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J. Biochem, 1988, Vol. 103, No. 6 1011-1015
© 1988 Japanese Biochemical Society

research-article

Trimethylamine N-Oxide Respiration by Aerobic Photosynthetic Bacterium, Erythrobacter sp. OCh 1141

Hiroyuki Arata, Faculty of Science, Yasuharu Serikawa, Faculty of Science and Ken-ichiro Takamiya, Faculty of Science

Department of Biology,Kyushu University 33 Higashi-ku, Fukuoka, Fukuoka 812

Erythrobacter sp. OCh 114, an aerobic photosynthetic bacterium, had trimethylamine N-oxide (TMAO) reductase activity, which increased when the culture medium contained TMAO. The reductase was located in the periplasm. The bacteria grew anaerobically in the presence of TMAO. These results suggested that Erythrobacter OCh 114 has the ability to reduce TMAO through the respiratory chain. The TMAO respiration system of this organism was different from those of facultative purple photosynthetic bacteria in two respects: (a) TMAO reductase did not have activity to reduce dimethyl sulfoxide and (b) soluble c-type cytochrome, cytochrome c551, and cytochrome b-c1 complex appeared to be involved. The photochemical activity, which is usually inoperative in the anaerobic cell suspension, was restored by TMAO, suggesting that the photosynthesis and the TMAO respiration share a common electron transfer chain.

1This work was supported in part by a Grant-in-Aid for Cooperative Research (No. 60304007) from the Ministry of Education, Science and Culture of Japan.


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