2024-03-29T14:04:02Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00028100
2023-01-16T04:20:27Z
336:695:696
Theoretical Model of Exciton States and Ultrafast Energy Transfer in Heliobacterial Type I Homodimeric Reaction Center
Kimura, Akihiro
91509
Itoh, Shigeru
91510
A simple theoretical model of exciton dynamics was proposed to interpret the fast excitation energy-transfer process in the type I homodimeric reaction center of Heliobacterium modesticaldum (hRC); this structure was recently identified and shown to resemble that of the plant/cyanobacterial photosystem I (PSI) reaction center. The exciton state model, which mainly relies on the geometries of 54 bacteriochlorophyll (BChl) g, 4 BChl-g′, and 2 chlorophyll (Chl) a on hRC and assumes constant site energy values for the pigments, reproduced the absorption spectrum of hRC rather well. The model also enabled numerical analysis of the exciton dynamics on hRC, which can be compared with the decay-associated spectra obtained by the laser spectroscopy experiments. The model indicates that the stronger transition–dipole moment on BChl-g contributes to the faster energy transfer due to the higher coherency of the delocalized exciton states on hRC compared to that on PSI that arranges Chl-a at almost homologous locations.
ファイル公開:2019-12-20
journal article
ACS Publications
2018-12-20
application/pdf
The Journal of Physical Chemistry B
50
122
11852
11859
1520-6106
https://nagoya.repo.nii.ac.jp/record/28100/files/hRC17.pdf
eng
https://doi.org/10.1021/acs.jpcb.8b08014
“This document is the Accepted Manuscript version of a Published Work that appeared in final form in [The Journal of Physical Chemistry B], copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [https://pubs.acs.org/articlesonrequest/AOR-rghniuvDJDnjVFhGMIWm].”