Protein Dipole Server

Protein Dipole Server calculates and visualizes electrostatic properties of three-dimensional protein structures, reporting net charge, dipole moment, and mean radius to inform analyses of charge distribution and molecular interactions.

Key Features:

• Net Charge Calculation: Computes the overall electrical charge of a protein structure.
• Dipole Moment Analysis: Calculates the dipole moment and provides the dipole vector representing charge distribution within the protein.
• Mean Radius Determination: Determines the mean radius to quantify the spatial dimensions of the protein structure.
• Chain-level Analysis: Analyzes entire proteins and individual peptide chains with a minimum length of 50 residues.
• PDB Input Support: Operates on three-dimensional structures obtained from databases such as PDB.
• Visualization: Superimposes the dipole vector onto a ribbon representation of the protein's backbone for visual interpretation.

Scientific Applications:

• Structural Analysis: Provides electrostatic property data to complement geometric structural analysis.
• Functional Insights: Identifies proteins with extreme positive charges or dipole moments that often interact with ribosomes or nucleic acids, indicating potential functional links.
• Population-scale Analysis: Enables analysis of large datasets; an examination of approximately 12,000 non-homologous PDB biological units showed most proteins fall within a narrow range of net charge and dipole moment but with notable outliers.

Methodology:

Employs computational algorithms to analyze three-dimensional structures obtained from databases such as PDB, examines entire proteins and individual peptide chains with a minimum length of 50 residues, and visualizes properties by superimposing the dipole vector onto a ribbon representation of the protein backbone.