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Spirilloxanthin incorporation into the LH2 and LH1-RC pigment-protein complexes from a purple sulfur bacterium Allochromatium minutissimum

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Abstract

Incorporation of spirilloxanthin into carotenoidless LH2 and LH1-RC complexes from a purple sulfur bacterium Allochromatium (Alc.) minutissimum was studied. Carotenoidless cells of Alc. minutissimum were obtained using diphenylamine, a carotenoid biosynthesis inhibitor. In the course of incorporation of the carotenoid mixture, the composition of which corresponded to that of Alc. minutissimum control photosynthetic membranes, no selective incorporation of spirilloxanthin into the LH1-RC complex was detected. It is assumed that in vivo carotenoids are not incorporated into the LH2 and LH1-RC complexes from a common pool. Pure spirilloxanthin destroys both the LH2 and LH1-RC complexes. Within the concentration range of spirilloxanthin in the incorporated mixture from 27% to 52%, it was found to be incorporated into the LH2 and LH1-RC complexes with the efficiency of 13% and 33%, respectively. The possible existence of different sites of assembly for the LH2 and LH1-RC complexes is discussed, as well as of two fractions of LH2 complexes, in one of which rhodopin may be integrated, and in the other (minor) one, spirilloxanthin.

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Correspondence to M. A. Bol’shakov.

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Original Russian Text © M.A. Bol’shakov, A.A. Ashikhmin, Z.K. Makhneva, A.A. Moskalenko, 2017, published in Mikrobiologiya, 2017, Vol. 86, No. 5, pp. 538–550.

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Bol’shakov, M.A., Ashikhmin, A.A., Makhneva, Z.K. et al. Spirilloxanthin incorporation into the LH2 and LH1-RC pigment-protein complexes from a purple sulfur bacterium Allochromatium minutissimum . Microbiology 86, 549–559 (2017). https://doi.org/10.1134/S0026261717050058

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