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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">10300</article-id><article-id pub-id-type="doi">10.32607/20758251-2019-11-1-23-28</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">Isolation, Purification and Characterization of L,D-transpeptidase 2 from Mycobacterium tuberculosis</article-title><trans-title-group xml:lang="ru"><trans-title>Выделение, очистка и характеристика L,D-транспептидазы 2 Mycobacterium tuberculosis</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Baldin</surname><given-names>S. M.</given-names></name><name xml:lang="ru"><surname>Балдин</surname><given-names>С. M.</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>Shcherbakova</surname><given-names>T. A.</given-names></name><name xml:lang="ru"><surname>Щербакова</surname><given-names>T. A.</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">Lomonosov Moscow State University</institution></aff><aff><institution xml:lang="ru">Московский государственный университет им. М.В. Ломоносова, НИИ физико-химической биологии им. А.Н. Белозерского</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="2019-03-15" publication-format="electronic"><day>15</day><month>03</month><year>2019</year></pub-date><volume>11</volume><issue>1</issue><issue-title xml:lang="en">VOL 11, NO1 (2019)</issue-title><issue-title xml:lang="ru">ТОМ 11, №1 (2019)</issue-title><fpage>23</fpage><lpage>28</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 ©; 2019, Baldin S.M., Shcherbakova T.A., Švedas V.K.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Балдин С.M., Щербакова T.A., Швядас В.K.</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">Baldin S.M., Shcherbakova T.A., Švedas V.K.</copyright-holder><copyright-holder xml:lang="ru">Балдин С.M., Щербакова T.A., 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/10300">https://actanaturae.ru/2075-8251/article/view/10300</self-uri><abstract xml:lang="en"><p>L,D-transpeptidase 2 from Mycobacterium tuberculosis plays a key role in the formation of nonclassical 3-3 peptidoglycan cross-links in a pathogen’s cell wall making it resistant to a broad range of penicillin antibiotics. The conditions of cultivation, isolation, and purification of recombinant L,D-transpeptidase 2 from M. tuberculosis have been optimized in this study. Oxidation of the free SH groups of catalytic cysteine Cys354 is an important factor causing the inactivation of the enzyme, which occurs during both the expression and storage of enzyme preparations. The biochemical characteristics of purified L,D-transpeptidase 2 and L,D-transpeptidase 2 lacking domain A were determined; the kinetic constants of enzyme-catalyzed nitrocefin transformation were evaluated.</p></abstract><trans-abstract xml:lang="ru"><p>L,D-транспептидаза типа 2 Mycobacterium tuberculosis играет ключевую роль в формировании неклассических 3-3-поперечных сшивок пептидогликана в клеточной стенке патогена, обуславливая его устойчивость к широкому спектру антибиотиков пенициллинового ряда. Нами оптимизированы условия экспрессии, выделения и очистки рекомбинантной L,D-транспептидазы 2 из M. tuberculosis. Важным фактором, вызывающим инактивацию фермента, является окисление SH-групп каталитического остатка цисте ина Cys354 как в процессе экспрессии, так и при хранении препарата. Определены биохимические свойства очищенной L,D-транспептидазы 2 - как полной, так и без домена А, а также кинетические характеристики катализируемой ферментом реакции превращения нитроцефина.</p></trans-abstract><kwd-group xml:lang="en"><kwd>L,D-transpeptidase</kwd><kwd>Mycobacterium tuberculosis</kwd><kwd>enzyme purification</kwd><kwd>recombinant enzyme</kwd><kwd>enzyme reactivation</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>L,D-транспептидаза</kwd><kwd>Mycobacterium tuberculosis</kwd><kwd>очистка фермента</kwd><kwd>рекомбинантный фермент</kwd><kwd>реактивация фермента</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was financially supported by the Russian Science Foundation (grant No. 15-14-00069).</funding-statement><funding-statement xml:lang="ru">Работа выполнена при финансовой поддержке Российского научного фонда (грант № 15-14-00069).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>[1] // Global tuberculosis report 2016 // World Health Organization. 2016</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>[2] Betts J.C., Lukey P.T., Robb L.C., McAdam R.A., Duncan K. // Mol. 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