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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="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Mycology and Phytopathology</journal-id><journal-title-group><journal-title xml:lang="en">Mycology and Phytopathology</journal-title><trans-title-group xml:lang="ru"><trans-title>Микология и фитопатология</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0026-3648</issn><issn publication-format="electronic">3034-5421</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">655206</article-id><article-id pub-id-type="doi">10.31857/S0026365622600626</article-id><article-id pub-id-type="edn">NMRUHT</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>EXPERIMENTAL ARTICLES</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ЭКСПЕРИМЕНТАЛЬНЫЕ СТАТЬИ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Quorum Sensing in <italic>Chromobacterium subtsugae</italic> (Previously – <italic>C</italic>. <italic>violaceum</italic>) Is Inhibited by Gamma-Lactones, the Minor Components of Eucalyptus Leaf Extract</article-title><trans-title-group xml:lang="ru"><trans-title>Система “кворум сенсинга” у <italic>Chromobacterium subtsugae</italic> (ранее <italic>C</italic>. <italic>violaceum</italic>) ингибируется гамма-лактонами – минорными компонентами экстракта листьев эвкалипта</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Inchagova</surname><given-names>K. S.</given-names></name><name xml:lang="ru"><surname>Инчагова</surname><given-names>К. С.</given-names></name></name-alternatives><email>dgderyabin@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Duskaev</surname><given-names>G. K.</given-names></name><name xml:lang="ru"><surname>Дускаев</surname><given-names>Г. К.</given-names></name></name-alternatives><email>dgderyabin@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Deryabin</surname><given-names>D. G.</given-names></name><name xml:lang="ru"><surname>Дерябин</surname><given-names>Д. Г.</given-names></name></name-alternatives><email>dgderyabin@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Federal Scientific Center for Biological Systems and Agrotechnologies, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Федеральный научный центр биологических систем и агротехнологий 
Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-01-01" publication-format="electronic"><day>01</day><month>01</month><year>2023</year></pub-date><volume>92</volume><issue>1</issue><fpage>47</fpage><lpage>56</lpage><history><date date-type="received" iso-8601-date="2025-02-10"><day>10</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, К.С. Инчагова, Г.К. Дускаев, Д.Г. Дерябин</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, К.С. Инчагова, Г.К. Дускаев, Д.Г. Дерябин</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">К.С. Инчагова, Г.К. Дускаев, Д.Г. Дерябин</copyright-holder><copyright-holder xml:lang="ru">К.С. Инчагова, Г.К. Дускаев, Д.Г. Дерябин</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0026-3648/article/view/655206">https://journals.eco-vector.com/0026-3648/article/view/655206</self-uri><abstract xml:lang="en"><p id="idm45181327008336"><bold>Abstract</bold>—The goal of the study was to investigate the mechanism of quorum sensing (QS) inhibition in the model bacterium <italic>Chromobacterium subtsugae</italic> 026 (previously – <italic>C. violaceum</italic> 026) by <italic>Eucalyptus viminalis</italic> Labill leaf extract, and to identify the plant-derived components that provide this biological activity. The raw extract showed pronounced anti-QS activity within a broad concentrations range which were an order of magnitude lower than required for bacterial growth suppression (the MIC<sub>50</sub>/EC<sub>50</sub> ratio of 43.6). Chemical analysis of the extract revealed six small plant-derived molecules: pyrogallol, 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-1, <italic>p</italic>-cymene, 4-((1E)-3-hydroxy-1-propenyl)-2-methoxyphenol, gallic and palmitic acids, whose inhibitory effect on QS in <italic>Chromobacterium </italic>spp. has previously been shown by in vitro experiments or predicted by <italic>in silico</italic> models. In addition, minor components γ-caprolactone and γ-octanolactone, structurally similar to acylated homoserine lactones, QS autoinducers in <italic>Chromobacterium</italic> spp., were found in the extract. Chemically synthesized analogs of these molecules showed anti-QS activity in the <italic>C. subtsugae</italic> 026 bioassay (ЕС<sub>50</sub> = 354.2 and 145.6 µg/mL, respectively). Enrichment of the <italic>E. viminalis</italic> leaf extract with γ-caprolactone or γ-octanolactone significantly increased the anti-QS activity of these compositions, which was determined by isobolographic analysis as additive or superadditive effects.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45181327008352">Целью работы является исследование природы ингибирования системы “кворум сенсинга” (QS) у модельной бактерии <italic>Chromobacterium subtsugae</italic> 026 (ранее – <italic>C. violaceum</italic> 026) экстрактом листьев эвкалипта прутовидного (<italic>Eucalyptus viminalis</italic> Labill) с идентификацией в его составе молекул с соответствующим вариантом биологической активности. Тестирование цельного экстракта показало выраженную QS-ингибирующую активность, развивающуюся в широком диапазоне концентраций, в несколько десятков раз ниже требуемых для подавления бактериального роста (соотношение МИК<sub>50</sub>/EC<sub>50</sub> = 43.6). Химический анализ обнаруживал в экстракте присутствие шести малых молекул растительного происхождения (пирогаллол, 2,3-дигидро-3,5-дигидрокси-6-метил-4H-пиран-4-1, цимол, 4-((1E)-3-гидрокси-1-пропенил)-2-метоксифенол, галловая и пальмитиновая кислоты). QS-ингибирующий эффект этих соединений в отношении <italic>Chromobacterium</italic> spp. ранее был показан в экспериментах <italic>in vitro</italic> или предсказан на моделях <italic>in silico.</italic> Среди минорных компонентов анализируемого экстракта идентифицированы γ-капролактон и γ-октанолактон, структуры которых демонстрировали сходство с автоиндукторами QS – ацилированными гомосеринлактонами. Исследование химически синтезированных аналогов данных молекул в биотесте на <italic>C. subtsugae</italic> 026 впервые показало наличие у них QS-ингибирующей активности, характеризуемой величинами ЕС<sub>50</sub> = 354.2 и 145.6 мкг/мл соответственно. Обогащение цельного экстракта листьев эвкалипта прутовидного γ‑капролактоном или γ-октанолактоном существенно усиливало QS-ингибирующее действие подобных композиций, при изоболографическом анализе оцениваемое как взаимодополняющий (аддитивный) или взаимно потенцируемый (супераддитивный) эффекты.</p></trans-abstract><kwd-group xml:lang="en"><kwd>quorum sensing</kwd><kwd><italic>Chromobacterium subtsugae</italic></kwd><kwd><italic>Eucalyptus viminalis</italic></kwd><kwd>γ-caprolactone</kwd><kwd>γ-octanolactone</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>quorum sensing</kwd><kwd><italic>Chromobacterium subtsugae</italic></kwd><kwd><italic>Eucalyptus viminalis</italic></kwd><kwd>γ-капролактон</kwd><kwd>γ-октанолактон</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Дерябин Д.Г., Галаджиева А.А., Косян Д.Б., Дускаев Г.К. 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