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Energy transfer processes in Rhodopseudomonas palustris grown under low‐light conditions
Author(s) -
Nishimura Yoshinobu,
Shimada Keizo,
Yamazaki Iwao,
Mimuro Mamoru
Publication year - 1993
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(93)80245-p
Subject(s) - rhodopseudomonas palustris , energy flow , fluorescence , photochemistry , wavelength , chemistry , analytical chemistry (journal) , energy transfer , excitation , spectral line , spectroscopy , purple bacteria , emission spectrum , photosynthesis , rhodospirillaceae , bacteria , chemical physics , materials science , energy (signal processing) , optics , physics , optoelectronics , electron transfer , biology , photosynthetic reaction centre , chromatography , biochemistry , genetics , quantum mechanics , astronomy
Excitation energy flow in the purple photosynthetic bacterium Rhodopseudomonas palustris grown under a low‐light intensity was studied by time‐resolved fluorescence spectroscopy in the ps time range. This bacterium synthesized the B824 component under this light condition. Time‐resolved spectra at 20°C indicated the sequential energy flow in the order of B803, B856, B882 and B900, long wavelength antenna. An emission from B803 was not observed. A remarkable feature was the emission from B824 throughout the measuring time. After the excitation pulse of 100 ps, the spectra did not change any further, indicating the establishment of an equilibrium among components. Based on the energy distribution after equilibrium, parallel energy transfer pathways to LH 1 were suggested; one including B824 integrated in the B803‐824‐856 complex, and the other, from the B803‐856 complex to B882. The latter was the dominant energy flow pathway in this bacterium.