Keywords: الکترواستاتیک پروتئین; PDB; protein data bank; CI2; chymotrypsin inhibitor 2; FKPB; FK506 binding protein; rmsd; root mean square deviation; NOE; nuclear Overhauser enhancement; PB; Poisson-Boltzmann; Hydrogen exchange; NMR; Continuum dielectric; Protein electrostatics; Struc