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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

  • Biochemistry, Biophysics, and Molecular Biology
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Abstract

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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Authors and Affiliations

  1. Institute of Basic Biological Problems, Russian Academy of Sciences, Pushchino, Moscow oblast, 142290, Russia

    A. A. Ashikhmin, Z. K. Makhneva, M. A. Bolshakov & A. A. Moskalenko

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  1. A. A. Ashikhmin
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  2. Z. K. Makhneva
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  3. M. A. Bolshakov
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  4. A. A. Moskalenko
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Correspondence to A. A. Ashikhmin.

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Original Russian Text © A.A. Ashikhmin, Z.K. Makhneva, M.A. Bolshakov, A.A. Moskalenko, 2018, published in Doklady Akademii Nauk, 2018, Vol. 483, No. 3.

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Ashikhmin, A.A., Makhneva, Z.K., Bolshakov, M.A. et al. 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. Dokl Biochem Biophys 483, 321–325 (2018). https://doi.org/10.1134/S160767291806008X

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  • DOI: https://doi.org/10.1134/S160767291806008X

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