Ultrafast energy transfer in chlorosomes from the green photosynthetic bacterium Chloroflexus aurantiacus.
Energy transfers between the bacteriochlorophyll c and a antennae in light-harvesting chlorosomes from the green bacterium Chloroflexes aurantiacus have been studied in two-color pump-probe experiments with improved sensitivity and wavelength versatility.  The BChl c --> BChl a energy transfers are well simulated with biexponential kinetics, with lifetimes of 2-3 and 11 ps.  They do not exhibit an appreciable subpicosecond component.  In the context of a kinetic model for chlorosomes, these lifetimes suggest that both internal BChl c processes and the BChl c --> BChl a energy-transfer step contribute materially to the empirical rod-to-baseplate energy-transfer kinetics.
Savikhin
S
S
Ames Laboratory and Department of Chemistry, Iowa State University, Ames 50011, USA.
Zhu
Y
Y
Blankenship
R E
RE
Struve
W S
WS
D001426:Bacterial Proteins / Q000378:metabolism*; D001429:Bacteriochlorophylls / Q000378:metabolism*; D019414:Chlorobi / Q000378:metabolism* / Q000502:physiology / Q000648:ultrastructure; D004735:Energy Transfer; D007700:Kinetics; D045342:Light-Harvesting Protein Complexes; D015388:Organelles / Q000378:metabolism* / Q000502:physiology; D045322:Photosynthetic Reaction Center Complex Proteins; D013057:Spectrum Analysis
D001426:Bacterial Proteins; D001429:Bacteriochlorophylls; D045342:Light-Harvesting Protein Complexes; D045322:Photosynthetic Reaction Center Complex Proteins; C002084:bacteriochlorophyll c