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Essential biomolecular functions often involve electron-related events such as chemical reactions and photoluminescence phenomena. Theoretical description of such electronic processes requires the use of quantum mechanics (QM), but the number of atoms that can be handled with QM is usually smaller than the number of atoms present in a single protein. A reasonable strategy is therefore to give priority to a few tens or hundreds of atoms in the system and deal with them quantum mechanically. Lower-priority atoms influence the event occurring in the higher-priority area; therefore, their effect should also be taken into account. Under these circumstances, a reasonable approach is to apply two or more different theoretical methods to differently prioritized subsystems. QM can be combined, for example, with less accurate yet much less demanding molecular mechanics (MM). Our own N-layered integrated molecular orbital and molecular mechanics (ONIOM) method allows for such hybrid calculations, and our group has been applying it to a wide range of biology-related problems. In this paper, we briefly explain the theoretical background and the procedure for the theoretical investigation of biological systems. Subsequently, we provide an overview of some of our recent studies of metalloenzymes and photobiology-related problems.

Recent Progress in the Theoretical Studies of Structure, Function, and Reaction of Biological Molecules