Study of protein-protein interaction using conformational space annealing.
We apply conformational space annealing (CSA), an efficient global optimization method, to the study of protein-protein interaction. The CSA is incorporated into the Tinker molecular modeling package along with a B-spline method for CAPRI Round 5 experiments. We have used an energy function for the protein-protein interaction that consists of electrostatic interaction, van der Waals interaction, and solvation energy terms represented by the occupancy desolvation method. The parameters of the AMBER94 all-atom empirical force field are used. Each energy term is calculated by precalculated grid potentials and B-spline method approximation. The ligand protein is placed inside a sphere of 50 A radius centered at an appropriate location, and the CSA rigid docking studies are carried out to find stable complexes. Up to 10 complexes are selected using the K-mean clustering method and biological information when available. These complexes are energy-minimized for further refinement by considering the flexibility of interacting proteins. The results show that the CSA method has a potential for the study of protein-protein interaction.
Lee
Kyoungrim
K
School of Computational Sciences, Korea Institute for Advanced Study, Dongdaemun-gu, Seoul, Korea.
Sim
Jaehyun
J
Lee
Jooyoung
J
D000465:Algorithms; D016000:Cluster Analysis; D019295:Computational Biology / Q000379:methods*; D003198:Computer Simulation; D030562:Databases, Protein; D019281:Dimerization; D020407:Internet; D046911:Macromolecular Substances; D008958:Models, Molecular; D015233:Models, Statistical; D008968:Molecular Conformation; D009154:Mutation; D011487:Protein Conformation; D017510:Protein Folding; D025941:Protein Interaction Mapping / Q000379:methods*; D017434:Protein Structure, Tertiary; D040901:Proteomics / Q000379:methods*; D015203:Reproducibility of Results; D012984:Software; D040681:Structural Homology, Protein
D046911:Macromolecular Substances