iPBAvizu

iPBAvizu performs 3D protein structure superimposition using the iPBA (iProtein Blocks Alignment) methodology to compare protein structures and analyze structural conservation and functional specificity.

Key Features:

• Structural Alphabet (Protein Blocks): Represents local protein conformations with 16 Protein Blocks prototypes defined by pentapeptide backbone dihedral angles to capture structural features beyond sequence alignment.
• Advanced Alignment Procedure: Aligns PB-encoded representations using dynamic programming and a dedicated PB substitution matrix with a two-step search strategy that first identifies highly similar regions with high weights and then completes the alignment with relaxed parameters.
• Benchmark Performance: iPBA has demonstrated superior performance in benchmark comparisons with other available structure comparison tools.
• PyMOL Integration: Implements the iPBA alignment and structural superimposition as a PyMOL plugin and provides generation of iPBA alignments and assessment of alignment quality within PyMOL.

Scientific Applications:

• Comparative Structural Biology: Compares 3D protein structures to identify conserved and divergent structural regions.
• Evolutionary Studies: Supports analyses of protein evolution by mapping structural conservation and variation.
• Functional Analysis of Proteins: Aids identification of structure-based functional specificities and regions potentially underlying different biological activities.

Methodology:

Describes proteins with the Protein Blocks structural alphabet (16 prototypes defined by pentapeptide dihedral angles) and performs PB-based alignments using a PB substitution matrix and dynamic programming in a two-step search to produce iPBA alignments and structural superimpositions.