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Plant and Cell Physiology, 1995, Vol. 36, No. 5 819-823
© 1995

Identification and Subcellular Distribution of Carotenoids in the Aerobic Photosynthetic Bacterium, Pseudomonas radiora Strain MD-1

Satoshi Saitoh1, Shinichi Takaichi2, Keizo Shimada3 and Yukimasa Nishimura1

1Department of Applied Biological Science, Science University of Tokyo Yamazaki 2641, Noda, 278 Japan
2Biological Laboratory, Nippon Medical School Kosugi-cho 2, Nakahara-ku, Kawasaki, 211 Japan
3Department of Biology, Faculty of Science, Tokyo Metropolitan University Minamiohsawa, Hachioji, Tokyo, 192-03 Japan

The carotenoid compositions in the aerobic methylotrophic photosynthetic bacterium, Pseudomonas radiora (Methylobacterium radiotolerans) strain MD-1, were investigated. Carotenoids bound to the BChl-protein complex were identified as spirilloxanthin, anhydrorhodovibrin and rhodovibrin, which have been generally found in purple photosynthetic bacteria. The ratio of BChl a to carotenoid in the BChl-protein complex was about 2 to 1. The transfer of excitation energy from carotenoids to BChl in the BChl-protein complex was observed although its efficiency was as low as that in the purple bacterial complexes which have spirilloxanthin as the major carotenoid component. By contrast, carotenoic acids were found as major forms of carotenoids in the cells, and most of them were not bound to the BChl-protein complex. These carotenoic acids were also found as the major carotenoids in other methylotrophs that have been characterized as aerobic photosynthetic bacteria.

(Received November 28, 1994; Accepted April 21, 1995)
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