Amino Acids Interactions Web Server

Amino Acids Interactions Web Server computes the residue Interaction Energy Matrix for protein structures to quantify pairwise and net interaction energies among amino acids, side chains, backbones, and protein-DNA interfaces for analysis of protein stability and interactions.

Key Features:

• Residue Interaction Energy Matrix: Calculates pairwise and net interaction energies for residues within a protein or between proteins and DNA to quantify energetic contributions to stability.
• Residue Interaction Energy Calculation (molecular mechanical scoring): Uses a molecular mechanical scoring function to compute interaction energies among amino acid residues and between amino acids and deoxyribonucleotides.
• Protein-DNA Interface Analysis: Identifies residues contributing significantly to protein-DNA interface stability and reports interaction energies for amino acid–deoxyribonucleotide pairs.
• Continuum Solvation Model: Incorporates a continuum solvation model to improve representation of electrostatic interactions in aqueous environments.
• Evolutionary Conservation Estimation: Provides a low-overhead pipeline for estimating evolutionary conservation within protein chains to correlate with energetic data.
• Molecular Mechanical Force Field: Employs a molecular mechanical force field that accounts for the sugar-phosphate backbone and solvent dielectric properties in energy calculations.

Scientific Applications:

• Protein stability analysis: Quantifies energetic contributions of individual residues to the three-dimensional stability of proteins.
• Protein-DNA interaction studies: Characterizes energetics at protein-DNA interfaces and supports analysis of how mutations or modifications affect these interactions.
• Evolutionary and functional correlation: Enables correlation of residue-level energetic profiles with evolutionary conservation to inform functional interpretation.
• Environmental effects on interactions: Assesses the influence of solvent dielectric and sugar-phosphate backbone context on biomolecular interaction energies.

Methodology:

Computes a residue Interaction Energy Matrix using a molecular mechanical scoring function/force field that includes a continuum solvation model and explicit consideration of the sugar-phosphate backbone and solvent dielectric properties; provides a low-overhead pipeline to estimate evolutionary conservation within protein chains.