Doklady Biochemistry and Biophysics

, Volume 483, Issue 1, pp 321–325 | Cite as

The Influence of the Number of Conjugated Double Bonds in Carotenoid Molecules on the Energy Transfer Efficiency to Bacteriochlorophyll in Light-Harvesting Complexes LH2 from Allochromatium vinosum Strain MSU

  • A. A. AshikhminEmail author
  • Z. K. Makhneva
  • M. A. Bolshakov
  • A. A. Moskalenko
Biochemistry, Biophysics, and Molecular Biology


Seven different carotenoids with the number of conjugated double bonds (N) from 5 to 11 were incorporated in vitro into carotenoidless complexes LH2 of the sulfur bacterium Allochromatium vinosum strain MSU. The efficiency of their incorporation varied from 4 to 99%. The influence of N in the carotenoid molecules on the energy transfer efficiency from these pigments to bacteriochlorophyll (BChl) in the modified LH2 complexes was studied for the first time. The highest level of energy transfer was recorded for rhodopin (N = 11) and neurosporene (N = 7) (37 and 51%, respectively). In the other carotenoids, this parameter ranged from 11 to 33%. In the LH2 complexes studied, we found no direct correlation between the decrease in N in carotenoids and increase in the energy transfer efficiency from these pigments to BChl.


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© Pleiades Publishing, Inc. 2018

Authors and Affiliations

  • A. A. Ashikhmin
    • 1
    Email author
  • Z. K. Makhneva
    • 1
  • M. A. Bolshakov
    • 1
  • A. A. Moskalenko
    • 1
  1. 1.Institute of Basic Biological ProblemsRussian Academy of SciencesPushchino, Moscow oblastRussia

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