Journal Article

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

Shinichi Takaichi, Takashi Maoka, Mitsunori Yamada, Katsumi Matsuura, Yuji Haikawa and Satoshi Hanada

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 42, issue 12, pages 1355-1362
Published in print December 2001 | ISSN: 0032-0781
Published online December 2001 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pce172
Absence of Carotenes and Presence of a Tertiary Methoxy Group in a Carotenoid from a Thermophilic Filamentous Photosynthetic Bacterium Roseiflexus castenholzii

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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-γ-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 ψ 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 γ-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.

Keywords: Key words: Bacteriochlorophyll — Carotenoid — Carotenoid glycoside ester — Chloroflexaceae — Roseiflexus castenholzii.; Abbreviations: BChl, bacteriochlorophyll; Cfl., Chloroflexus; NMR, nuclear magnetic resonance; R., Roseiflexus.

Journal Article.  4653 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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