Chemical and protein shifts in the spectrum of the photoactive yellow protein: a time-dependent density functional theory/molecular mechanics study
Literature Information
Eneritz Muguruza González, Leonardo Guidoni, Carla Molteni
We have studied the light absorption properties of the p-coumaric acid chromophore in the photoactive yellow protein (PYP) with a hybrid time-dependent density functional theory/molecular mechanics (TDDFT/MM) method. To critically assess the performance of TDDFT for this specific system, we first evaluated in vacuo the excited states of several PYP chromophore models. We then calculated the absorption maximum of the phenolate anion of the thiomethyl-p-coumaric acid (TMpCA−) in the protein. Although within the limitations of TDDFT in describing charge-transfer and resonance excited states, we confirm a sizeable red shift in the absorption maximum due to the chemical differences between the free chromophore and that in the protein. The interaction between the chromophore and the protein environment induces a very small spectral shift, in line with experimental evidence. Comparison between the vertical electron detachment energy of the chromophorein vacuo and in the protein reveals that the protein stabilizes the choromophore in the excited states by preventing radical formation.
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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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