CNAnalysis

CNAnalysis performs rigidity theory–based thermal unfolding simulations of proteins to link structural characteristics with biological function by integrating temperature-dependent hydrophobic interactions.

Key Features:

• Temperature-Dependent Modeling: Incorporates temperature-dependent effects on hydrophobic tethers into thermal unfolding simulations.
• Global and Local Indices: Computes global and local stability indices that quantify biomacromolecular rigidity and identify phase transition points where proteins shift from rigid to floppy states.
• Identification of Structural Weak Spots: Identifies structural weak spots or unfolding nuclei within protein structures for targeted stability analysis.
• Flexibility and Function Correlation: Provides local indices to evaluate flexibility–function relationships and assess the impact of ligand binding on protein dynamics.
• Ensemble-Based Simulations: Implements two ensemble-based variants of thermal unfolding simulations to address sensitivity to input structures.
• Output Options: Exports results as raw data, graphical plots, and Jmol representations.

Scientific Applications:

• Protein Stability Analysis: Determines phase transition points and structural weak spots to assess (thermo-)stability of proteins.
• Protein Engineering: Supports data-driven protein engineering by pinpointing unfolding nuclei for targeted modifications to enhance stability or function.
• Structural Biology and Molecular Dynamics: Facilitates investigation of flexibility–function relationships and ligand-binding effects relevant to structural biology and molecular dynamics studies.
• Drug Discovery: Aids in elucidating how ligand binding influences protein activity, informing drug discovery and development.

Methodology:

Uses rigidity theory–based thermal unfolding simulations integrating temperature-dependent hydrophobic interactions, computes global and local indices, and provides two ensemble-based simulation variants.