... An approach to the hybrid quantum mechanical and molecular mechanical (QM/MM) theory based on the effective fragment potential (EFP) technique (M. Gordon and co-authors) for modeling properties and reactivity of large molecular systems of biochemical significance is being developed. Currently we are preparing a novel version of the computer program based on the most recent variant of the PC GAMESS quantum chemistry package (A. A. Granovsky) and the TINKER molecular modeling package (J. Ponder). ...