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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">10359</article-id><article-id pub-id-type="doi">10.32607/20758251-2017-9-4-26-30</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Reviews</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Обзоры</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">The Contribution of Ribosomal Protein S1 to the Structure and Function of Qβ Replicase</article-title><trans-title-group xml:lang="ru"><trans-title>Вклад рибосомного белка S1 в структуру и функцию Qβ-репликазы</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kutlubaeva</surname><given-names>Z. Sh.</given-names></name><name xml:lang="ru"><surname>Кутлубаева</surname><given-names>З. Ш.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alexch@vega.protres.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Chetverina</surname><given-names>Е. V.</given-names></name><name xml:lang="ru"><surname>Четверина</surname><given-names>Е. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alexch@vega.protres.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Chetverin</surname><given-names>A. B.</given-names></name><name xml:lang="ru"><surname>Четверин</surname><given-names>A. Б.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alexch@vega.protres.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Protein Research</institution></aff><aff><institution xml:lang="ru">Институт белка РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2017-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2017</year></pub-date><volume>9</volume><issue>4</issue><issue-title xml:lang="en">VOL 9, NO4 (2017)</issue-title><issue-title xml:lang="ru">ТОМ 9, №4 (2017)</issue-title><fpage>26</fpage><lpage>30</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, Kutlubaeva Z.S., Chetverina Е.V., Chetverin A.B.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2017, Кутлубаева З.Ш., Четверина Е.В., Четверин A.Б.</copyright-statement><copyright-year>2017</copyright-year><copyright-holder xml:lang="en">Kutlubaeva Z.S., Chetverina Е.V., Chetverin A.B.</copyright-holder><copyright-holder xml:lang="ru">Кутлубаева З.Ш., Четверина Е.В., Четверин A.Б.</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/10359">https://actanaturae.ru/2075-8251/article/view/10359</self-uri><abstract xml:lang="en"><p>The high resolution crystal structure of bacterial ribosome was determined more than 10 years ago; however, it contains no information on the structure of the largest ribosomal protein, S1. This unusual protein comprises six flexibly linked domains; therefore, it lacks a fixed structure and this prevents the formation of crystals. Besides being a component of the ribosome, protein S1 also serves as one of the four subunits of Qβ replicase, the RNA-directed RNA polymerase of bacteriophage Qβ. In each case, the role of this RNA-binding protein has been thought to consist in holding the template close to the active site of the enzyme. In recent years, a breakthrough was made in studies of protein S1 within Qβ replicase. This includes the discovery of its paradoxical ability to displace RNA from the replicase complex and determining the crystal structure of its fragment capable of performing this function. The new findings call for a re-examination of the contribution of protein S1 to the structure and function of the ribosome.</p></abstract><trans-abstract xml:lang="ru"><p>Кристаллическая структура бактериальной рибосомы была решена с высоким разрешением более 10 лет назад, однако она не содержит информации о структуре самого большого рибосомного белка - S1. Этот необычный белок состоит из шести гибко сочлененных доменов, поэтому он не имеет фиксированной структуры, что мешает образованию кристаллов. Белок S1 является не только компонентом рибосомы, но и одной из четырех субъединиц Qβ-репликазы - РНК-зависимой-РНК-полимеразы бактериофага Qβ. Считалось, что в обоих случаях роль этого РНК-связывающего белка состоит в удержании матрицы вблизи активного центра фермента. В последние годы был совершен прорыв в исследовании белка S1 в составе Qβ-репликазы. В частности, обнаружена его парадоксальная способность вытеснять РНК из репликазного комплекса и установлена кристаллическая структура его фрагмента, способного выполнять эту функцию. Новые результаты заставляют переосмыслить вклад белка S1 в структуру и функцию рибосомы.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Bacteriophage Qβ</kwd><kwd>initiation</kwd><kwd>crystal structure</kwd><kwd>OB domain</kwd><kwd>ribosomal protein S1</kwd><kwd>RNA replication</kwd><kwd>RNA-directed RNA polymerase</kwd><kwd>termination</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>бактериофаг Qβ</kwd><kwd>инициация</kwd><kwd>кристаллическая структура</kwd><kwd>OB-домен</kwd><kwd>рибосомный белок S1</kwd><kwd>репликация РНК</kwd><kwd>РНК-зависимая-РНК-полимераза</kwd><kwd>терминация</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was supported by the Russian Science Foundation (project No. 14-14-00350).</funding-statement><funding-statement xml:lang="ru">Работа поддержана Российским научным фондом (проект № 14-14-00350).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>[1] Subramanian A.R. // Prog. 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