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Photodynamics of Microbial Rhodopsin Mimic M1-L121E: Insights from Computational Modeling.

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Area of Science:

  • Biochemistry and Biophysics
  • Photochemistry
  • Molecular Dynamics

Background:

  • Rhodopsin's photodynamics are key to understanding light-driven biological processes.
  • Microbial rhodopsin mimics serve as models for studying these complex mechanisms.

Purpose of the Study:

  • Investigate the excited-state properties and isomerization dynamics of a microbial rhodopsin mimic.
  • Elucidate the distinct isomerization pathways of all-trans (AT) and 13-cis (13C) conformations.

Main Methods:

  • Computational scanning of the C13═C14 dihedral angle.
  • Analysis of energy levels, electronic state mixing, and excited-state lifetimes.
  • Characterization of chromophore-protein interactions across different conformations.

Main Results:

  • Distinct isomerization pathways were identified for AT and 13C conformations.
  • In the AT conformation, S1 and S2 energy level crossing led to state mixing, slowing isomerization and prolonging excited-state lifetime.
  • Chromophore-protein interactions were attractive in 13C but repulsive near mutation sites in AT conformations.

Conclusions:

  • Repulsive forces in the AT conformation may impact ground-state stability, indirectly influencing excited-state isomerization.
  • Understanding these conformational dynamics is vital for rhodopsin function.
  • This research provides insights into the photophysical mechanisms of rhodopsin-like proteins.