Simulating antigen–antibody interactions is crucial in understanding the mechanics of antigen–antibody binding in medical science. In this study, molecular dynamics simulations are performed to analyse the dissociation of the P1053-0.5β antibody complex structure. The two-dimensional free energy profiles of the complex structure are extracted using the weighted histogram analysis method, and the binding pathway is then predicted using a modified form of the MaxFlux-PRM method. The simulation results suggest that 10 amino residues (i.e. Leu11, Val13, Asp34, Arg112, Thr101, Gly127, Val229, Ser231, Ile235 and Arg236) play a key role in relaxing the antibody structure, thereby facilitating the binding of the 0.5β antibody-P1053 peptide system.
