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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">Acta Naturae</journal-id><journal-title-group><journal-title xml:lang="en">Acta Naturae</journal-title><trans-title-group xml:lang="ru"><trans-title>Acta Naturae</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2075-8251</issn><publisher><publisher-name xml:lang="en">Acta Naturae Ltd</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">27741</article-id><article-id pub-id-type="doi">10.32607/actanaturae.27741</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Research 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>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">The microbiomic metaproteome of the taiga tick <italic>Ixodes persulcatus</italic> from the Tyumen region</article-title><trans-title-group xml:lang="ru"><trans-title>Метапротеом микробиома таежного клеща <italic>Ixodes persulcatus</italic> Тюменской области</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kozlova</surname><given-names>A. S.</given-names></name><name xml:lang="ru"><surname>Козлова</surname><given-names>А. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Institute of Environmental and Agricultural Biology (X-BIO)</p></bio><email>alex.zgoda23@gmail.com</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zgoda</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Згода</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alex.zgoda23@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Petushkova</surname><given-names>N. A.</given-names></name><name xml:lang="ru"><surname>Петушкова</surname><given-names>Н. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alex.zgoda23@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bolochenkov</surname><given-names>N. A.</given-names></name><name xml:lang="ru"><surname>Болоченков</surname><given-names>Н. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alex.zgoda23@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zgoda</surname><given-names>V. G.</given-names></name><name xml:lang="ru"><surname>Згода</surname><given-names>В. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alex.zgoda23@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Salnitska</surname><given-names>M. A.</given-names></name><name xml:lang="ru"><surname>Сальницкая</surname><given-names>М. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Institute of Environmental and Agricultural Biology (X-BIO)</p></bio><email>alex.zgoda23@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kazakov</surname><given-names>D. V.</given-names></name><name xml:lang="ru"><surname>Казаков</surname><given-names>Д. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Institute of Environmental and Agricultural Biology (X-BIO)</p></bio><email>alex.zgoda23@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lisitsa</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Лисица</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Institute of Environmental and Agricultural Biology (X-BIO)</p></bio><email>alex.zgoda23@gmail.com</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">University of Tyumen</institution></aff><aff><institution xml:lang="ru">ФГАОУ ВО «Тюменский государственный университет»</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Orekhovich Institute of Biomedical Chemistry</institution></aff><aff><institution xml:lang="ru">ФГБНУ «Научно-исследовательский институт биомедицинской химии имени В.Н. Ореховича»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2026-04-22" publication-format="electronic"><day>22</day><month>04</month><year>2026</year></pub-date><volume>18</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>55</fpage><lpage>63</lpage><history><date date-type="received" iso-8601-date="2025-07-07"><day>07</day><month>07</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-10-28"><day>28</day><month>10</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2026, Kozlova A.S., Zgoda A.V., Petushkova N.A., Bolochenkov N.A., Zgoda V.G., Salnitska M.A., Kazakov D.V., Lisitsa A.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2026, Козлова А.С., Згода А.В., Петушкова Н.А., Болоченков Н.А., Згода В.Г., Сальницкая М.А., Казаков Д.В., Лисица А.В.</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="en">Kozlova A.S., Zgoda A.V., Petushkova N.A., Bolochenkov N.A., Zgoda V.G., Salnitska M.A., Kazakov D.V., Lisitsa A.V.</copyright-holder><copyright-holder xml:lang="ru">Козлова А.С., Згода А.В., Петушкова Н.А., Болоченков Н.А., Згода В.Г., Сальницкая М.А., Казаков Д.В., Лисица А.В.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://actanaturae.ru/2075-8251/article/view/27741">https://actanaturae.ru/2075-8251/article/view/27741</self-uri><abstract xml:lang="en"><p>Metagenomic studies have revealed the taxonomic composition of the taiga tick (<italic>Ixodes persulcatus</italic>) microbiome, whereas metaproteomic data has provided information on the biochemically active fraction of the microbial community residing in the tick. The aim of this study was to characterize the biological processes taking place within the microbiome of the taiga tick <italic>I. persulcatus</italic> using a metaproteomic approach. To expand the range of identifiable proteins, we used two trypsin concentrations in sample preparation for mass spectrometric analysis. The metaproteomes of unfed female and male ticks were analyzed, which enabled identification of protein products encoded by 2,100 genes from microorganisms belonging to 203 bacterial and fungal species. Increased abundance of proteins associated with Ascomycota fungi, particularly abundant in females, were detected. Proteins from the pathogenic Rickettsia and Borrelia species were identified. These findings enable a transition from a taxonomic metagenomic description to a functional analysis of the microbial consortium role in the physiology of the vector tick, particularly given the identified microbiota differences related to the tick sex.</p></abstract><trans-abstract xml:lang="ru"><p>Метагеномные исследования раскрывают таксономический состав микробиома таежного клеща (<italic>Ixodes persulcatus</italic>), а сведения о биохимически активной части обитающего в клеще микробного сообщества могут быть получены из метапротеомных данных. С использованием методов метапротеомики охарактеризованы биологические процессы микробиома <italic>I. persulcatus</italic>. Проанализированы метапротеомы голодных самок и самцов, идентифицированы белковые продукты, кодируемые 2100 генами микроорганизмов, относящихся к 203 видам бактерий и грибов. Обнаружено повышение количества белков, ассоциированных с грибами класса Ascomycota, особенно выраженное у самок. Найдены белки патогенных видов риккетсий и боррелий. Для увеличения охвата идентифицируемых белков при подготовке проб к масс-спектрометрическому измерению использовали две концентрации трипсина. Полученные результаты позволяют перейти от таксономического метагеномного описания к функциональному анализу роли микробного консорциума в физиологии клеща-переносчика инфекций, в том числе с учетом обнаруженных нами различий микробиоты в зависимости от пола клеща.</p></trans-abstract><kwd-group xml:lang="en"><kwd>taiga tick Ixodes persulcatus</kwd><kwd>microbiome</kwd><kwd>metaproteome</kwd><kwd>Rickettsia</kwd><kwd>Borrelia</kwd><kwd>mass spectrometry</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>таежный клещ Ixodes persulcatus</kwd><kwd>микробиом</kwd><kwd>метапротеом</kwd><kwd>риккетсии</kwd><kwd>боррелии</kwd><kwd>масс-спектрометрия</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="en">Ministry of Science and Higher Education of the Russian Federation</institution></institution-wrap><institution-wrap><institution xml:lang="ru">Министерство науки и высшего образования Российской Федерации</institution></institution-wrap></funding-source><award-id>075-15-2024-563</award-id></award-group><funding-statement xml:lang="en">This study was performed within the framework of Agreement No. 075-15-2024-563 of April 24, 2024 “Emergent Biological Threats to Agriculture in Russia and the CIS Countries in the Context of Global Change: Pathogen Identification Using Multi-omics Screening in the Key Vectors and Environment”.</funding-statement><funding-statement xml:lang="ru">Работа выполнена в рамках Соглашения № 075-15-2024-563 от 24 апреля 2024 г. «Эмерджентные биологические угрозы для сельского хозяйства России и стран СНГ в условиях глобальных изменений: выявление патогенов с применением мультиомиксного скрининга в ключевых векторах и окружающей среде».</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Montero E, González LM, Chaparro A, et al. 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