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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">10540</article-id><article-id pub-id-type="doi">10.32607/20758251-2014-6-3-76-88</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">Study of the Structure-Function-Stability Relationships in Yeast D-amino Acid Oxidase: Hydrophobization of Alpha-Helices</article-title><trans-title-group xml:lang="ru"><trans-title>Исследование взаимосвязи структура-функция-стабильность в дрожжевой оксидазе D-аминокислот: гидрофобизация альфа-спиралей</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Golubev</surname><given-names>I. V.</given-names></name><name xml:lang="ru"><surname>Голубев</surname><given-names>И. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>vitishkov@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>Komarova</surname><given-names>N. V.</given-names></name><name xml:lang="ru"><surname>Комарова</surname><given-names>Н. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>vitishkov@gmail.com</email><xref ref-type="aff" rid="aff2"/><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ryzhenkova</surname><given-names>K. V.</given-names></name><name xml:lang="ru"><surname>Рыженкова</surname><given-names>К. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>vitishkov@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>T. A.</given-names></name><name xml:lang="ru"><surname>Чубарь</surname><given-names>Т. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>vitishkov@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>S. S.</given-names></name><name xml:lang="ru"><surname>Савин</surname><given-names>С. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>vitishkov@gmail.com</email><xref ref-type="aff" rid="aff2"/><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tishkov</surname><given-names>V. I.</given-names></name><name xml:lang="ru"><surname>Тишков</surname><given-names>В. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>vitishkov@gmail.com</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/><xref ref-type="aff" rid="aff3"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">M.V. Lomonosov Moscow State University</institution></aff><aff><institution xml:lang="ru">Московский государственный университет им. М.В. Ломоносова</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Innovations and High Technologies MSU Ltd</institution></aff><aff><institution xml:lang="ru">ООО «Инновации и высокие технологии МГУ»</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">A.N. Bach Institute of Biochemistry</institution></aff><aff><institution xml:lang="ru">Институт биохимии им. А.Н. Баха РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2014-09-15" publication-format="electronic"><day>15</day><month>09</month><year>2014</year></pub-date><volume>6</volume><issue>3</issue><issue-title xml:lang="en">VOL 6, NO3 (2014)</issue-title><issue-title xml:lang="ru">ТОМ 6, №3 (2014)</issue-title><fpage>76</fpage><lpage>88</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 ©; 2014, Golubev I.V., Komarova N.V., Ryzhenkova K.V., Chubar T.A., Savin S.S., Tishkov V.I.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2014, Голубев И.В., Комарова Н.В., Рыженкова К.В., Чубарь Т.А., Савин С.С., Тишков В.И.</copyright-statement><copyright-year>2014</copyright-year><copyright-holder xml:lang="en">Golubev I.V., Komarova N.V., Ryzhenkova K.V., Chubar T.A., Savin S.S., Tishkov V.I.</copyright-holder><copyright-holder xml:lang="ru">Голубев И.В., Комарова Н.В., Рыженкова К.В., Чубарь Т.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/10540">https://actanaturae.ru/2075-8251/article/view/10540</self-uri><abstract xml:lang="en"><p>Hydrophobization of alpha-helices is one of the general approaches used for improving the thermal stability of enzymes. A total of 11 serine residues located in alpha-helices have been found based on multiple alignments of the amino acid sequences of D-amino acid oxidases from different organisms and the analysis of the 3D-structure of D-amino acid oxidase from yeast Trigonopsis variabilis (TvDAAO, EC 1.4.3.3). As a result of further structural analysis, eight Ser residues in 67, 77, 78, 105, 270, 277, 335, and 336 positions have been selected to be substituted with Ala. S78A and S270A substitutions have resulted in dramatic destabilization of the enzyme. Mutant enzymes were inactivated during isolation from cells. Another six mutant TvDAAOs have been highly purified and their properties have been characterized. The amino acid substitutions S277A and S336A destabilized the protein globule. The thermal stabilities of TvDAAO S77A and TvDAAO S335A mutants were close to that of the wild-type enzyme, while S67A and S105A substitutions resulted in approximately 1.5- and 2.0-fold increases in the TvDAAO mutant thermal stability, respectively. Furthermore, the TvDAAO S105A mutant showed on average a 1.2- to 3.0-fold higher catalytic efficiency with D-Asn, D-Tyr, D-Phe, and D-Leu as compared to the wild-type enzyme.</p></abstract><trans-abstract xml:lang="ru"><p>Гидрофобизация α-спиралей является одним из общих подходов повышения температурной стабильности ферментов. На основании сравнительного анализа аминокислотных последовательностей оксидаз D-аминокислот из различных источников и анализа трехмерной структуры оксидазы D-аминокислот из дрожжей Trigonopsis variabilis (TvDAAO, [КФ 1.4.3.3]) найдены 11 остатков Ser, расположенных в α-спиралях. По результатам дальнейшего структурного анализа восемь из них отобрали (в положениях 67, 77, 78, 105, 270, 277, 335 и 336) для замены на остатки Ala. Замены Ser78Ala и Ser270Ala привели к сильной дестабилизации фермента - мутантные варианты инактивировались в процессе их выделения из клеток. Остальные шесть мутантных TvDAAO были получены в высокоочищенном состоянии и изучены их свойства. Замены Ser277Ala и Ser336Ala привели к дестабилизации белковой глобулы, мутанты TvDAAO Ser77Ala и TvDAAO Ser335Ala по термостабильности были близки к ферменту дикого типа, в то время как замены Ser67Ala и Ser105Ala повысили температурную стабильность приблизительно в 1.5 и 2 раза. Кроме того, каталитическая эффективность мутантной TvDAAO Ser105Ala с D-Asn, D-Tyr, D-Phe и D-Leu была в среднем в 1.2-3 раза выше, чем у фермента дикого типа.</p></trans-abstract><kwd-group xml:lang="en"><kwd>D-amino acid oxidase from yeast Trigonopsis variabilis</kwd><kwd>protein engineering</kwd><kwd>hydrophobization of alpha-helices</kwd><kwd>ite-directed mutagenesis</kwd><kwd>ubstrate specificity</kwd><kwd>hermal stability</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>белковая инженерия</kwd><kwd>гидрофобизация α-спирали</kwd><kwd>направленный мутагенез</kwd><kwd>оксидаза D-аминокислот из Trigonopsis variabilis</kwd><kwd>субстратная специфичность</kwd><kwd>температурная стабильность</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was supported by the Russian Foundation for Basic Research (grant № 14-04-00859-a).</funding-statement><funding-statement xml:lang="ru">Работа поддержана РФФИ (грант № 14-04-00859-а).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>[1] Tishkov V.I., Khoronenkova S. 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