pFlexAna

pFlexAna analyzes conformational variations between protein structures independent of sequence homology by identifying, aligning, and clustering structurally analogous core fragments.

Key Features:

• Homology-Independent Analysis: Operates without sequence homology data to detect conformational changes not apparent from sequence comparison.
• Statistical Alignment of Protein Fragments: Employs a statistical test to align core fragments of proteins based on structural similarity.
• Super-Alignment Clustering: Clusters aligned fragment pairs into "super-alignments" by evaluating the geometric transformations required for their alignment.
• Visualization of Conformational Changes: Displays conformational differences, highlighting major shifts between clusters and smaller adjustments within clusters.

Scientific Applications:

• Comparative Structural Analysis: Facilitates comparative studies across diverse protein families by identifying conformational changes without sequence dependency.
• Functional Annotation: Provides insights into protein function by revealing structural flexibility, useful for proteins with unknown or poorly characterized roles.
• Drug Design and Development: Identifies flexible regions in target proteins that can inform design of compounds targeting conformationally relevant sites.

Methodology:

Initial alignment of protein fragments using a statistical test to identify structurally analogous core fragments, followed by clustering of aligned fragment pairs into super-alignments based on the geometric transformations required for their alignment.