Elucidating the role of structural fluctuations, and intermolecular and vibronic interactions in the spectroscopic response of a bacteriophytochrome
Literature Information
Veronica Macaluso, Lorenzo Cupellini, Giacomo Salvadori, Filippo Lipparini, Benedetta Mennucci
We present the first comprehensive multiscale computational investigation of Resonance Raman, absorption and Circular Dichroism spectra of the resting state of the Deinococcus radiodurans phytochrome. The spectra are simulated in all their components, namely the energy position and the lineshapes of both the far-red and the blue bands. To achieve such a goal, we have combined a 4.5 μs MD simulation of the solvated dimeric phytochrome with a hybrid quantum mechanics/molecular mechanics (QM/MM) model, which accounts for both electrostatic and mutual polarization effects between the QM and the MM subsystems. A good agreement with experiments is found for all the three spectra. Moreover, we find a transient H-bond network within the binding pocket of the biliverdin chromophore that, unexpectedly, does not significantly affect the spectra. In parallel, we characterize the vibrations that are more strongly coupled to the biliverdin excitation, confirming the important role of the hydrogen-out-of-plane mode of its vinyl C–H together with the expected CC stretching of the double bond involved in the photoisomerization.
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Source Journal
Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.











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