Nov 25, 1997

Electron transfer towards the RCI-type photosystem in the green sulphur bacterium Chlorobium limicola forma thiosulphatophilum studied by time-resolved optical spectroscopy in vivo

European Journal of Biochemistry
D AlbouyW Nitschke

Abstract

Flash-induced spectral changes in the wavelength region of the alpha-peaks of heme proteins and in the time domain from microseconds to seconds have been recorded on whole cells of the green sulphur bacterium Chlorobium limicola forma thiosulfatophilum. Extensive flash-excitation by trains of flashes resulted in oxidation of 7-8 c-type heme molecules/photosynthetic reaction centre. The complement of heme species was found to be spectrally heterogeneous allowing the study of electron transfer events induced by an isolated single-turnover flash. Under single-flash conditions, a c553 heme was seen to become oxidised with tau = 30 micros, concommitant with the reduction of the primary donor of the reaction centre. Subsequently, the alpha-peak of the photooxidised heme broadened and shifted towards longer wavelengths (tau = 70 micros) indicating equilibration of the positive charge over two differing heme species. In the time domain t > 1 ms, rereduction of c-type hemes was seen to be paralleled by a blue shift and further broadening of the alpha-peak. Concommitantly, b-type hemes were observed to first become reduced (within a few milliseconds), then over-oxidised (t > 200 ms) and eventually rereduced to their redox state prior to ...Continue Reading

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Mentioned in this Paper

Photopsia
Chlorobiaceae
Electron Transport
Sulfur
Rad51B-Rad51C Complex
Cytochrome c Group
Chlorobium limicola
Oxidation
Cytochromes
Hemeproteins

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