Electronic Interactions in the Bacterial Reaction Center Revealed by Two-Color 2D Electronic Spectroscopy.
J Phys Chem Lett
; 9(18): 5219-5225, 2018 Sep 20.
Article
em En
| MEDLINE
| ID: mdl-30136848
ABSTRACT
The bacterial reaction center (BRC) serves as an important model system for understanding the charge separation processes in photosynthesis. Knowledge of the electronic structure of the BRC is critical for understanding its charge separation mechanism. While it is well-accepted that the "special pair" pigments are strongly coupled, the degree of coupling among other BRC pigments has been thought to be relatively weak. Here we study the W(M250)V mutant BRC by two-color two-dimensional electronic spectroscopy to correlate changes in the Q x region with excitation of the Q y transitions. The resulting Q y-Q x cross-peaks provide a sensitive measure of the electronic interactions throughout the BRC pigment network and complement one-color 2D studies in which such interactions are often obscured by energy transfer and excited-state absorption signals. Our observations should motivate the refinement of electronic structure models of the BRC to facilitate improved understanding of the charge separation mechanism.
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Base de dados:
MEDLINE
Assunto principal:
Bactérias
/
Proteínas de Bactérias
/
Complexo de Proteínas do Centro de Reação Fotossintética
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article