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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">10362</article-id><article-id pub-id-type="doi">10.32607/20758251-2018-10-1-85-94</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">Influence of the Linking Order of Fragments of HA2 and M2e of the influenza A Virus to Flagellin on the Properties of Recombinant Proteins</article-title><trans-title-group xml:lang="ru"><trans-title>Влияние порядка присоединения фрагментов НА2 и М2е вирусов гриппа A к флагеллину на свойства рекомбинантных белков</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>Kotlyarov</surname><given-names>R. Y.</given-names></name><name xml:lang="ru"><surname>Котляров</surname><given-names>Р Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>stepanoval60@mail.ru</email><xref ref-type="aff" rid="aff2"/></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>М. 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>Blochina</surname><given-names>E. A.</given-names></name><name xml:lang="ru"><surname>Блохина</surname><given-names>Е. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>stepanoval60@mail.ru</email><xref ref-type="aff" rid="aff2"/></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>М. 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>Potapchuk</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Потапчук</surname><given-names>М. 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>Kovaleva</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Ковалева</surname><given-names>А. 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>Ravin</surname><given-names>N. V.</given-names></name><name xml:lang="ru"><surname>Равин</surname><given-names>Н. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>stepanoval60@mail.ru</email><xref ref-type="aff" rid="aff2"/></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. М.</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, Russian Federation Ministry of Health</institution></aff><aff><institution xml:lang="ru">Научно-исследовательский институт гриппа Министерства здравоохранения Российской Федерации</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Institute of Bioengineering, Research Center of Biotechnology of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт биоинженерии, Исследовательский центр биотехнологии РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2018-03-15" publication-format="electronic"><day>15</day><month>03</month><year>2018</year></pub-date><volume>10</volume><issue>1</issue><issue-title xml:lang="en">VOL 10, NO1 (2018)</issue-title><issue-title xml:lang="ru">ТОМ 10, №1 (2018)</issue-title><fpage>85</fpage><lpage>94</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 ©; 2018, Stepanova L.A., Kotlyarov R.Y., Shuklina M.A., Blochina E.A., Sergeeva M.V., Potapchuk M.V., Kovaleva A.A., Ravin N.V., Tsybalova L.M.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2018, Степанова Л.А., Котляров Р.Ю., Шуклина М.А., Блохина Е.А., Сергеева М.В., Потапчук М.В., Ковалева А.А., Равин Н.В., Цыбалова Л.М.</copyright-statement><copyright-year>2018</copyright-year><copyright-holder xml:lang="en">Stepanova L.A., Kotlyarov R.Y., Shuklina M.A., Blochina E.A., Sergeeva M.V., Potapchuk M.V., Kovaleva A.A., Ravin N.V., Tsybalova L.M.</copyright-holder><copyright-holder xml:lang="ru">Степанова Л.А., Котляров Р.Ю., Шуклина М.А., Блохина Е.А., Сергеева М.В., Потапчук М.В., Ковалева А.А., Равин Н.В., Цыбалова Л.М.</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/10362">https://actanaturae.ru/2075-8251/article/view/10362</self-uri><abstract xml:lang="en"><p>The ectodomain of the M2 protein (M2e) and the conserved fragment of the second subunit of hemagglutinin (HA2) are promising candidates for broadly protective vaccines. In this paper, we report on the design of chimeric constructs with differing orders of linkage of four tandem copies of M2e and the conserved fragment of HA2 (76-130) from phylogenetic group II influenza A viruses to the C-terminus of flagellin. The 3D-structure of two chimeric proteins showed that interior location of the M2e tandem copies (Flg-4M2e-HA2) provides partial α-helix formation nontypical of native M2e on the virion surface. The C-terminal position of the M2e tandem copies (Flg-HA2-4M2e) largely retained its native M2e conformation. These conformational differences in the structure of the two chimeric proteins were shown to affect their immunogenic properties. Different antibody levels induced by the chimeric proteins were detected. The protein Flg-HA2-4M2e was more immunogenic as compared to Flg-4M2e-HA2, with the former offering full protection to mice against a lethal challenge. We obtained evidence suggesting that the order of linkage of target antigens in a fusion protein may influence the 3D conformation of the chimeric construct, which leads to changes in immunogenicity and protective potency.</p></abstract><trans-abstract xml:lang="ru"><p>Эктодомен белка М2 и консервативные регионы второй субъединицы НА являются перспективными антигенами для создания вакцин с широким протективным потенциалом. На основе флагеллина, четырех копий эктодомена белка М2 вирусов гриппа А и консервативного фрагмента НА2 (76-130) вирусов гриппа филогенетической группы II, содержащего В-клеточные, CD4+ и CD8+ Т-клеточные эпитопы, сконструированы два гибридных рекомбинантных белка с различным порядком присоединения таргетных антигенов к С-концу флагеллина. 3D-моделирование структуры двух гибридных белков показало, что внутренняя локализация четырех копий М2е приводила к частичной α-спирализации, нехарактерной для нативной конформации М2е на поверхности вириона. Концевое расположение М2е в большей степени обеспечивало сохранность нативной конформации М2е. Конформационные различия в структуре двух белков влияли на их иммуногенность. Выявлены различия в уровне продукции антител двумя гибридными белками. Белок с концевым положением М2е был более иммуногенным, чем белок с концевым положением участка НА2. Иммунизация гибридным белком с концевым расположением М2е полностью защищала животных от летального заражения. Показано, что порядок расположения таргетных антигенов в рекомбинантном белке может влиять на третичную структуру рекомбинантного белка, а также на его иммуногенность и протективный эффект.</p></trans-abstract><kwd-group xml:lang="en"><kwd>influenza</kwd><kwd>vaccine</kwd><kwd>HA2</kwd><kwd>M2e</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>М2е</kwd><kwd>рекомбинантный белок</kwd><kwd>флагеллин</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was supported by the Russian Scientific Foundation (grant № 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] Fan J., Liang X., Horton M.S., Perry H.C., Citron M.P., Heidecker G.J., Fu T.M., Joyce J., Przysiecki C.T., Keller P.M. // Vaccine. 2004. 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