Characterization: Characterizes plasticity in binding sites to assess variability in protein–ligand interactions.
• Structural Biology, Enzymology, and Drug Discovery: Provides structural insights applicable to protein design and drug discovery efforts.

Methodology:

Machine learning analysis of 3D-alignments to identify SSRs (single residues, loops, secondary structure fragments), classification of proteins into subfamilies, and statistical methods to prioritize functionally significant 3D variability; integration with Mustguseal for automated 3D-alignment construction from a PDB code.