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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">10404</article-id><article-id pub-id-type="doi">10.32607/20758251-2017-9-1-81-87</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">Dual Active Site in the Endolytic Transglycosylase gp144 of Bacteriophage phiKZ</article-title><trans-title-group xml:lang="ru"><trans-title>Второй активный центр в эндолитической трансгликозилазе gp144 бактериофага phiKZ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Chertkov</surname><given-names>O. V.</given-names></name><name xml:lang="ru"><surname>Чертков</surname><given-names>O. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kmi@ibch.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Armeev</surname><given-names>G. A.</given-names></name><name xml:lang="ru"><surname>Армеев</surname><given-names>Г. A.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kmi@ibch.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Uporov</surname><given-names>I. V.</given-names></name><name xml:lang="ru"><surname>Упоров</surname><given-names>И. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kmi@ibch.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Legotsky</surname><given-names>S. A.</given-names></name><name xml:lang="ru"><surname>Легоцкий</surname><given-names>С. A.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kmi@ibch.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sykilinda</surname><given-names>N. N.</given-names></name><name xml:lang="ru"><surname>Сыкилинда</surname><given-names>Н. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kmi@ibch.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shaytan</surname><given-names>A. K.</given-names></name><name xml:lang="ru"><surname>Шайтан</surname><given-names>A. K.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kmi@ibch.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Klyachko</surname><given-names>N. L.</given-names></name><name xml:lang="ru"><surname>Клячко</surname><given-names>Н. Л.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kmi@ibch.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Miroshnikov</surname><given-names>K. A.</given-names></name><name xml:lang="ru"><surname>Мирошников</surname><given-names>K. A.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kmi@ibch.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry</institution></aff><aff><institution xml:lang="ru">Институт биоорганической химии им. академиков М.М. Шемякина и Ю.А. Овчинникова РАН</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="2017-03-15" publication-format="electronic"><day>15</day><month>03</month><year>2017</year></pub-date><volume>9</volume><issue>1</issue><issue-title xml:lang="en">VOL 9, NO1 (2017)</issue-title><issue-title xml:lang="ru">ТОМ 9, №1 (2017)</issue-title><fpage>81</fpage><lpage>87</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 ©; 2017, Chertkov O.V., Armeev G.A., Uporov I.V., Legotsky S.A., Sykilinda N.N., Shaytan A.K., Klyachko N.L., Miroshnikov K.A.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2017, Чертков O.В., Армеев Г.A., Упоров И.В., Легоцкий С.A., Сыкилинда Н.Н., Шайтан A.K., Клячко Н.Л., Мирошников K.A.</copyright-statement><copyright-year>2017</copyright-year><copyright-holder xml:lang="en">Chertkov O.V., Armeev G.A., Uporov I.V., Legotsky S.A., Sykilinda N.N., Shaytan A.K., Klyachko N.L., Miroshnikov K.A.</copyright-holder><copyright-holder xml:lang="ru">Чертков O.В., Армеев Г.A., Упоров И.В., Легоцкий С.A., Сыкилинда Н.Н., Шайтан A.K., Клячко Н.Л., Мирошников K.A.</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/10404">https://actanaturae.ru/2075-8251/article/view/10404</self-uri><abstract xml:lang="en"><p>Lytic transglycosylases are abundant peptidoglycan lysing enzymes that degrade the heteropolymers of bacterial cell walls in metabolic processes or in the course of a bacteriophage infection. The conventional catalytic mechanism of transglycosylases involves only the Glu or Asp residue. Endolysin gp144 of Pseudomonas aeruginosa bacteriophage phiKZ belongs to the family of Gram-negative transglycosylases with a modular composition and C-terminal location of the catalytic domain. Glu115 of gp144 performs the predicted role of a catalytic residue. However, replacement of this residue does not completely eliminate the activity of the mutant protein. Site-directed mutagenesis has revealed the participation of Tyr197 in the catalytic mechanism, as well as the presence of a second active site involving Glu178 and Tyr147. The existence of the dual active site was supported by computer modeling and monitoring of the molecular dynamics of the changes in the conformation and surface charge distribution as a consequence of point mutations.</p></abstract><trans-abstract xml:lang="ru"><p>Литические трансгликозилазы - распространенный тип пептидогликанлизирующих ферментов, расщепляющих гетерополимеры клеточных стенок бактерий в процессе клеточного метаболизма или инфекции бактериофагом. Молекулярный механизм действия трансгликозилаз предполагает участие в активном центре фермента лишь одного аминокислотного остатка Glu или Asp. Эндолизин gp144 бактериофага phiKZ Pseudomonas aeruginosa принадлежит к группе грамотрицательных трансгликозилаз с модульным строением и С-концевым расположением каталитического домена. Предсказанную роль каталитического аминокислотного остатка в его структуре выполняет Glu115. Однако замена этого остатка не полностью удаляет активность мутантного белка. Направленный мутагенез выявил участие в каталитическом механизме Tyr197, а также второй активный центр с аминокислотными остатками Glu178 и Tyr147. Наличие дублирующего активного центра подтверждено методами компьютерного моделирования, молекулярной динамики конформационных изменений и изменения заряда поверхности и структуры при внесении точечных мутаций.</p></trans-abstract><kwd-group xml:lang="en"><kwd>bacteriophage phiKZ</kwd><kwd>endolysin</kwd><kwd>enzyme active site</kwd><kwd>molecular dynamics</kwd><kwd>site-directed mutagenesis</kwd><kwd>transglycosylase</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>активный центр фермента</kwd><kwd>бактериофаг phiKZ</kwd><kwd>молекулярная динамика</kwd><kwd>направленный мутагенез</kwd><kwd>трансгликозилаза</kwd><kwd>эндолизин</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was supported by the Russian Science Foundation (grant No. 16-16-00073).</funding-statement><funding-statement xml:lang="ru">Работа поддержана РНФ (грант № 16-16-00073).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>[1] Krylov V.N., Dela Cruz D.M., Hertveldt K., Ackermann H.W. // Arch. 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