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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">Doklady Biological Sciences</journal-id><journal-title-group><journal-title xml:lang="en">Doklady Biological Sciences</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Российской академии наук. Науки о жизни</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2686-7389</issn><issn publication-format="electronic">3034-5057</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">686381</article-id><article-id pub-id-type="doi">10.31857/S2686738925030079</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</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">Evidence for functionality of transmembrane domains of predicted non-canonical plant phosphotransmitters</article-title><trans-title-group xml:lang="ru"><trans-title>Свидетельства в пользу функциональности трансмембранных доменов предсказанных неканонических растительных фосфотрансмиттеров</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lomin</surname><given-names>S. N.</given-names></name><name xml:lang="ru"><surname>Ломин</surname><given-names>С. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>savelievaek@ya.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>savelievaek@ya.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Elanskaya</surname><given-names>A. S.</given-names></name><name xml:lang="ru"><surname>Еланская</surname><given-names>А. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>savelievaek@ya.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Arkhipov</surname><given-names>D. V.</given-names></name><name xml:lang="ru"><surname>Архипов</surname><given-names>Д. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>savelievaek@ya.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>savelievaek@ya.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Timiryazev Institute of Plant Physiology of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт физиологии растений им. К.А. Тимирязева Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-06-15" publication-format="electronic"><day>15</day><month>06</month><year>2025</year></pub-date><volume>522</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>358</fpage><lpage>363</lpage><history><date date-type="received" iso-8601-date="2025-06-29"><day>29</day><month>06</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-06-29"><day>29</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</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/2686-7389/article/view/686381">https://journals.eco-vector.com/2686-7389/article/view/686381</self-uri><abstract xml:lang="en"><p>Bioinformatic methods have been used to predict a new subclass of proteins among plant phosphotransmitters involved in the signaling system of multistep phosphorelay. In contrast to the canonical soluble nucleocytosolic forms, the found phosphotransmitter sequences, belonging to a wide range of plant taxa, potentially contain transmembrane domains. This suggests localization of such proteins on cell membranes and, therefore, a different function in signaling than that of canonical phosphotransmitters. We tested the functionality of the transmembrane domain of the phosphotransmitter using the protein of the tea plant <italic>Camellia sinensis</italic>. Membrane localization of the transiently expressed recombinant phosphotransmitter with this domain was confirmed by microscopy and immunoblotting. Thus, for the first time, experimental evidence was obtained for the existence of membrane-bound plant phosphotransmitters with as yet unknown functions. These data suggest the presence of a non-canonical membrane branch of signal transduction in the multistage phosphotransfer system in plants.</p></abstract><trans-abstract xml:lang="ru"><p>Биоинформатическими методами предсказан новый подкласс белков среди растительных фосфотрансмиттеров, участвующих в сигнальной системе многоступенчатого фосфопереноса. В отличие от канонических растворимых нуклео-цитозольных форм, найденные последовательности неканонических фосфотрансмиттеров, относящиеся к широкому ряду растительных таксонов, потенциально содержат трансмембранные домены. Это предполагает локализацию таких белков на клеточных мембранах и, следовательно, иную функцию в сигналинге, чем у канонических фосфотрансмиттеров. Мы проверили функциональность трансмембранного домена фосфотрансмиттера на примере белка растения чая <italic>Camellia sinensis</italic>. Мембранная локализация транзиентно экспрессированного рекомбинантного фосфотрансмиттера с этим доменом подтверждена методами микроскопирования и иммуноблоттинга. Таким образом, впервые получены экспериментальные свидетельства в пользу существования мембраносвязанных растительных фосфотрансмиттеров с пока неизвестными функциями. Эти данные позволяют предположить наличие неканонической мембранной ветви передачи сигнала в системе многоступенчатого фосфопереноса у растений.</p></trans-abstract><kwd-group xml:lang="en"><kwd>phosphotransmitters</kwd><kwd>transmembrane domain</kwd><kwd>signal transduction</kwd><kwd>recombinant proteins</kwd><kwd>cytokinins</kwd><kwd>plants</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>фосфотрансмиттеры</kwd><kwd>трансмембранный домен</kwd><kwd>передача сигнала</kwd><kwd>рекомбинантные белки</kwd><kwd>цитокинины</kwd><kwd>растения</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский научный фонд</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Science Foundation</institution></institution-wrap></funding-source><award-id>23-74-10026</award-id></award-group></funding-group></article-meta><fn-group><fn xml:lang="en"><p>Presented by Academician of the RAS S.G. Georgieva</p></fn><fn xml:lang="ru"><p>Представлено академиком РАН С.Г. Георгиевой</p></fn></fn-group></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Mira-Rodado V. New Insights into Multistep-Phosphorelay (MSP)/Two-Component System (TCS) Regulation: Are Plants and Bacteria That Different? // Plants. 2019. № 8. Р. 590.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Argueso C.T., Kieber J.J. Cytokinin: From autoclaved DNA to two-component signaling // Plant Cell. 2024. № 36. Р. 1429.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Huo R., Liu Z., Yu X., Li Z. The Interaction Network and Signaling Specificity of Two-Component System in Arabidopsis // International Journal of Molecular Sciences. 2020. 21(14):4898. https://doi.org/10.3390/ijms21144898</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>Arkhipov D.V., Lomin S.N., Myakushina Y.A., et al. 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