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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">Applied Biochemistry and Microbiology</journal-id><journal-title-group><journal-title xml:lang="en">Applied Biochemistry and Microbiology</journal-title><trans-title-group xml:lang="ru"><trans-title>Прикладная биохимия и микробиология</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0555-1099</issn><issn publication-format="electronic">3034-574X</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">689356</article-id><article-id pub-id-type="doi">10.31857/S0555109925030089</article-id><article-id pub-id-type="edn">DRVMWC</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">Effect of brucellin conjugated with gold nanoparticles on the immune response and phagocytosis of brucella</article-title><trans-title-group xml:lang="ru"><trans-title>Влияние конъюгата бруцеллина с наночастицами золота на иммунный ответ и фагоцитоз бруцелл</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Dykman</surname><given-names>L. A.</given-names></name><name xml:lang="ru"><surname>Дыкман</surname><given-names>Л. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>dykman_l@ibppm.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Staroverov</surname><given-names>S. A.</given-names></name><name xml:lang="ru"><surname>Староверов</surname><given-names>С. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>dykman_l@ibppm.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Vyrshchikov</surname><given-names>R. D.</given-names></name><name xml:lang="ru"><surname>Вырщиков</surname><given-names>Р. Д.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>dykman_l@ibppm.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Biochemistry and Physiology of Plants and Microorganisms — Research Institution Saratov Federal Scientific Centre of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт биохимии и физиологии растений и микроорганизмов — обособленное структурное подразделение Федерального государственного бюджетного учреждения науки Федерального исследовательского центра “Саратовский научный центр Российской академии наук”</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-09-04" publication-format="electronic"><day>04</day><month>09</month><year>2025</year></pub-date><volume>61</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>303</fpage><lpage>311</lpage><history><date date-type="received" iso-8601-date="2025-08-16"><day>16</day><month>08</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-08-16"><day>16</day><month>08</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://cardiosomatics.ru/0555-1099/article/view/689356">https://cardiosomatics.ru/0555-1099/article/view/689356</self-uri><abstract xml:lang="en"><p>A conjugate of 15-nm gold nanoparticles with brucellin, a polysaccharide-protein complex isolated from the <italic>Brucella</italic> vaccine strain, was obtained. The obtained conjugate was used to vaccinate white mice. The drug was administered intraperitoneally three times with an interval of 7 days. After that, all animals were injected with a suspension of cells of the <italic>Brucella abortus</italic> 82 vaccine strain. Using a cell proliferative test, it was shown that in the group of animals immunized with a brucellin conjugate with gold nanoparticles, phagocytic cells and splenocytes had higher metabolic activity compared to the group immunized with the native antigen. Moreover, this trend was enhanced after the introduction of the vaccine strain. The highest antibody titer was observed in animals immunized with a brucellin conjugate with gold nanoparticles (1 : 2560 initially and 1 : 10240 after stimulation with the vaccine strain). It is important that during the opsonophagocytic reaction, the level of opsonizing antibodies was very high, which helped neutralize bacteria persisting in the animals.</p></abstract><trans-abstract xml:lang="ru"><p>Получен конъюгат наночастиц золота (15 нм) с бруцеллином — полисахаридно-белковым комплексом, выделенным из вакцинного штамма бруцелл. Полученным конъюгатом проводили вакцинацию белых мышей. Препарат вводили внутрибрюшинно трехкратно с интервалом в 7 дней. После чего всем животным инъецировали суспензию клеток вакцинного штамма <italic>Brucella abortus</italic> 82. С использованием клеточного пролиферативного теста показано, что в группе животных, иммунизированных конъюгатом бруцеллина с наночастицами золота, фагоцитирующие клетки и спленоциты обладали более высокой метаболической активностью по сравнению с группой, иммунизированной нативным антигеном. Причем эта тенденция усиливалась после введения вакцинного штамма. Наиболее высокий титр антител был у животных, иммунизированных конъюгатом бруцеллина с наночастицами золота (1 : 2560 исходно и 1 : 10240 после стимуляции вакцинным штаммом). Важно, что при проведении опсонофагоцитарной реакции оказался весьма высоким уровень опсонизирующих антител, которые способствуют нейтрализации персистирующих в организме животных бактерий.</p></trans-abstract><kwd-group xml:lang="en"><kwd>gold nanoparticles</kwd><kwd>brucellin</kwd><kwd>immunization</kwd><kwd>antibodies</kwd><kwd>proliferative activity</kwd><kwd>opsonophagocytic reaction</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>наночастицы золота</kwd><kwd>бруцеллин</kwd><kwd>иммунизация</kwd><kwd>антитела</kwd><kwd>пролиферативная активность</kwd><kwd>опсонофагоцитарная реакция</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Министерство науки и высшего образования Российской Федерации</institution></institution-wrap><institution-wrap><institution xml:lang="en">Ministry of Science and Higher Education of the Russian Federation</institution></institution-wrap></funding-source><award-id>075-03-2024-488</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Бухарин О.В. // Вестник Московского университета. 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