Photosynthetic activity and components of the electron transport chain in the aerobic bacteriochlorophyll a-containing bacterium Roseinatronobacter thiooxidans |
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Authors: | I. N. Stadnichuk M. F. Yanyushin V. A. Boychenko E. P. Lukashev E. N. Boldareva A. A. Solovyev V. M. Gorlenko |
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Affiliation: | (1) Bach Institute of Biochemistry, Russian Academy of Sciences, Moscow, Russia;(2) Institute of Basic Biological Problems, Russian Academy of Sciences, ul. Institutskaya 2, Pushchino, Moscow oblast, 142290, Russia;(3) Biological Faculty, Moscow State University, Moscow, 119991, Russia;(4) Winogradsky Institute of Microbiology, Russian Academy of Sciences, pr. 60-letiya Oktyabrya 7/2, Moscow, 117312, Russia |
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Abstract: | Bioenergetics of the aerobic bacteriochlorophyll a-containing (BCl a) bacterium (ABC bacterium) Roseinatronobacter thiooxidans is a combination of photosynthesis, oxygen respiration, and oxidation of sulfur compounds under alkaliphilic conditions. The photosynthetic activity of Rna. thiooxidans cells was established by the photoinhibition of cell respiration and reversible photobleaching discoloration of the BCl a of reaction centers (RC), connected by the chain of electron transfer with cytochrome c 551 oxidation. The species under study, like many purple bacteria and some of the known ABC bacteria, possesses a light-harvesting pigment-protein (LHI) complex with the average number of 30 molecules of antenna BCl a per one photosynthetic RC. Under microaerobic growth conditions, the cells contained bc 1 complex and two terminal oxidases: cbb 3-cytochrome oxidase and the alternative cytochrome oxidase of the a 3 type. Besides, Rna. thiooxidans was shown to have several different soluble low- and high-potential cytochromes c, probably associated with the ability of utilizing sulfur compounds as additional electron donors. |
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Keywords: | aerobic bacteriochlorophyll a-containing bacteria Roseinatronobacter thiooxidans photosynthesis cytochromes |
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