charge

charge computes net charge profiles of proteins across pH and generates protein charge plots to characterize electrostatic properties and the ionization state of amino acid residues.

Key Features:

• EMBOSS integration: Implemented within the EMBOSS suite and interoperates with other EMBOSS tools and libraries.
• pH-dependent charge calculation: Calculates net charge of amino acids at user-specified pH values to produce charge profiles and plots.
• Ionizable group consideration: Considers ionizable side chains and terminal groups within the protein when computing charge.
• Extensible C libraries: Leverages the EMBOSS C programming libraries for computational implementation and extensibility.
• ACD-based customization: Supports customization via ACD (Application Configuration Description) files to modify tool parameters without rewriting code.

Scientific Applications:

• Protein charge distribution analysis: Visualizes charge distribution across a protein sequence or structure as a function of pH.
• Electrostatics and stability: Informs studies of electrostatic contributions to protein stability and conformational behavior.
• Functional interaction studies: Supports investigation of enzyme activity, ligand binding, and protein-protein interactions by revealing charge-related determinants.

Methodology:

Calculates the net charge of amino acids at different pH levels and produces a plot reflecting the protein's charge profile, explicitly considering ionizable groups within the protein.