Picosecond dynamics of excitations in light-harvesting complex B800-850 from Chromatium minutissimum studied using fluorescence spectrochronography

The picosecond dynamics of excitations in the isolated B800-850 light-harvesting complex of the purple sulfur bacterium Chromatium minutissimum has been studied using picosecond fluorescence spectrochronography. A short-lived component of about 20 ps lifetime has been found at 77K at the short wavel...

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Bibliographic Details
Published in:FEBS letters 1993-07, Vol.327 (1), p.68-70
Main Authors: Godik, Valentina, Timpmann, Kou, Freiberg, Arvi, Moskalenko, Andrey A.
Format: Article
Language:English
Subjects:
Absorption
B800-850 complex
bacteriochlorophyll
BChl
Chromatium - chemistry
Chromatium - growth & development
Chromatium minutissimum
Excitations dynamics
Light
Light-Harvesting Protein Complexes
Photosynthetic Reaction Center Complex Proteins - chemistry
Picosecond fluorescence
Protein relaxation
reaction center
Spectrometry, Fluorescence
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Summary:The picosecond dynamics of excitations in the isolated B800-850 light-harvesting complex of the purple sulfur bacterium Chromatium minutissimum has been studied using picosecond fluorescence spectrochronography. A short-lived component of about 20 ps lifetime has been found at 77K at the short wavelength part of the B850 fluorescence spectrum similar to that previously described for the core antenna bacteriochlorophyll band B880 of Rhodospirillum rubrum. Evidence has been presented indicating that this component is likely to reflect excitation energy relaxation step(s) involving both photoexcited bacteriochlorophyll and the protein environment. A new kinetic scheme of excitation transfer from the peripheral antenna to the photoreceptor units in purple bacteria is suggested which takes into account these findings.
ISSN:0014-5793
1873-3468
DOI:10.1016/0014-5793(93)81041-W