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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">Acta Naturae</journal-id><journal-title-group><journal-title xml:lang="en">Acta Naturae</journal-title><trans-title-group xml:lang="ru"><trans-title>Acta Naturae</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2075-8251</issn><publisher><publisher-name xml:lang="en">Acta Naturae Ltd</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">10648</article-id><article-id pub-id-type="doi">10.32607/20758251-2012-4-2-80-86</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Research Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Экспериментальные 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">Construction of a Full-Atomic Mechanistic Model of Human Apurinic/Apyrimidinic Endonuclease APE1 for Virtual Screening of Novel Inhibitors</article-title><trans-title-group xml:lang="ru"><trans-title>Построение механистической полноатомной модели апуриновой/апиримидиновой эндонуклеазы человека APE1 для виртуального скрининга новых ингибиторов</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Khaliullin</surname><given-names>I. G.</given-names></name><name xml:lang="ru"><surname>Халиуллин</surname><given-names>И. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>vytas@belozersky.msu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nilov</surname><given-names>D. K.</given-names></name><name xml:lang="ru"><surname>Нилов</surname><given-names>Д. K.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>vytas@belozersky.msu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shapovalova</surname><given-names>I. V.</given-names></name><name xml:lang="ru"><surname>Шаповалова</surname><given-names>И. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>vytas@belozersky.msu.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Švedas</surname><given-names>V. K.</given-names></name><name xml:lang="ru"><surname>Швядас</surname><given-names>В. K.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>vytas@belozersky.msu.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Belozersky Institute of Physicochemical Biology, Lomonosov Moscow State University</institution></aff><aff><institution xml:lang="ru">Научно-исследовательский институт физико-химической биологии им. А.Н. Белозерского Московского государственного университета им. М.В. Ломоносова</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Lomonosov Moscow State University</institution></aff><aff><institution xml:lang="ru">Московский государственный университет им. М.В. Ломоносова</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2012-06-15" publication-format="electronic"><day>15</day><month>06</month><year>2012</year></pub-date><volume>4</volume><issue>2</issue><issue-title xml:lang="en">VOL 4, NO2 (2012)</issue-title><issue-title xml:lang="ru">ТОМ 4, №2 (2012)</issue-title><fpage>80</fpage><lpage>86</lpage><history><date date-type="received" iso-8601-date="2020-01-17"><day>17</day><month>01</month><year>2020</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2012, Khaliullin I.G., Nilov D.K., Shapovalova I.V., Švedas V.K.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2012, Халиуллин И.Г., Нилов Д.K., Шаповалова И.В., Швядас В.K.</copyright-statement><copyright-year>2012</copyright-year><copyright-holder xml:lang="en">Khaliullin I.G., Nilov D.K., Shapovalova I.V., Švedas V.K.</copyright-holder><copyright-holder xml:lang="ru">Халиуллин И.Г., Нилов Д.K., Шаповалова И.В., Швядас В.K.</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://actanaturae.ru/2075-8251/article/view/10648">https://actanaturae.ru/2075-8251/article/view/10648</self-uri><abstract xml:lang="en"><p>A full-atomic molecular model of human apurinic/apyrimidinic endonuclease APE1, an important enzyme in the DNA repair system, has been constructed. The research consisted of hybrid quantum mechanics/ molecular mechanics modeling of the enzyme-substrate interactions, as well as calculations of the ionization states of the amino acid residues of the active site of the enzyme. The choice of the APE1 mechanism with an Asp210 residue as a proton acceptor was validated by means of a generalization of modeling and experimental data. Interactions were revealed in the active site that are of greatest significance for binding the substrate and potential APE1 inhibitors (potential co-drugs of interest in the chemo- and radiotherapy of oncological diseases).</p></abstract><trans-abstract xml:lang="ru"><p>Создана полноатомная молекулярная модель апуриновой/апиримидиновой эндонуклеазы 1 (APE1) человека - одного из ключевых ферментов системы репарации ДНК. Исследование включало в себя гибридное квантово-механическое/молекулярно-механическое моделирование фермент-субстратных взаимодействий и расчет ионизационных состояний аминокислотных остатков активного центра фермента. В результате обобщения расчетных и экспериментальных данных обоснован выбор механизма действия APE1 с остатком Asp210 в качестве акцептора протона. Выявлены взаимодействия в активном центре, наиболее важные для связывания субстрата и потенциальных ингибиторов APE1, представляющих интерес в качестве перспективных сопровождающих препаратов в химио- и радиотерапии онкологических заболеваний.</p></trans-abstract><kwd-group xml:lang="en"><kwd>apurinic/apyrimidinic endonuclease</kwd><kwd>QM/MM</kwd><kwd>enzymatic mechanism</kwd><kwd>molecular modeling</kwd><kwd>inhibition</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>апуриновая/апиримидиновая эндонуклеаза 1</kwd><kwd>КМ/ММ</kwd><kwd>механизм действия</kwd><kwd>молекулярное моделирование</kwd><kwd>ингибирование</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was financially supported by the Ministry of Education and Science of Russia (State Contract No. 16.512.11.2240).</funding-statement><funding-statement xml:lang="ru">Работа выполнена при финансовой поддержке Министерства образования и науки России (Государственный контракт № 16.512.11.2240).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Lindahl T., Wood R.D. // Science. 1999. 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