An efficient electrostatic embedding QM/MM method using periodic boundary conditions based on particle-mesh Ewald sums and electrostatic potential fitted charge operators
Résumé
Hybrid quantum mechanics / molecular mechanics (QM/MM) models successfully describe the properties of biological
macromolecules. However, most QM/MM methodologies are constrained to unrealistic gas phase models, thus limiting
their applicability. In the literature, several works have attempted to define a QM/MM model in periodic boundary
conditions (PBC) but frequently the models are too time-consuming for general applicability to biological systems in
solution. Here, we define a simple and efficient electrostatic embedding QM/MM model in PBC combining the benefits
of electrostatic potential fitted (ESPF) atomic charges and particle-mesh Ewald sums, that can efficiently treat systems
of arbitrary size at a reasonable computational cost. To illustrate this, we apply our scheme to extract the lowest singlet
excitation energies from a model for arabidopsis thaliana cryptochrome 1 containing circa 93000 atoms, reproducing
accurately the experimental absorption maximum
Domaines
Chimie
Origine : Fichiers produits par l'(les) auteur(s)