ARIP: A Tool for Precise Interatomic Contact Area and Volume Calculation in Proteins.

Area of Science:

• Structural biology
• Computational biology
• Biophysics

Background:

• Protein structure and flexibility are determined by amino acid residue interactions.
• These interactions are crucial for protein function and molecular binding.
• Accurate identification of residue contacts is essential for understanding these processes.

Purpose of the Study:

• Introduce ARIP, a novel computational tool for identifying protein contact residues.
• Develop a method to directly calculate atomic contact volume for more informative interaction analysis.
• Provide a tool suitable for various applications including molecular dynamics.

Main Methods:

• ARIP utilizes a modified dr_sasa algorithm and an atomic overlap weighted algorithm.
• Calculates contact area and volume based on van der Waals radii and user-defined solvent radii.
• Parameters derived from analysis of ~5000 X-ray crystallography structures.
• Capable of analyzing multiple models within a single PDB file.

Main Results:

• ARIP directly calculates atomic contact volume, offering more informative insights than contact area.
• Contact volume is symmetrically distributed between interacting atoms.
• Demonstrated utility in analyzing NMR structures, protein-drug binding, protein-DNA binding, and molecular dynamics simulations.

Conclusions:

• ARIP provides a robust method for identifying protein contact residues and analyzing molecular interactions.
• The contact volume metric enhances the understanding of intra- and intermolecular interactions.
• ARIP is a valuable tool for structural biology, drug discovery, and molecular dynamics research.