Orientations between Red Antenna States of Photosystem I Monomers from Thermosynechococcus elongatus Revealed by Single-Molecule Spectroscopy.
J Phys Chem B
; 119(43): 13888-96, 2015 Oct 29.
Article
em En
| MEDLINE
| ID: mdl-26226187
ABSTRACT
Single-molecule spectroscopy at low temperature was used to study the spectral properties, heterogeneities, and spectral dynamics of the chlorophyll a (Chl a) molecules responsible for the fluorescence emission of photosystem I monomers (PS I-M) from the cyanobacterium Thermosynechococcus elongatus. The fluorescence spectra of single PS I-M are dominated by several red-shifted chlorophyll a molecules named C708 and C719. The emission spectra show broad spectral distributions and several zero-phonon lines (ZPLs). Compared with the spectra of the single PS I trimers, some contributions are missing due to the lower number of C719 Chl's in monomers. Polarization-dependent measurements show an almost perpendicular orientation between the emitters corresponding to C708 and C719. These contributions can be assigned to chlorophyll dimers B18B19, B31B32, and B32B33.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Complexo de Proteína do Fotossistema I
/
Synechococcus
Idioma:
En
Revista:
J Phys Chem B
Ano de publicação:
2015
Tipo de documento:
Article