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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">Journal of microbiology, epidemiology and immunobiology</journal-id><journal-title-group><journal-title xml:lang="en">Journal of microbiology, epidemiology and immunobiology</journal-title><trans-title-group xml:lang="ru"><trans-title>Журнал микробиологии, эпидемиологии и иммунобиологии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0372-9311</issn><issn publication-format="electronic">2686-7613</issn><publisher><publisher-name xml:lang="en">Central Research Institute for Epidemiology</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">15837</article-id><article-id pub-id-type="doi">10.36233/0372-9311-364</article-id><article-id pub-id-type="edn">phcmoq</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>SCIENCE AND PRACTICE</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>НАУКА И ПРАКТИКА</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">Production of Bst polymerase for diagnosis of different infections using loop-mediated isothermal amplification</article-title><trans-title-group xml:lang="ru"><trans-title>Получение Bst-полимеразы для диагностики различных инфекций методом петлевой изотермической амплификации</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3279-6811</contrib-id><name-alternatives><name xml:lang="en"><surname>Pika</surname><given-names>Maria I.</given-names></name><name xml:lang="ru"><surname>Пика</surname><given-names>Мария Игоревна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>junior researcher, Research group of genetic engineering and biotechnology</p></bio><bio xml:lang="ru"><p>м.н.с., научная группа генной инженерии и биотехнологии, отдел молекулярной диагностики и эпидемиологии</p></bio><email>cherkashina@pcr.ms</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1721-5134</contrib-id><name-alternatives><name xml:lang="en"><surname>Mikheeva</surname><given-names>Olga O.</given-names></name><name xml:lang="ru"><surname>Михеева</surname><given-names>Ольга Олеговна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>researcher, Research group of genetic engineering and biotechnology</p></bio><bio xml:lang="ru"><p>н.с., научная группа генной инженерии и биотехнологии, отдел молекулярной диагностики и эпидемиологии</p></bio><email>cherkashina@pcr.ms</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0762-0347</contrib-id><name-alternatives><name xml:lang="en"><surname>Solovyova</surname><given-names>Elena D.</given-names></name><name xml:lang="ru"><surname>Соловьева</surname><given-names>Елена Дмитриевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>junior researcher, Research group of genetic engineering and biotechnology</p></bio><bio xml:lang="ru"><p>м.н.с., научная группа генной инженерии и биотехнологии, отдел молекулярной диагностики и эпидемиологии</p></bio><email>cherkashina@pcr.ms</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4592-4755</contrib-id><name-alternatives><name xml:lang="en"><surname>Valdokhina</surname><given-names>Anna V.</given-names></name><name xml:lang="ru"><surname>Валдохина</surname><given-names>Анна Владимировна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>researcher, Research group of genetic engineering and biotechnology</p></bio><bio xml:lang="ru"><p>н.с., научная группа генной инженерии и биотехнологии, отдел молекулярной диагностики и эпидемиологии</p></bio><email>cherkashina@pcr.ms</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7055-1762</contrib-id><name-alternatives><name xml:lang="en"><surname>Bulanenko</surname><given-names>Victoria P.</given-names></name><name xml:lang="ru"><surname>Буланенко</surname><given-names>Виктория Петровна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>researcher, Research group of genetic engineering and biotechnology</p></bio><bio xml:lang="ru"><p>н.с., научная группа генной инженерии и биотехнологии, отдел молекулярной диагностики и эпидемиологии</p></bio><email>cherkashina@pcr.ms</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3627-6047</contrib-id><name-alternatives><name xml:lang="en"><surname>Cherkashin</surname><given-names>Evgeny A.</given-names></name><name xml:lang="ru"><surname>Черкашин</surname><given-names>Евгений Александрович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sci. (Chem.), Head, Center for development, product development and innovation — Deputy head, Production department</p></bio><bio xml:lang="ru"><p>канд. хим. наук, рук. центра разработки, развития продукции и инноваций — ВРИО заведующего научно-производственной лаборатории</p></bio><email>cherkashina@pcr.ms</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3503-2366</contrib-id><name-alternatives><name xml:lang="en"><surname>Petrov</surname><given-names>Vadim V.</given-names></name><name xml:lang="ru"><surname>Петров</surname><given-names>Вадим Викторович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Head, Research group of development of new molecular biological technologies</p></bio><bio xml:lang="ru"><p>рук. научной группы разработки новых молекулярно-биологических технологий, отдел молекулярной диагностики и эпидемиологии</p></bio><email>cherkashina@pcr.ms</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7237-1810</contrib-id><name-alternatives><name xml:lang="en"><surname>Krasovitov</surname><given-names>Kirill V.</given-names></name><name xml:lang="ru"><surname>Красовитов</surname><given-names>Кирилл Владимирович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>technologist-developer, Research group of development of new molecular biological technologies</p></bio><bio xml:lang="ru"><p>технолог-разработчик, научная группа разработки новых молекулярно-биологических технологий, отдел молекулярной диагностики и эпидемиологии</p></bio><email>cherkashina@pcr.ms</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7970-7495</contrib-id><name-alternatives><name xml:lang="en"><surname>Cherkashina</surname><given-names>Anna S.</given-names></name><name xml:lang="ru"><surname>Черкашина</surname><given-names>Анна Сергеевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sci. (Chem.), Head, Research group of genetic engineering and biotechnology</p></bio><bio xml:lang="ru"><p>к.хим.н., рук. научной группы генной инженерии и биотехнологии, отдел молекулярной диагностики и эпидемиологии</p></bio><email>cherkashina@pcr.ms</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4228-9044</contrib-id><name-alternatives><name xml:lang="en"><surname>Akimkin</surname><given-names>Vasily G.</given-names></name><name xml:lang="ru"><surname>Акимкин</surname><given-names>Василий Геннадиевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>D. Sci. (Med.), Professor, Academician of the Russian Academy of Sciences, Director</p></bio><bio xml:lang="ru"><p>д.м.н., проф., академик РАН, член-корреспондент РАМН, директор</p></bio><email>cherkashina@pcr.ms</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Central Research Institute of Epidemiology</institution></aff><aff><institution xml:lang="ru">Центральный научно-исследовательский институт эпидемиологии Роспотребнадзора</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-07-11" publication-format="electronic"><day>11</day><month>07</month><year>2023</year></pub-date><volume>100</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>210</fpage><lpage>218</lpage><history><date date-type="received" iso-8601-date="2023-07-11"><day>11</day><month>07</month><year>2023</year></date><date date-type="accepted" iso-8601-date="2023-07-11"><day>11</day><month>07</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Pika M.I., Mikheeva O.O., Solovyova E.D., Valdokhina A.V., Bulanenko V.P., Cherkashin E.A., Petrov V.V., Krasovitov K.V., Cherkashina A.S., Akimkin V.G.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Пика М.И., Михеева О.О., Соловьева Е.Д., Валдохина А.В., Буланенко В.П., Черкашин Е.А., Петров В.В., Красовитов К.В., Черкашина А.С., Акимкин В.Г.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Pika M.I., Mikheeva O.O., Solovyova E.D., Valdokhina A.V., Bulanenko V.P., Cherkashin E.A., Petrov V.V., Krasovitov K.V., Cherkashina A.S., Akimkin V.G.</copyright-holder><copyright-holder xml:lang="ru">Пика М.И., Михеева О.О., Соловьева Е.Д., Валдохина А.В., Буланенко В.П., Черкашин Е.А., Петров В.В., Красовитов К.В., Черкашина А.С., Акимкин В.Г.</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://microbiol.crie.ru/jour/article/view/15837">https://microbiol.crie.ru/jour/article/view/15837</self-uri><abstract xml:lang="en"><p><bold>Introduction.</bold> The large fragment of DNA polymerase I from <italic>Geobacillus stearothermophilus</italic> GIM1.543 (Bst DNA polymerase) possesses 5'-3' DNA polymerase activity, 5'-3' displacement activity and high processivity. These properties make it possible to use Bst DNA polymerase in loop-mediated isothermal amplification (LAMP), which provides highly specific amplification of the target sequence and is used for rapid detection of agents causing human infectious diseases.</p> <p>The <bold>purpose </bold>of the study was to produce a recombinant Bst polymerase enzyme in the bacterial expression system and to assess its properties for LAMP-based diagnostics of infectious diseases.</p> <p><bold>Materials and methods. </bold>Expression constructs carrying the Bst polymerase gene were obtained using genetic engineering techniques. Different <italic>Escherichia coli</italic> strains were used for protein expression. Metal-chelate and gel filtration chromatography techniques were used for protein purification. Catalytic characteristics of the enzyme were assessed in loop-mediated isothermal amplification reactions using AmpliSens<sup>®</sup> SARS-CoV-2-IT, AmpliSens<sup>®</sup> IAV-IT and AmpliSens<sup>®</sup> IBV-IT diagnostic systems designed for high-quality detection of SARS-CoV-2, influenza A virus (IAV) and influenza B virus (IBV) RNA, respectively.</p> <p><bold>Results. </bold>The offered protocol for production, extraction and purification of recombinant Bst polymerase makes it possible to produce the enzyme in the bacterial expression system using <italic>E. coli</italic> cells in a soluble form and reaching the yield up to 20% of the total cell mass. In LAMP reactions, the obtained enzyme demonstrates activity comparable with that of the commercial enzyme Bst 2.0 (NEB).</p> <p><bold>Conclusion. </bold>Considering the fast purification and production of the enzyme, the obtained recombinant Bst polymerase can be used in LAMP-based diagnostic kits.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Введение.</bold> Большой фрагмент ДНК-полимеразы I из <italic>Geobacillus stearothermophilus</italic> GIM1.543 (ДНК-полимераза Bst) обладает 5'-3'-ДНК-полимеразной активностью, 5'-3'-вытесняющей активностью и высокой процессивностью. Благодаря этим свойствам ДНК-полимераза Bst используется в петлевой изотермической амплификации (LAMP), которая обеспечивает амплификацию целевой последовательности с высокой специфичностью и применяется для быстрого обнаружения возбудителей инфекционных заболеваний человека.</p> <p><bold>Цель </bold>работы — получение рекомбинантного фермента Bst-полимеразы в бактериальной системе экспрессии и оценка его свойств в условиях LAMP для диагностики инфекционных заболеваний.</p> <p><bold>Материалы и методы. </bold>Методами генетической инженерии получали экспрессионные конструкции, несущие ген Bst-полимеразы. Экспрессию белка проводили в различных штаммах клеток <italic>Escherichia coli</italic>. Для получения очищенных препаратов белка использовали методы металл-хелатной и гель-фильтрационной хроматографии. Оценку каталитических свойств фермента проводили в реакциях петлевой изотермической амплификации в диагностических системах «АмплиСенс<sup>®</sup> SARS-CoV-2-IT», «АмплиСенс<sup>®</sup> IAV-IT» и «АмплиСенс<sup>®</sup> IBV-IT», предназначенных для качественного определения РНК SARS-CoV-2, вируса гриппа А (IAV) и вируса гриппа B (IBV) соответственно.</p> <p><bold>Результаты. </bold>Разработанный протокол наработки, выделения и очистки рекомбинантной Bst-полимеразы позволяет получать фермент в бактериальной системе экспрессии на основе клеток <italic>E. coli</italic> в растворимой форме с выходом до 20% от собранной клеточной массы. В реакциях LAMР полученный фермент демонстрирует активность, сопоставимую с коммерческим ферментом Bst 2.0 («NEB»).</p> <p><bold>Заключение. </bold>Полученная рекомбинантная Bst-полимераза, учитывая быстрый способ очистки и получения фермента, пригодна для применения в диагностических наборах на основе LAMP.</p></trans-abstract><kwd-group xml:lang="en"><kwd>polymerase</kwd><kwd>isothermal amplification</kwd><kwd>recombinant enzyme</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>полимераза</kwd><kwd>изотермическая амплификация</kwd><kwd>рекомбинантный фермент</kwd></kwd-group><funding-group><funding-statement xml:lang="en">Тhe research was funded by the State budget (Federal project "Sanitary shield of the country — safety for health (prevention, detection, response)”).</funding-statement><funding-statement xml:lang="ru">Исследование выполнено за счёт государственного бюджета (федеральный проект «Санитарный щит страны — безопасность для здоровья (предупреждение, выявление, реагирование)»).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Notomi T., Okayama H., Masubuchi H., et al. 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