Sep 20 2021
| Tutorial |
This method computes the change in binding free energy of a protein complex upon mutation of a single residue.
Getting Started A PDB structure or ICM object containing the protein complex is needed. A graphical selection of the residue to be mutated is then made, the mutant amino acid (e.g., "ala" or "all" for calculation of the energy for all natural amino acids) is then selected. The energy is computed as interaction energy between two parts (each part may contain more than one protein chain). One part has to be specified, e.g., "a" or "a,b".
CalculationThe binding free energy change, ..Gbind, is computed as a difference between the free energy of mutant and wild type:
where Ecomp represents the energy of the complex, and Eparts represents the sum of the energies, internal or solvation, for each part. The energy is calculated for fixed backbone and all the side chains except those in the vicinity of the mutatable residue. Monte Carlo simulations are carried out to relieve possible atomic clashes created as a result of mutations to larger amino acid residues. "Scan Protein Interface" option allows to mutate all residues (one by one) of the Interacting Part in close contact with the second part of the complex.
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