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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">11197</article-id><article-id pub-id-type="doi">10.32607/actanaturae.11197</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">Involvement of the N Domain Residues E34, K35, and R38 in the Functionally Active Structure of Escherichia coli Lon Protease</article-title><trans-title-group xml:lang="ru"><trans-title>Участие остатков E34, K35 и R38 N-домена в формировании функционально активной структуры Lon-протеазы Escherichia coli</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Andrianova</surname><given-names>A. G.</given-names></name><name xml:lang="ru"><surname>Андрианова</surname><given-names>А. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>tatyana.rotanova@ibch.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kudzhaev</surname><given-names>A. M.</given-names></name><name xml:lang="ru"><surname>Куджаев</surname><given-names>А. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>tatyana.rotanova@ibch.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Abrikosova</surname><given-names>V. A.</given-names></name><name xml:lang="ru"><surname>Абрикосова</surname><given-names>В. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>tatyana.rotanova@ibch.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gustchina</surname><given-names>A. E.</given-names></name><name xml:lang="ru"><surname>Гущина</surname><given-names>А. Е.</given-names></name></name-alternatives><address><country country="US">United States</country></address><email>tatyana.rotanova@ibch.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Smirnov</surname><given-names>I. V.</given-names></name><name xml:lang="ru"><surname>Смирнов</surname><given-names>И. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>tatyana.rotanova@ibch.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Rotanova</surname><given-names>T. V.</given-names></name><name xml:lang="ru"><surname>Ротанова</surname><given-names>Т. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>tatyana.rotanova@ibch.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences</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">Macromolecular Crystallography Laboratory NCI-Frederick</institution></aff><aff><institution xml:lang="ru"></institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2020-12-22" publication-format="electronic"><day>22</day><month>12</month><year>2020</year></pub-date><volume>12</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>86</fpage><lpage>97</lpage><history><date date-type="received" iso-8601-date="2020-09-09"><day>09</day><month>09</month><year>2020</year></date><date date-type="accepted" iso-8601-date="2020-10-22"><day>22</day><month>10</month><year>2020</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2020, Andrianova A.G., Kudzhaev A.M., Abrikosova V.A., Gustchina A.E., Smirnov I.V., Rotanova T.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2020, Андрианова А.Г., Куджаев А.М., Абрикосова В.А., Гущина А.Е., Смирнов И.В., Ротанова Т.В.</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="en">Andrianova A.G., Kudzhaev A.M., Abrikosova V.A., Gustchina A.E., Smirnov I.V., Rotanova T.V.</copyright-holder><copyright-holder xml:lang="ru">Андрианова А.Г., Куджаев А.М., Абрикосова В.А., Гущина А.Е., Смирнов И.В., Ротанова Т.В.</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/11197">https://actanaturae.ru/2075-8251/article/view/11197</self-uri><abstract xml:lang="en"><p>ATP-dependent Lon protease of <italic>Escherichia coli</italic> (<italic>Ec</italic>Lon), which belongs to the superfamily of AAA<sup>+</sup> proteins, is a key component of the cellular proteome quality control system. It is responsible for the cleavage of mutant, damaged, and short-lived regulatory proteins that are potentially dangerous for the cell. <italic>Ec</italic>Lon functions as a homooligomer whose subunits contain a central characteristic AAA<sup>+</sup> module, a C-terminal protease domain, and an N-terminal non-catalytic region composed of the actual N-terminal domain and the inserted α-helical domain. An analysis of the N domain crystal structure suggested a potential involvement of residues E34, K35, and R38 in the formation of stable and active <italic>Ec</italic>Lon. We prepared and studied a triple mutant LonEKR in which these residues were replaced with alanine. The introduced substitutions were shown to affect the conformational stability and nucleotide-induced intercenter allosteric interactions, as well as the formation of the proper protein binding site.</p></abstract><trans-abstract xml:lang="ru"><p>АТР-зависимая Lon-протеаза <italic>Escherichia coli </italic>(<italic>Ес</italic>Lon), относящаяся к суперсемейству ААА<sup>+</sup>-белков, является ключевым участником системы контроля качества клеточного протеома, в которой она отвечает за расщепление потенциально опасных для клетки мутантных, поврежденных и короткоживущих регуляторных белков. <italic>Ес</italic>Lon функционирует как гомоолигомер, субъединица которого включает центральный характеристический ААА<sup>+</sup>-модуль, С-концевой протеазный домен, а также N-концевую некаталитическую область, образованную двумя доменами – собственно N-концевым и вставочным α-спирализованным. Анализ пространственной структуры N-домена позволил выявить остатки E34, K35 и R38 на поверхности молекулы фермента, предположительно вовлеченные в формирование стабильной, функционально активной <italic>Ec</italic>Lon-протеазы. Получен тройной мутант LonEKR, несущий замены остатков E34, K35 и R38 на аланин. Показано, что введение указанных замен влияет на конформационную стабильность и межцентровые аллостерические взаимодействия в ферменте, обусловленные действием нуклеотидов, а также на формирование корректного сайта связывания белкового субстрата.</p></trans-abstract><kwd-group xml:lang="en"><kwd>cellular proteome quality control</kwd><kwd>AAA+ proteins</kwd><kwd>ATP-dependent proteolysis</kwd><kwd>LonA proteases</kwd><kwd>N domain</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>контроль качества клеточного протеома</kwd><kwd>ААА+-белки</kwd><kwd>АТР-зависимый протеолиз</kwd><kwd>LonA-протеазы</kwd><kwd>N-домен</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>19-04-00646</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Gottesman S., Wickner S., Maurizi M.R. // Genes Dev. 1997. 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