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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">17766</article-id><article-id pub-id-type="doi">10.31857/S0869-56524886673-676</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">Comparative analysis of the biosynthesis of isoprenoid and aromatic cytokinins</article-title><trans-title-group xml:lang="ru"><trans-title>Сравнительный анализ биосинтеза ароматических и изопреноидных цитокининов</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Oslovsky</surname><given-names>V. E.</given-names></name><name xml:lang="ru"><surname>Ословский</surname><given-names>В. Е.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>smikh@eimb.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Savelieva</surname><given-names>E. M.</given-names></name><name xml:lang="ru"><surname>Савельева</surname><given-names>Е. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>smikh@eimb.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Drenichev</surname><given-names>M. S.</given-names></name><name xml:lang="ru"><surname>Дреничев</surname><given-names>М. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>smikh@eimb.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Romanov</surname><given-names>G. A.</given-names></name><name xml:lang="ru"><surname>Романов</surname><given-names>Г. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>smikh@eimb.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Mikhailov</surname><given-names>S. N.</given-names></name><name xml:lang="ru"><surname>Михайлов</surname><given-names>С. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>smikh@eimb.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Engelhardt Institute of Molecular Biology of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт молекулярной биологии имени В.А. Энгельгардта Российской академии наук</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">K.A. Timiryazev Institute of Plant Physiology of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт физиологии растений имени К.А. Тимирязева Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2019-10-30" publication-format="electronic"><day>30</day><month>10</month><year>2019</year></pub-date><volume>488</volume><issue>6</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>673</fpage><lpage>676</lpage><history><date date-type="received" iso-8601-date="2019-11-14"><day>14</day><month>11</month><year>2019</year></date><date date-type="accepted" iso-8601-date="2019-11-14"><day>14</day><month>11</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/17766">https://journals.eco-vector.com/0869-5652/article/view/17766</self-uri><abstract xml:lang="en"><p>To compare the biosynthesis pathways of aromatic and isoprenoid cytokinins, a series of nucleoside derivatives of natural cytokinins was synthesized and their cytokinin activity was determined in a test system based on the model plant <italic>Arabidopsis thaliana</italic>. Cytokinin nucleosides are known to lack the hormonal activity until cleaving the ribose moiety at the position 9. Our experiments have shown that both ribo- and 5′-deoxyribo derivatives of <italic>N </italic><sup>6</sup>-isopentenyladenine were able to turn into active cytokinins <italic>in planta</italic> exhibiting cytokinin activity. By contrast, 5′-deoxy nucleosides of aromatic cytokinins did not show similar activity. Since 5′-deoxy nucleosides cannot phosphorylate in vivo, the direct pathway of active cytokinin formation by cleavage of nucleotides is blocked here. The detected activity in 5′-deoxy nucleosides of isoprenoid cytokinins and the lack of the activity in 5′-deoxy nucleosides of aromatic cytokinins indicates a difference in the biosynthesis of these compounds.</p></abstract><trans-abstract xml:lang="ru"><p>С целью сравнительного изучения путей биосинтеза ароматических и изопреноидных цитокининов получена серия нуклеозидных производных природных цитокининов и определена их гормональная активность в тест-системе на основе проростков <italic>Arabidopsis thaliana</italic>. Известно, что цитокининовые нуклеозиды не обладают гормональной активностью и приобретают её только после удаления остатка рибозы в <italic>N </italic><sup>9</sup>-положении. Опыты показали, что рибо- и 5′-дезоксирибопроизводные <italic>N </italic><sup>6</sup>-изопентенил-аденина способны превращаться в активный цитокинин in planta и проявляли цитокининовую активность, в то время как 5′-дезоксинуклеозиды ароматических цитокининов были неактивными. Поскольку 5′-дезоксинуклеозиды не способны фосфорилироваться in vivo, прямой путь образования активных цитокининов за счёт расщепления нуклеотидов становится невозможным. Обнаружение активности 5′-дезоксинуклеозидов изопреноидных цитокининов и отсутствие активности у 5′-дезоксинуклеозидов ароматических цитокининов указывает на различие в их биосинтезе.</p></trans-abstract><kwd-group xml:lang="en"><kwd>cytokinins</kwd><kwd>biosynthesis</kwd><kwd>cytokinin nucleosides</kwd><kwd>cytokinin activity</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>цитокинины</kwd><kwd>биосинтез</kwd><kwd>цитокининовые нуклеозиды</kwd><kwd>цитокининовая активность</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was supported by the RFBR grants No. 18-34-00084 and No. 17-04-00969.</funding-statement><funding-statement xml:lang="ru">Работа выполнена при поддержке грантов РФФИ № 18-34-00084 и № 17-04-00969.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation> Sakakibara H. // Annu. Rev. Plant Biol. 2006. V. 57. 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