GIS

GIS applies the GANGSTA+ non-sequential structure alignment algorithm to compare protein three-dimensional structures and detect spatial similarities independent of polypeptide chain order.

Key Features:

• Non-Sequential Structure Alignment: Utilizes the GANGSTA+ algorithm to perform non-sequential alignments that identify structural similarities independent of sequence order.
• Comprehensive Database Analysis: Performed an all-against-all comparison on the ASTRAL40 database (SCOP version 1.75) covering over 10,000 protein domains and approximately 55 million structure alignments.
• Constrained Comparative Analysis: Supports comparisons constrained relative to an externally provided protein structure to identify relevant structural relationships.
• Integration with SCOP Classification: Maps alignment results to the Structural Classification of Proteins (SCOP) scheme to relate structures to SCOP families and classifications.
• Symmetry Analysis: Provides analysis of structural symmetry to examine geometric properties of protein architectures.

Scientific Applications:

• Protein Structure Family Analysis: Aligns structures within the SCOP classification to investigate evolutionary and functional relationships among protein families.
• Novel Fold Detection: Identifies non-sequential structural analogs to detect novel protein folds not apparent from sequence-based methods.
• Symmetry Analysis: Analyzes symmetry in protein structures to inform on geometric properties and potential functional implications.

Methodology:

Employs the GANGSTA+ non-sequential alignment algorithm focusing on three-dimensional configurations rather than linear sequences, uses the ASTRAL40 database (SCOP v1.75) in an all-against-all comparison of >10,000 domains (~55 million alignments), integrates results with the SCOP classification scheme, and supports symmetry analysis.