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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">10454</article-id><article-id pub-id-type="doi">10.32607/20758251-2016-8-2-116-126</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">A Fusion Protein Based on the Second Subunit of Hemagglutinin of Influenza A/H2N2 Viruses Provides Cross Immunity</article-title><trans-title-group xml:lang="ru"><trans-title>Гибридный белок на основе второй субъединицы гемагглютинина вирусов гриппа A/H2N2 формирует перекрестный иммунитет</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Stepanova</surname><given-names>L. A.</given-names></name><name xml:lang="ru"><surname>Степанова</surname><given-names>Л. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>stepanoval60@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sergeeva</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Сергеева</surname><given-names>M. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>stepanoval60@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shuklina</surname><given-names>M. A.</given-names></name><name xml:lang="ru"><surname>Шуклина</surname><given-names>M. A.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>stepanoval60@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shaldzhyan</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Шалджян</surname><given-names>A. A.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>stepanoval60@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Potapchuk</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Потапчук</surname><given-names>M. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>stepanoval60@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Korotkov</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Коротков</surname><given-names>A. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>stepanoval60@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tsybalova</surname><given-names>L. M.</given-names></name><name xml:lang="ru"><surname>Цыбалова</surname><given-names>Л. M.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>stepanoval60@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Research Institute of Influenza</institution></aff><aff><institution xml:lang="ru">Научно-исследовательский институт гриппа МЗ РФ</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2016-06-15" publication-format="electronic"><day>15</day><month>06</month><year>2016</year></pub-date><volume>8</volume><issue>2</issue><issue-title xml:lang="en">VOL 8, NO2 (2016)</issue-title><issue-title xml:lang="ru">ТОМ 8, №2 (2016)</issue-title><fpage>116</fpage><lpage>126</lpage><history><date date-type="received" iso-8601-date="2020-01-17"><day>17</day><month>01</month><year>2020</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2016, Stepanova L.A., Sergeeva M.V., Shuklina M.A., Shaldzhyan A.A., Potapchuk M.V., Korotkov A.V., Tsybalova L.M.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2016, Степанова Л.А., Сергеева M.В., Шуклина M.A., Шалджян A.A., Потапчук M.В., Коротков A.В., Цыбалова Л.M.</copyright-statement><copyright-year>2016</copyright-year><copyright-holder xml:lang="en">Stepanova L.A., Sergeeva M.V., Shuklina M.A., Shaldzhyan A.A., Potapchuk M.V., Korotkov A.V., Tsybalova L.M.</copyright-holder><copyright-holder xml:lang="ru">Степанова Л.А., Сергеева M.В., Шуклина M.A., Шалджян A.A., Потапчук M.В., Коротков A.В., Цыбалова Л.M.</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/10454">https://actanaturae.ru/2075-8251/article/view/10454</self-uri><abstract xml:lang="en"><p>Conserved fragments of the second subunit of hemagglutinin (HA2) are of great interest for the design of vaccine constructs that can provide protective immunity against influenza A viruses of different subtypes. A recombinant fusion protein, FlgMH, was constructed on the basis of flagellin and a highly conserved HA2 fragment (35-107) of influenza viruses of the subtype A/H2N2, containing B cell, CD4+ T cell, and CD8+ T cell epitopes. The native conformation of the HA2 fragment was partially preserved upon its attachment to the C-terminus of flagellin within the recombinant fusion protein FlgMH. FlgMH was shown to stimulate a mixed Th1/Th2 response of cross-reactive antibodies, which bind to influenza viruses of the first phylogenetic group (H1, H2, H5), to the target sequence as well as the induction of specific cytotoxic T cells (CD3+CD8+IFNγ+). Immunization with the recombinant protein protected animals from a lethal influenza infection. The developed FlgMH protein is a promising agent that may be included in an influenza vaccine with a wide spectrum of action which will be able to stimulate the T and B cell immune responses.</p></abstract><trans-abstract xml:lang="ru"><p>Консервативные участки второй субъединицы гемагглютинина (НА2) представляют интерес для дизайна вакцинных конструкций, способных обеспечить протективный иммунитет против вирусов гриппа А различных подтипов. На основе флагеллина и высококонсервативного фрагмента НА2 (35-107) вирусов гриппа подтипа A/H2N2, содержащего В-клеточные, CD4+ Т-клеточные, а также CD8+ Т-клеточные эпитопы, сконструирован гибридный рекомбинантный белок FlgMH. Нативная конформация фрагмента НА2 частично сохранялась при присоединении к C-концу флагеллина в составе гибридного рекомбинантного белка FlgMH. Показано, что FlgMH стимулирует формирование смешанного Тh1/Тh2-ответа на целевую последовательность, перекрестно реагирующих антител, связывающихся с вирусами гриппа первой филогенетической группы (H1, H2, H5), и индукцию специфических цитотоксических Т-лимфоцитов (CD3+CD8+ИФН-γ+). Иммунизация рекомбинантным белком защищала животных от летальной гриппозной инфекции. Сконструированный белок FlgMH перспективен для включения в противогриппозную вакцину широкого спектра действия, способную стимулировать Т- и В-клеточный иммунный ответ.</p></trans-abstract><kwd-group xml:lang="en"><kwd>vaccine</kwd><kwd>influenza</kwd><kwd>HA2</kwd><kwd>recombinant protein</kwd><kwd>flagellin</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>вакцина</kwd><kwd>грипп</kwd><kwd>НА2</kwd><kwd>рекомбинантный белок</kwd><kwd>флагеллин</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was supported by the Russian Science Foundation (project No. 15-14-00043).</funding-statement><funding-statement xml:lang="ru">Работа выполнена при поддержке Российского научного фонда (проект № 15-14-00043).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>[1] Skehel J.J., Wiley D.C. // Annu. Rev. 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