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Femtosecond dynamics of energy transfer in B800-850 light-harvesting complexes of Rhodobacter sphaeroides.

Authors :
Trautman, J K
Shreve, A P
Violette, C A
Frank, H A
Owens, T G
Albrecht, A C
Source :
Proceedings of the National Academy of Sciences of the United States of America; January 1990, Vol. 87 Issue: 1 p215-219, 5p
Publication Year :
1990

Abstract

We report femtosecond transient absorption studies of energy transfer dynamics in the B800-850 light-harvesting complex (LHC) of Rhodobacter sphaeroides 2.4.1. For complexes solubilized in lauryldimethylamine-N-oxide (LDAO), the carotenoid to bacteriochlorophyll (Bchl) B800 and carotenoid to Bchl B850 energy transfer times are 0.34 and 0.20 ps, respectively. The B800 to B850 energy transfer time is 2.5 ps. For complexes treated with lithium dodecyl sulfate (LDS), a carotenoid to B850 energy transfer time of less than or equal to 0.2 ps is seen, and a portion of the total carotenoid population is decoupled from Bchl. In both LDAO-solubilized and LDS-treated complexes an intensity-dependent picosecond decay component of the excited B850 population is ascribed to excitation annihilation within minimal units of the LHC.

Details

Language :
English
ISSN :
00278424 and 10916490
Volume :
87
Issue :
1
Database :
Supplemental Index
Journal :
Proceedings of the National Academy of Sciences of the United States of America
Publication Type :
Periodical
Accession number :
ejs60419384
Full Text :
https://doi.org/10.1073/pnas.87.1.215