QM/MM Investigation of the Spectroscopic Properties of the Fluorophore of Bacterial Luciferase
Germano Giuliani, Federico Melaccio, Samer Gozem, Andrea Cappelli, Massimo Olivucci
Abstract
multiconfigurational quantum mechanics/molecular mechanics (QM/MM) approach to model the absorption and fluorescence properties of bacterial luciferin-luciferase. Specifically, we employ complete active space perturbation theory (CASPT2) and study the effect of active space, basis set, and IPEA shift on the computed energies. We discuss the effect of the protein environment on the fluorophore's excited-state potential energy surface and the role that the protein plays in enhancing the fluorescence quantum yield in bacterial bioluminescence.
Topics & Concepts
FluorophoreMolecular mechanicsQM/MMLuciferaseAb initioChemistryQuantum yieldFluorescenceBioluminescenceMolecular dynamicsExcited stateChemical physicsMolecular physicsPhysicsBiophysicsComputational chemistryQuantum mechanicsBiologyBiochemistryTransfectionGenebioluminescence and chemiluminescence researchPhotoreceptor and optogenetics researchAdvanced Fluorescence Microscopy Techniques