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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">zhps</journal-id><journal-title-group><journal-title xml:lang="ru">Журнал прикладной спектроскопии</journal-title><trans-title-group xml:lang="en"><trans-title>Zhurnal Prikladnoii Spektroskopii</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0514-7506</issn><publisher><publisher-name>B. I. Stepanov Institute of Physics of the National Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.47612/0514-7506-2021-88-6-942-947</article-id><article-id custom-type="elpub" pub-id-type="custom">zhps-943</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>Статьи</subject></subj-group></article-categories><title-group><article-title>Сравнительное исследование спектральных характеристик комплексов Hoechst 33258 и метиленового синего с бычьим сывороточным альбумином</article-title><trans-title-group xml:lang="en"><trans-title>Comparative study of spectral characteristics of complexes of Hoechst 33258 and methylene blue with bovine serum albumin</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Антонян</surname><given-names>А. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Antonyan</surname><given-names>A. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ереван</p></bio><bio xml:lang="en"><p>Yerevan</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Петросян</surname><given-names>Н. Р.</given-names></name><name name-style="western" xml:lang="en"><surname>Petrosyan</surname><given-names>N. H.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ереван</p></bio><bio xml:lang="en"><p>Yerevan</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Вардеванян</surname><given-names>П. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Vardevanyan</surname><given-names>P. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ереван</p></bio><bio xml:lang="en"><p>Yerevan</p></bio><email xlink:type="simple">p.vardevanyan@ysu.am</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Ереванский государственный университет</institution></aff><aff xml:lang="en"><institution>Yerevan State University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>29</day><month>11</month><year>2021</year></pub-date><volume>88</volume><issue>6</issue><fpage>942</fpage><lpage>947</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Антонян А.П., Петросян Н.Р., Вардеванян П.О., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Антонян А.П., Петросян Н.Р., Вардеванян П.О.</copyright-holder><copyright-holder xml:lang="en">Antonyan A.P., Petrosyan N.H., Vardevanyan P.O.</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://zhps.ejournal.by/jour/article/view/943">https://zhps.ejournal.by/jour/article/view/943</self-uri><abstract><p>Проведено сравнительное исследование взаимодействия бисбензимидазольного соединения Hoechst 33258 и тиазинового красителя метиленового синего (МС) с бычьим сывороточным альбумином крови (БСА) спектроскопическими методами. Получены кривые денатурации, а также спектры поглощения и дифференциальные спектры поглощения комплексов протеин-лиганд. Показано, что температура денатурации комплексов БСА с Hoechst 33258 уменьшается с увеличением концентрационного соотношения лиганд/белок, в то время как в случае МС, наоборот, увеличивается. Выявлены изменения спектров и дифференциальных спектров поглощения комплексов обоих лигандов с БСА, обусловленные связыванием этих специфических лигандов с белком. Предполагается, что при взаимодействии Hoechst 33258 с БСА происходит некоторое разрыхление компактной структуры белка в результате частичной потери спиральности a-структур, в то время как в случае МС степень упакованности пространственной структуры белка увеличивается. </p></abstract><trans-abstract xml:lang="en"><p>The comparative study on interaction of bisbenzimidazole compound Hoechst 33258 and thiazine dye methylene blue (MB) with bovine serum albumin (BSA) was carried out by spectroscopic methods. Denaturation curves as well as absorption spectra and differential absorption spectra of protein-ligand complexes were obtained. Denaturation temperature of albumin complexes of BSA with Hoechst 33258 was shown to decrease with the growth of concentration ratio of ligand/protein, while for MB, vice versa, denaturation temperature increases. Changes in absorption spectra and differential absorption spectra of the complexes of ligands with albumin were revealed, which result from the binding of these DNA-specific ligands to protein. It is supposed that at the interaction of Hoechst 33258 with BSA some loosening of protein compact structure occurs due to the partial loss of helicity of a-structures, while for MB an increase of the protein compact structure takes place. </p></trans-abstract><kwd-group xml:lang="ru"><kwd>бычий сывороточный альбумин</kwd><kwd>Hoechst 33258</kwd><kwd>метиленовый синий</kwd><kwd>кривая денатурации</kwd><kwd>спектр поглощения</kwd><kwd>дифференциальный спектр поглощения</kwd></kwd-group><kwd-group xml:lang="en"><kwd>bovine serum albumin</kwd><kwd>Hoechst 33258</kwd><kwd>methylene blue</kwd><kwd>denaturation curves</kwd><kwd>absorption spectrum</kwd><kwd>differential absorption spectrum</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено при финансовой поддержке комитета по науке Республики Армения в рамках научного проекта № 21T-1F063.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">V. 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