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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">Doklady Biological Sciences</journal-id><journal-title-group><journal-title xml:lang="en">Doklady Biological Sciences</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Российской академии наук. Науки о жизни</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2686-7389</issn><issn publication-format="electronic">3034-5057</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">684062</article-id><article-id pub-id-type="doi">10.31857/S2686738925020148</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>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 an anchor bispecific nanoantibody to improve the efficiency of antigen immobilization and detection in a well of a polystyrene plate</article-title><trans-title-group xml:lang="ru"><trans-title>Разработка якорного биспецифичного наноантитела для повышения эффективности иммобилизации и детекции антигена в лунке полистирольного планшета</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tillib</surname><given-names>S. V.</given-names></name><name xml:lang="ru"><surname>Тиллиб</surname><given-names>С. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>sergei.tillib@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Panasyuk</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Панасюк</surname><given-names>М. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>sergei.tillib@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Goryainova</surname><given-names>O. S.</given-names></name><name xml:lang="ru"><surname>Горяйнова</surname><given-names>О. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>sergei.tillib@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ivanova</surname><given-names>T. I.</given-names></name><name xml:lang="ru"><surname>Иванова</surname><given-names>Т. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>sergei.tillib@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Gene Biology, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Федеральное государственное бюджетное учреждение науки Институт биологии гена Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-04-15" publication-format="electronic"><day>15</day><month>04</month><year>2025</year></pub-date><volume>521</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>246</fpage><lpage>252</lpage><history><date date-type="received" iso-8601-date="2025-06-12"><day>12</day><month>06</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-06-12"><day>12</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/2686-7389/article/view/684062">https://journals.eco-vector.com/2686-7389/article/view/684062</self-uri><abstract xml:lang="en"><p>Immunoassay (IA) methods performed in the wells of a polystyrene microplate are the basis of diagnostic studies. In the “sandwich” IA, a fundamentally important initial stage is the immobilization of anchor antibodies in the well of the plate, designed for specific binding of a given antigen from a biological fluid. One of the very promising options for antigen-recognizing molecules are single-domain antibodies (nanoantibodies, Nb). The use of Nbs as anchor antibodies is hampered by their low efficiency of functioning after passive adsorption in the well of the plate. The development of a new format and immobilization method in the case of NT are fundamentally important for overcoming this problem. This work describes the development of a new format of an anchor bispecific nanoantibody (anchor-Nb) to improve the efficiency of both passive adsorption of anchor--NT and subsequent stages of immobilization and detection of the target antigen in the well of a polystyrene plate.</p></abstract><trans-abstract xml:lang="ru"><p>Методы иммуноанализа (ИА), проводимые в лунках полистирольного микропланшета, являются основой диагностических исследований. В “сэндвич”-ИА принципиально важным начальным этапом является иммобилизация в лунке планшета якорных антител, предназначенных для специфического связывания заданного антигена из биологической жидкости. Одним из очень перспективных вариантов антиген-узнающих молекул являются однодоменные антитела (наноантитела, НТ). Использование НТ в качестве якорных антител затруднено их низкой эффективностью функционирования после пассивной адсорбции в лунке планшета. Разработка нового формата и способа иммобилизации в случае НТ принципиально важны для преодоления этой проблемы. Данная работа описывает разработку нового формата якорного биспецифичного наноантитела (як-НТ) для повышения эффективности, как пассивной адсорбции як-НТ, так и последующих этапов иммобилизации и детекции целевого антигена в лунке полистирольного планшета.</p></trans-abstract><kwd-group xml:lang="en"><kwd>single domain antibody</kwd><kwd>nanobody</kwd><kwd>nanoantibody</kwd><kwd>bispecific antibody</kwd><kwd>immunoassay</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>однодоменное антитело</kwd><kwd>нанотело</kwd><kwd>наноантитело</kwd><kwd>биспецифичное антитело</kwd><kwd>иммуноанализ</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский научный фонд</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Science Foundation</institution></institution-wrap></funding-source><award-id>20-14-00305-П</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Crowther J.R. 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