title: Flexible effective fragment QM/MM method: validation through the challenging tests.
abstract: A new version of the QM/MM method, which is based on the effective fragment potential (EFP) methodology [Gordon, M. et al., J Phys Chem A 2001, 105, 293] but allows flexible fragments, is verified through calculations of model molecular systems suggested by different authors as challenging tests for QM/MM approaches. For each example, the results of QM/MM calculations for a partitioned system are compared to the results of an all-electron ab initio quantum chemical study of the entire system. In each case we were able to achieve approximately similar or better accuracy of the QM/MM results compared to those described in original publications. In all calculations we kept the same set of parameters of our QM/MM scheme. A new test example is considered when calculating the potential of internal rotation in the histidine dipeptide around the C(alpha)bond;C(beta) side chain bond.
authors.affiliation: Chemistry Department, M.V. Lomonosov Moscow State University, Moscow 119899, Russian Federation.
authors.forename: A V
authors.initials: AV
authors.lastname: Nemukhin
authors.forename: B L
authors.initials: BL
authors.lastname: Grigorenko
authors.forename: I A
authors.initials: IA
authors.lastname: Topol
authors.forename: S K
authors.initials: SK
authors.lastname: Burt