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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">microbe</journal-id><journal-title-group><journal-title xml:lang="ru">Проблемы особо опасных инфекций</journal-title><trans-title-group xml:lang="en"><trans-title>Problems of Particularly Dangerous Infections</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0370-1069</issn><issn pub-type="epub">2658-719X</issn><publisher><publisher-name>Russian Research Anti-Plague Institute “Microbe”</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21055/0370-1069-2025-4-156-162</article-id><article-id custom-type="elpub" pub-id-type="custom">microbe-2262</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНЫЕ СТАТЬИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ORIGINAL ARTICLES</subject></subj-group></article-categories><title-group><article-title>Авирулентный пробиотический штамм Escherichia coli, продуцирующий B-субъединицу холерного токсина: получение, стабильность наследования и экспрессия клонированного гена ctxB</article-title><trans-title-group xml:lang="en"><trans-title>Avirulent Probiotic Strain of Escherichia coli, Producing the B-Subunit of Cholera Toxin: Obtainment, Stability of Inheritance, and Expression of the Cloned ctxB Gene</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3896-7762</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Чеховская</surname><given-names>Г. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Chekhovskaya</surname><given-names>G. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Чеховская Галина Викторовна, </p><p>410005, Саратов, ул. Университетская, 46</p></bio><bio xml:lang="en"><p>Galina V. Chekhovskaya, </p><p>46, Universitetskaya St., Saratov, 410005</p></bio><email xlink:type="simple">rusrapi@microbe.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0003-7100-9088</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Крепостнова</surname><given-names>И. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Krepostnova</surname><given-names>I. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>410005, Саратов, ул. Университетская, 46</p></bio><bio xml:lang="en"><p>46, Universitetskaya St., Saratov, 410005</p></bio><email xlink:type="simple">rusrapi@microbe.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3117-8229</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рыбальченко</surname><given-names>Д. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Rybal’chenko</surname><given-names>D. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>410005, Саратов, ул. Университетская, 46</p></bio><bio xml:lang="en"><p>46, Universitetskaya St., Saratov, 410005</p></bio><email xlink:type="simple">rusrapi@microbe.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0001-7163-206X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Щелканова</surname><given-names>Е. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Shchelkanova</surname><given-names>E. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>410005, Саратов, ул. Университетская, 46</p></bio><bio xml:lang="en"><p>46, Universitetskaya St., Saratov, 410005</p></bio><email xlink:type="simple">rusrapi@microbe.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7115-6286</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Смирнова</surname><given-names>Н. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Smirnova</surname><given-names>N. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>410005, Саратов, ул. Университетская, 46</p></bio><bio xml:lang="en"><p>46, Universitetskaya St., Saratov, 410005</p></bio><email xlink:type="simple">rusrapi@microbe.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФКУН «Российский научно-исследовательский противочумный институт «Микроб»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Russian Research Anti-Plague Institute “Microbe”</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>14</day><month>01</month><year>2026</year></pub-date><volume>0</volume><issue>4</issue><fpage>156</fpage><lpage>162</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Чеховская Г.В., Крепостнова И.М., Рыбальченко Д.А., Щелканова Е.Ю., Смирнова Н.И., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Чеховская Г.В., Крепостнова И.М., Рыбальченко Д.А., Щелканова Е.Ю., Смирнова Н.И.</copyright-holder><copyright-holder xml:lang="en">Chekhovskaya G.V., Krepostnova I.M., Rybal’chenko D.A., Shchelkanova E.Y., Smirnova N.I.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://journal.microbe.ru/jour/article/view/2262">https://journal.microbe.ru/jour/article/view/2262</self-uri><abstract><p>Цель исследования – получение продуцента B-субъединицы холерного токсина на основе авирулентного пробиотического штамма Escherichia coli M-17, изучение его молекулярно-генетических и иммуногенных свойств.</p><sec><title>Материалы и методы</title><p>Материалы и методы. Использовали генетически маркированный штамм E. coli KS164 thy polA (pIEM3), содержащий рекомбинантную плазмиду с клонированным геном ctxB, кодирующим B-субъединицу холерного токсина, и авирулентный штамм Е. coli M-17, применяемый для производства колисодержащих пробиотиков. Анализ штаммов проводили различными методами: молекулярно-генетическими, биохимическими и иммунологическими.</p></sec><sec><title>Результаты и обсуждение</title><p>Результаты и обсуждение. При введении методом конъюгации в клетки штамма Е. coli M-17 рекомбинантной коинтегратной плазмиды pIEM3(KmRTcR) с клонированным геном ctxB получены трансконъюганты KmRTcR с высоким уровнем продукции секретируемой B-субъединицы холерного токсина (10 мкг/мл), один из которых (КМ147) взят в качестве штамма-продуцента этого протективного антигена. Показано, что сконструированный штамм Е. coli KM147(pIEM3) KmRTcR стабильно наследует клонированный ген ctxB в составе рекомбинантной плазмиды, способен к образованию антитоксических антител у иммунизированных животных и безопасен для модельных животных. Совокупность этих свойств определяет перспективность его дальнейшего использования при конструировании профилактических и диагностических холерных препаратов.</p></sec></abstract><trans-abstract xml:lang="en"><p>The aim of the study was to obtain a cholera toxin B-subunit producer based on the avirulent probiotic strain Escherichia coli M-17 and to study its molecular-genetic and immunogenic properties.</p><sec><title>Materials and methods</title><p>Materials and methods. The genetically marked E. coli KS164 thy polA (pIEM3) strain, containing a recombinant plasmid with the cloned ctxB gene encoding the B-subunit of cholera toxin, and the avirulent E. coli M-17 strain, applied for the production of colicontaining probiotics, were used. The strains were analyzed using various methods: molecular genetics, biochemistry, and immunology.</p></sec><sec><title>Results and discussion</title><p>Results and discussion. Through introducing the recombinant cointegrate plasmid pIEM3 (KmRTcR) with the cloned ctxB gene into E. coli M-17 cells via conjugation, KmRTcR transconjugants with high levels of secreted cholera toxin B-subunit production (10 μg/ml) were obtained. One of these transconjugants (KM147) was used as the producer strain for the protective antigen. It was demonstrated that the constructed E. coli strain KM147(pIEM3) KmRTcR stably inherits the cloned ctxB gene contained in the recombinant plasmid, is capable of producing antitoxic antibodies in immunized animals, and safe for the use in model animals. These properties combined make it promising for future use in the development of prophylactic and diagnostic cholera drugs.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>Escherichia coli</kwd><kwd>рекомбинантная плазмида</kwd><kwd>клонированный ген В-субъединицы холерного токсина</kwd><kwd>авирулентность</kwd><kwd>иммуногенность</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Escherichia coli</kwd><kwd>recombinant plasmid</kwd><kwd>cloned cholera toxin B-subunit gene</kwd><kwd>avirulence</kwd><kwd>immunogenicity</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Finkelstein R.A., LoSpalluto J.J. 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