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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">11812</article-id><article-id pub-id-type="doi">10.32607/actanaturae.11812</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">Bioinformatics-Structural Approach to the Search for New D-Amino Acid Oxidases</article-title><trans-title-group xml:lang="ru"><trans-title>Биоинформационно-структурный подход к поиску новых оксидаз D-аминокислот</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Atroshenko</surname><given-names>Denis L.</given-names></name><name xml:lang="ru"><surname>Атрошенко</surname><given-names>Денис Леонидович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>atrdenis@gmail.com</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Golovina</surname><given-names>Diana I.</given-names></name><name xml:lang="ru"><surname>Головина</surname><given-names>Диана Игоревна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>golovina.dii@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sergeev</surname><given-names>Egor P.</given-names></name><name xml:lang="ru"><surname>Сергеев</surname><given-names>Егор Петрович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>egor.sergeev@chemistry.msu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shelomov</surname><given-names>Michail D.</given-names></name><name xml:lang="ru"><surname>Шеломов</surname><given-names>Михаил Дмитриевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>mikhail_shelomov@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Elcheninov</surname><given-names>Alexander G.</given-names></name><name xml:lang="ru"><surname>Ельченинов</surname><given-names>Александр Геннадьевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>elcheninov.ag@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kublanov</surname><given-names>Ilya V.</given-names></name><name xml:lang="ru"><surname>Кубланов</surname><given-names>Илья Валерьевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kublanov.ilya@gmail.com</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Chubar</surname><given-names>Tatyana A.</given-names></name><name xml:lang="ru"><surname>Чубарь</surname><given-names>Татьяна Анатольевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>tchubar@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Pometun</surname><given-names>Anastaiya A.</given-names></name><name xml:lang="ru"><surname>Пометун</surname><given-names>Анастасия Александровна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>aapometun@gmail.com</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Savin</surname><given-names>Svyatoslav S.</given-names></name><name xml:lang="ru"><surname>Савин</surname><given-names>Святослав Сергеевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>savinslava@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6997-7229</contrib-id><name-alternatives><name xml:lang="en"><surname>Tishkov</surname><given-names>Vladimir I.</given-names></name><name xml:lang="ru"><surname>Тишков</surname><given-names>Владимир Иванович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Distinguished Teacher of Russian Federation, Distinguished Professor, Professor of Biochemistry, Doctor of Sciences, Ph.D., Professor at the Department of Chemical Enzymology, Chemistry Faculty</p></bio><bio xml:lang="ru"><p>почетный работник сферы образования РФ, заслуженный профессор, профессор, доктор химический наук, профессор кафедры химической энзимологии химического факультета, зав. лабораторией молекулярной инженерии</p></bio><email>vitishkov@gmail.com</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Department of Chemistry, Lomonosov Moscow State University</institution></aff><aff><institution xml:lang="ru">Московский государственный университет имени М.В. Ломоносова, химический факультет</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Federal Research Centre “Fundamentals of Biotechnology” of RAS</institution></aff><aff><institution xml:lang="ru">Федеральный исследовательский центр «Фундаментальные основы биотехнологии» РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2022-12-26" publication-format="electronic"><day>26</day><month>12</month><year>2022</year></pub-date><volume>14</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>57</fpage><lpage>68</lpage><history><date date-type="received" iso-8601-date="2022-09-27"><day>27</day><month>09</month><year>2022</year></date><date date-type="accepted" iso-8601-date="2022-10-21"><day>21</day><month>10</month><year>2022</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Atroshenko D.L., Golovina D.I., Sergeev E.P., Shelonmov M., Elcheninov A.G., Kublanov I.V., Chubar T.A., Pometun A.A., Savin S.S., Tishkov V.I.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Атрошенко Д.Л., Головина Д.И., Сергеев Е.П., Шеломов М.Д., Ельченинов А.Г., Кубланов И.В., Чубарь Т.А., Пометун А.А., Савин С.С., Тишков В.И.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Atroshenko D.L., Golovina D.I., Sergeev E.P., Shelonmov M., Elcheninov A.G., Kublanov I.V., Chubar T.A., Pometun A.A., Savin S.S., Tishkov V.I.</copyright-holder><copyright-holder xml:lang="ru">Атрошенко Д.Л., Головина Д.И., Сергеев Е.П., Шеломов М.Д., Ельченинов А.Г., Кубланов И.В., Чубарь Т.А., Пометун А.А., Савин С.С., Тишков В.И.</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/11812">https://actanaturae.ru/2075-8251/article/view/11812</self-uri><abstract xml:lang="en"><p>D-amino acid oxidase (DAAO, EC 1.2.1.2) plays an important role in the functioning of prokaryotes as well as of lower (yeast and fungi) and higher eukaryotes (mammals). DAAO genes have not yet been found in archaean genomes. D-amino acid oxidase is increasingly used in various fields, which requires the development of new variants of the enzyme with specific properties. However, even within one related group (bacteria, yeasts and fungi, mammals), DAAOs show very low homology between amino acid sequences. In particular, this fact is clearly observed in the case of DAAO from bacteria. The high variability in the primary structures of DAAO severely limits the search for new enzymes in known genomes. As a result, many (if not most) DAAO genes remain either unannotated or incorrectly annotated. We propose an approach that uses bioinformatic methods in combination with general 3D structure and active center structure analysis to confirm that the gene found encodes D-amino acid oxidase and to predict the possible type of its substrate specificity. Using a homology search, we obtained a set of candidate sequences, modelled the tertiary structure of the selected enzymes, and compared them with experimental and model structures of known DAAOs. The effectiveness of the proposed approach for discrimination of DAAOs and glycine oxidases is shown. Using this approach, new DAAO genes were found in the genomes of six strains of extremophilic bacteria, and for the first time in the world, one gene was identified in the genome of halophilic archaea. Preliminary experiments confirmed the predicted specificity of DAAO from <italic>Natronosporangium hydrolyticum</italic> ACPA39 with D-Leu and D-Phe.</p></abstract><trans-abstract xml:lang="ru"><p>Оксидаза D-аминокислот (DAAO, КФ 1.4.3.3) играет важную роль в жизни и прокариот, и эукариот – как низших (дрожжи и грибы), так и высших (млекопитающие). В геномах архей гены DAAO пока не найдены. При этом даже внутри одной группы организмов (бактерии, дрожжи и грибы, млекопитающие) DAAO характеризуются очень низкой гомологией аминокислотных последовательностей. Особенно это выражено у бактериальных DAAO. Высокая вариабельность первичных структур DAAO сильно ограничивает поиск генов новых ферментов в известных геномах. В результате многие гены DAAO (если не большинство) остаются или неаннотированными, или неправильно аннотированными. Нами предложен подход, в котором биоинформатические методы в сочетании с анализом общей структуры и структуры активного центра используются для подтверждения того, что найденный ген кодирует именно оксидазу D-аминокислот и предсказания возможного типа ее субстратной специфичности. С помощью поиска по гомологии получают набор кандидатных последовательностей, проводят моделирование третичной структуры отобранных ферментов и сравнивают их с экспериментальными и модельными структурами известных DAAO. Показана эффективность предложенного подхода для дискриминации DAAO и глициноксидаз. С использованием этого подхода в шести штаммах экстремофильных бактерий найдены гены новых DAAO, и впервые в мире один ген идентифицирован в геноме галофильных архей. Предварительные эксперименты подтвердили предсказанную специфичность DAAO из <italic>Natronosporangium hy</italic><italic>d</italic><italic>rolyticum</italic> ACPA39 в отношении D-Leu и D-Phe.</p></trans-abstract><kwd-group xml:lang="en"><kwd>D-amino acid oxidase</kwd><kwd>primary structure</kwd><kwd>ternary structure</kwd><kwd>modelling</kwd><kwd>AlphaFold 2</kwd><kwd>glycine oxidases</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>оксидаза D-аминокислот</kwd><kwd>первичная структура</kwd><kwd>третичная структура</kwd><kwd>моделирование</kwd><kwd>AlphaFold 2</kwd><kwd>глициноксидаза</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский фонд фундаментальных исследований</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Foundation for Basic Research</institution></institution-wrap></funding-source><award-id>21-34-70040 мол_а_мос</award-id></award-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Министерство науки и высшего образования РФ</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>075-15-2021-1396</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Tishkov V.I., Khoronenkova S.V. // Biochemistry (Moscow). 2005. 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