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Plant and Cell Physiology, 2001, Vol. 42, No. 12 1355-1362
© 2001 Oxford University Press

Absence of Carotenes and Presence of a Tertiary Methoxy Group in a Carotenoid from a Thermophilic Filamentous Photosynthetic Bacterium Roseiflexus castenholzii

Shinichi Takaichi1,5, Takashi Maoka2, Mitsunori Yamada3, Katsumi Matsuura3, Yuji Haikawa4 and Satoshi Hanada4

1 Biological Laboratory, Nippon Medical School, Kawasaki, 211-0063 Japan 2 Kyoto Pharmaceutical University, Kyoto, 607-8414 Japan 3 Department of Biology, Tokyo Metropolitan University, Hachioji, 192-0307 Japan 4 National Institute of Advanced Industrial Science and Technology, Tsukuba, 305-8566 Japan

We identified pigments in a thermophilic filamentous photosynthetic bacterium Roseiflexus castenholzii strain HL08. We detected neither bacteriochlorophyll (BChl) c nor carotenes in this bacterium cultured under the aerobic dark and the anaerobic light conditions, which may correspond to its lack of chlorosomes. In the cells cultured under the aerobic dark conditions, the carotenoids were derivatives of keto-{gamma}-carotene, and the major ones were methoxy-keto-myxocoxanthin and keto-myxocoxanthin glucoside fatty acid ester. Although the tertiary methoxy group at C-1' and the double bond at C-3',4' in the {psi} end group of carotenoid, such as spirilloxanthin, have only been found in purple bacteria, this was the first such report in other bacterial groups. The fatty acid moiety was composed of iso fatty acids, which were rare in the cellular lipids. In the cells cultured under the anaerobic light conditions, in addition to these keto-carotenoids, we also found non-oxidized carotenoids (derivatives of {gamma}-carotene). Concerning the esterifying alcohol of BChl a, we found a substantial amount of geranylgeraniol, although the major component was phytol. The existence of these pigments makes this bacterium unique among the known species in Chloroflexaceae.

5 Corresponding author: E-mail, takaichi@nms.ac.jp; Fax, +81-44-722-1231.


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 J. Bacteriol.Home page
M. Yamada, H. Zhang, S. Hanada, K. V. P. Nagashima, K. Shimada, and K. Matsuura
Structural and Spectroscopic Properties of a Reaction Center Complex from the Chlorosome-Lacking Filamentous Anoxygenic Phototrophic Bacterium Roseiflexus castenholzii
J. Bacteriol., March 1, 2005; 187(5): 1702 - 1709.
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