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Calculating absorption shifts for retinal proteins: computational challenges.

M Wanko1, M Hoffmann, P Strodel

  • 1Department of Theoretical Physics, University of Paderborn, D-33098 Paderborn, Germany.

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
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Computational methods accurately model rhodopsin spectral tuning by considering retinal chromophore interactions with protein environments. This study proposes an improved procedure for calculating absorption energies in bacteriorhodopsin.

Area of Science:

  • Computational chemistry
  • Biophysics
  • Spectroscopy

Background:

  • Rhodopsins modulate chromophore optical properties via protein-environment interactions.
  • Retinal chromophore spectral tuning depends on its response to stress, protein environment, and electronic properties.

Purpose of the Study:

  • Investigate computational approaches for modeling absorption energy changes due to geometry and electric fields.
  • Assess the accuracy of various computational methods for predicting spectral tuning in rhodopsins.

Main Methods:

  • Geometry optimization using DFT methods.
  • Excitation energy calculations using semiempirical or ab initio multireference configuration interaction.
  • Combined quantum mechanical/molecular mechanical (QM/MM) simulations with point charge models.

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Main Results:

  • Absorption energies are highly sensitive to the ground-state geometry of retinal.
  • Previous methods like TDDFT, CASSCF, and CIS poorly represent the response to external fields.
  • A proposed procedure combining DFT optimization and multireference CI yields accurate absorption energies for bacteriorhodopsin.

Conclusions:

  • Accurate modeling of rhodopsin spectral tuning requires careful consideration of computational methods for geometry and excited states.
  • The proposed QM/MM approach provides a reliable method for calculating bR absorption energies, approaching experimental values.