Abstract
High spectral tunability and quantum yield are the striking features of rhodopsin photochemistry. They rely on a strong and complex interaction of their chromophore, the protonated Schiff base of retinal, with its protein environment. In this article, we review the progress in the computational modeling of these systems, focusing on the optical properties and the excited state dynamics. While the earlier success of atomistic theoretical models was based on the breakthrough in X-ray crystallography and combined quantum mechanical molecular mechanical (QM/MM) methodology, recent advances point out the importance of high-level QM methods and the incorporation of effects that are neglected in conventional QM/MM or ONIOM schemes, like polarization and charge transfer.
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Notes
Which partially have been included in earlier cluster models.
The basis set limit of the MP2 PAs for the PSB6 model is extrapolated from the results of cc-pVTZ, cc-pVQZ, and cc-pV5Z calculations using the Schwartz formula [29].
Note, that HF besides a systematic overestimation due to the lack of dynamic correlation shows the same length-dependency as the post-HF methods.
Abbreviations
- B3LYP:
-
Becke-3-parameter hybrid exchange and Lee–Yang–Parr correlation functional
- BLA:
-
Bond length alternation
- bR:
-
Bacteriorhodopsin
- CASSCF:
-
Complete active space self consistent field method
- CASPT2:
-
Complete active space method with second order perturbation correction
- CCSD:
-
Coupled cluster singles doubles
- CHARMM:
-
Chemistry at HArvard molecular mechanics
- (TD)DFT:
-
(Time-dependent) density functional theory
- GGA:
-
Generalized gradient approximation
- HBN:
-
Hydrogen bonded network
- HF:
-
Hartree–Fock method
- LDA:
-
Local density approximation
- MP2:
-
Second order Møller–Plesset perturbation theory
- MRCI:
-
Multi-reference configuration interaction
- OM2:
-
Orthogonalization method 2
- PA:
-
Proton affinity
- ppR:
-
Pharaonis phoborhodopsin (also called sensory rhodopsin II)
- PSB:
-
Protonated Schiff base
- QM/MM:
-
Combined quantum mechanical molecular mechanical method
- SCC-DFTB:
-
Self-consistent charge density functional based tight binding method
- SORCI:
-
Spectroscopy oriented configuration interaction
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Wanko, M., Hoffmann, M., Frauenheim, T. et al. Computational photochemistry of retinal proteins. J Comput Aided Mol Des 20, 511–518 (2006). https://doi.org/10.1007/s10822-006-9069-8
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DOI: https://doi.org/10.1007/s10822-006-9069-8