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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">11495</article-id><article-id pub-id-type="doi">10.32607/actanaturae.11495</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">Development of Neutralizing Nanobodies to the Hemagglutinin Stem Domain of Influenza A Viruses</article-title><trans-title-group xml:lang="ru"><trans-title>Получение нейтрализующих наноантител к стеблевому домену гемагглютинина вируса гриппа типа А</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6629-744X</contrib-id><name-alternatives><name xml:lang="en"><surname>Voronina</surname><given-names>Daria V.</given-names></name><name xml:lang="ru"><surname>Воронина</surname><given-names>Дарья Владимировна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Junior Researcher of the Laboratory of Immunobiotechnology</p></bio><bio xml:lang="ru"><p>младший научный сотрудник лаборатории иммунобиотехнологии</p></bio><email>daryavoronin2009@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shcheblyakov</surname><given-names>Dmitry V.</given-names></name><name xml:lang="ru"><surname>Щебляков</surname><given-names>Дмитрий Викторович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>sdmitryv@yahoo.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Esmagambetov</surname><given-names>Ilias B.</given-names></name><name xml:lang="ru"><surname>Есмагамбетов</surname><given-names>Ильяс Булатович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>esmagambetovib@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Derkaev</surname><given-names>Artem A.</given-names></name><name xml:lang="ru"><surname>Деркаев</surname><given-names>Артем Алексеевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>derkaev.a@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Popova</surname><given-names>Olga</given-names></name><name xml:lang="ru"><surname>Попова</surname><given-names>Ольга</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>olga.popova31@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shcherbinin</surname><given-names>Dmitry N.</given-names></name><name xml:lang="ru"><surname>Щербинин</surname><given-names>Дмитрий Николаевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>dim284@inbox.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">National Research Centre for Epidemiology and Microbiology named after Honorary Academician N.F. Gamaleya of the Ministry of Health of Russia</institution></aff><aff><institution xml:lang="ru">Национальный исследовательский центр эпидемиологии и микробиологии имени почетного академика Н.Ф. Гамалеи Минздрава России</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2021-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2021</year></pub-date><volume>13</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>33</fpage><lpage>41</lpage><history><date date-type="received" iso-8601-date="2021-06-18"><day>18</day><month>06</month><year>2021</year></date><date date-type="accepted" iso-8601-date="2021-07-14"><day>14</day><month>07</month><year>2021</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2021, Voronina D.V., Shcheblyakov D.V., Esmagambetov I.B., Derkaev A.A., Popova O., Shcherbinin D.N.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2021, Воронина Д.В., Щебляков Д.В., Есмагамбетов И.Б., Деркаев А.А., Попова О., Щербинин Д.Н.</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="en">Voronina D.V., Shcheblyakov D.V., Esmagambetov I.B., Derkaev A.A., Popova O., Shcherbinin D.N.</copyright-holder><copyright-holder xml:lang="ru">Воронина Д.В., Щебляков Д.В., Есмагамбетов И.Б., Деркаев А.А., Попова О., Щербинин Д.Н.</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/11495">https://actanaturae.ru/2075-8251/article/view/11495</self-uri><abstract xml:lang="en"><p>The influenza virus infection claims ~650,000 lives annually. Taking into account the evolving resistance of the pathogen to antiviral drugs and the waning effectiveness of vaccination among certain populations, new approaches to the treatment of influenza are needed. The current study is aimed at obtaining single-domain antibodies (Nanobodies®) to the highly conserved stem domain of influenza A virus hemagglutinin by phage display. Two high-affinity neutralizing clones of Nanobodies® with a particular specificity were selected; they ensured 100% neutralization of the H1N1 and H5N2 influenza viruses in vivo. The obtained data demonstrate that it is possible to develop highly effective VHH-based drugs for the treatment of influenza.</p></abstract><trans-abstract xml:lang="ru"><p>Вирус гриппа ежегодно уносит порядка 650 000 жизней. В условиях прогрессирующей резистентности к противовирусным препаратам и сниженной эффективности вакцинации среди определенных групп населения возникает необходимость в новых подходах к терапии гриппозной инфекции. Представленная работа посвящена получению однодоменных антител (наноантител) к высококонсервативному стержневому домену гемагглютинина вируса гриппа типа А при помощи технологии фагового дисплея. В результате были отобраны два высокоаффинных клона наноантител, показавшие 100% нейтрализующую активность in vivo при заражении мышей летальными дозами вируса гриппа штаммов H1N1 и H5N2. Полученные данные указывают на возможность создания высокоэффективных препаратов на основе однодоменных антител для терапии гриппозной инфекции.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Nanobodies®</kwd><kwd>VHH</kwd><kwd>phage display</kwd><kwd>influenza virus</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>наноантитела</kwd><kwd>VHH</kwd><kwd>фаговый дисплей</kwd><kwd>вирус гриппа</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Государственное задание Министерства здравоохранения Российской Федерации</institution></institution-wrap><institution-wrap><institution xml:lang="en">State Assignment of the Ministry of Health of the Russian Federation</institution></institution-wrap></funding-source><award-id>121031800132-4</award-id></award-group><funding-statement xml:lang="ru">Исследование выполнено в рамках Государственного задания Министерства здравоохранения Российской Федерации №121031800132-4.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Gamblin S.J., Skehel J.J. // J. 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