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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Доклады Академии наук</journal-id><journal-title-group><journal-title xml:lang="en">Доклады Академии наук</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Академии наук</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-5652</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">15982</article-id><article-id pub-id-type="doi">10.31857/S0869-56524876701-705</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Biochemistry, biophysics, molecular biology</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Биохимия, биофизика, молекулярная биология</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">LH2 complexes (B800-850 AND B800-830) are assembled in the cells of sulfur bacterium Thiorhodospira sibirica, strain Kir 3, without any carotenoids</article-title><trans-title-group xml:lang="ru"><trans-title>Комплексы LH2 (В800-850 И B800-830) собираются в клетках серной бактерии Thiorhodospira sibirica, штамм Kir 3, без каротиноидов</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bolshakov</surname><given-names>M. A.</given-names></name><name xml:lang="ru"><surname>Большаков</surname><given-names>М. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>lfbv22@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ashikhmin</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Ашихмин</surname><given-names>А. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>AshikhminAA@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Makhneva</surname><given-names>Z. K.</given-names></name><name xml:lang="ru"><surname>Махнева</surname><given-names>З. К.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>lfbv22@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Moskalenko</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Москаленко</surname><given-names>А. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>lfbv22@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Basic Biological Problems of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт фундаментальных проблем биологии Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2019-09-10" publication-format="electronic"><day>10</day><month>09</month><year>2019</year></pub-date><volume>487</volume><issue>6</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>701</fpage><lpage>705</lpage><history><date date-type="received" iso-8601-date="2019-09-06"><day>06</day><month>09</month><year>2019</year></date><date date-type="accepted" iso-8601-date="2019-09-06"><day>06</day><month>09</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, Russian academy of sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Российская академия наук</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">Russian academy of sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0869-5652/article/view/15982">https://journals.eco-vector.com/0869-5652/article/view/15982</self-uri><abstract xml:lang="en"><p>It has been studied the result of assembling the light-harvesting complexes in the cells of purple sulfuric bacterium <italic>Thiorhodospira</italic> (<italic>T</italic>.) <italic>sibirica</italic>, strain Kir‑3, while suppressing biosynthesis of carotenoids by diphenylamine (DPA). LH2 complexes (B800-850 and B800-830) with different carotenoids’ composition were isolated from the cells obtained. Maximal inhibition of carotenoid biosynthesis (~90% of the control) was achieved at the inhibitor concentration of 53,25 mM (9 mg/l). It has been established that changes in qualitative and quantitative composition of carotenoids do not affect the assembling of B800-830 and B800-850 complexes. It is assumed that in the population of DPA-LH2 complexes from <italic>T</italic>. <italic>sibirica</italic>, strain Kir‑3, both carotenoidless complexes and the complexes, containing one or two carotenoid molecules, can be assembled. These results support a hypothesis that carotenoids are not required for assembling B800-850 and B800-830 complexes.</p></abstract><trans-abstract xml:lang="ru"><p>Изучен результат сборки светособирающих комплексов в клетках пурпурной серной бактерии <italic>Thiorhodospira </italic>(<italic>T</italic>.) <italic>sibirica</italic>, штамм Kir‑3, при подавлении биосинтеза каротиноидов дифениламином (ДФА). Из полученных клеток были выделены комплексы LH2 (В800-850 и В800-830) с разным составом каротиноидов. Максимального ингибирования биосинтеза каротиноидов (~90% от контроля) удалось добиться при концентрации ингибитора 53,25 мкМ (9 мг/л). Установлено, что изменения в качественном и количественном составе каротиноидов не влияют на сборку комплексов В800-830 и В800-850. Предполагается, что в популяции ДФА‑комплексов LH2 из <italic>T</italic>.<italic> sibirica</italic>, штамм Kir‑3, могут собираться как бескаротиноидные комплексы, так и комплексы, содержащие одну-две молекулы каротиноидов. Эти результаты подтверждают гипотезу о том, что каротиноиды не требуются для сборки комплексов В800-850 и В800-830.</p></trans-abstract><kwd-group xml:lang="en"><kwd>carotenoids</kwd><kwd>inhibitor of carotenoid biosynthesis</kwd><kwd>HPLC</kwd><kwd>pigment-protein complexes</kwd><kwd>pigment-containing membranes</kwd><kwd>diphenylamine</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>каротиноиды</kwd><kwd>подавление биосинтеза</kwd><kwd>каротиноидов</kwd><kwd>HPLC</kwd><kwd>пигмент-белковые комплексы</kwd><kwd>пигмент-содержащие мембраны</kwd><kwd>дифениламин</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="en">Russian Foundation for Basic Research</institution></institution-wrap><institution-wrap><institution xml:lang="ru">Российский фонд фундаментальных исследований</institution></institution-wrap></funding-source><award-id></award-id></award-group><award-group><funding-source><institution-wrap><institution xml:lang="en">Russian Foundation for Basic Research</institution></institution-wrap><institution-wrap><institution xml:lang="ru">Российский фонд фундаментальных исследований</institution></institution-wrap></funding-source><award-id></award-id></award-group><award-group><funding-source><institution-wrap><institution xml:lang="en">Russian Foundation for Basic Research</institution></institution-wrap><institution-wrap><institution xml:lang="ru">Российский фонд фундаментальных исследований</institution></institution-wrap></funding-source><award-id></award-id></award-group><award-group><funding-source><institution-wrap><institution xml:lang="en">State task</institution></institution-wrap><institution-wrap><institution xml:lang="ru">Государственное задание</institution></institution-wrap></funding-source><award-id></award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Cogdell R. J., Gall A., Köhler J. 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