Abstract
A water-soluble bacteriochlorophyll-protein and a complex which also contained photochemically-active reaction centers were isolated from Chlorobium thiosulfatophilum. The procedures were similar to those used previously on Chloropseudomonas ethylica (Fowler, C. F., Nugent, N. A. and Fuller, R. C. (1971) Proc. Natl. Acad. Sci. U.S. 68, 2278–2282), and the corresponding complexes from the two organisms exhibit marked similarities. They are characterized in terms of their absorption spectra at 100 and 300 °K, circular dichroism spectra at 300 °K, and, in the case of the reaction center complexes, by the light- or oxidation-induced changes in the absorption and circular dichroism spectra. On the basis of exciton interactions observed in the circular dichroism and low-temperature absorption spectra, we conclude that the predominant pigment arrangement in the bacteriochlorophyll-reaction center complex is distinctly different from that in the bacteriochlorophyll-protein.
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Schedule a callMore From: Biochimica et Biophysica Acta (BBA) - Bioenergetics
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