Current Microbiology

, Volume 65, Issue 2, pp 150–155 | Cite as

Carotenoids in Rhodoplanes Species: Variation of Compositions and Substrate Specificity of Predicted Carotenogenesis Enzymes

  • Shinichi Takaichi
  • Ch. Sasikala
  • Ch. V. Ramana
  • Keiko Okamura
  • Akira Hiraishi


Phototrophic bacteria necessarily contain carotenoids for photosynthesis, and accumulate unusual carotenoids in some cases. The carotenoids in all established species of Rhodoplanes (Rpl.), a representative of phototrophic genera, were identified using spectroscopic methods. The major carotenoid was spirilloxanthin in Rpl. roseus and Rpl. serenus, and rhodopin in “Rpl. cryptolactis”. Rpl. elegans contained rhodopin, anhydrorhodovibrin, and spirilloxanthin. Rpl. pokkaliisoli contained not only rhodopin but also 1,1′-dihydroxylycopene and 3,4,3′,4′-tetrahydrospirilloxanthin. These variations in carotenoid composition suggested that Rpl. roseus and Rpl. serenus had normal substrate specificity of the carotenogenesis enzymes of CrtC (acyclic carotene 1,2-hydratase), CrtD (acyclic carotenoid 3,4-desaturase), and CrtF (acyclic 1-hydroxycarotenoid methyltransferase). On the other hand, CrtC of Rpl. elegans, CrtD of “Rpl. cryptolactis”, and CrtC, CrtD, and CrtF of Rpl. pokkaliisoli might have different characteristics from the usual activity of these normal enzymes in the normal spirilloxanthin pathway. These results suggest that the variation of carotenoids among the species of Rhodoplanes results from modified substrate specificity of the carotenogenesis enzymes involved.


Carotenoid Lycopene Relative Molecular Mass Phototrophic Bacterium CrtD 
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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Shinichi Takaichi
    • 1
  • Ch. Sasikala
    • 2
  • Ch. V. Ramana
    • 3
  • Keiko Okamura
    • 4
  • Akira Hiraishi
    • 4
  1. 1.Department of BiologyNippon Medical SchoolKawasakiJapan
  2. 2.JNT University Centre for EnvironmentHyderabadIndia
  3. 3.University of Hyderabad, Plant SciencesHyderabadIndia
  4. 4.Department of Environmental and Life SciencesToyohashi University of TechnologyToyohashiJapan

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