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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">Microbiology</journal-id><journal-title-group><journal-title xml:lang="en">Microbiology</journal-title><trans-title-group xml:lang="ru"><trans-title>Микробиология</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0026-3656</issn><issn publication-format="electronic">3034-5464</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">698748</article-id><article-id pub-id-type="doi">10.7868/S3034546425060031</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>EXPERIMENTAL 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">Methanoculleus bovis sp. nov., a New Methane-Producing Hydrogen-Utilizing Archaea from the Rumen of a Cow</article-title><trans-title-group xml:lang="ru"><trans-title>METHANOCULLEUS BOVIS SP. NOV., НОВАЯ МЕТАНООБРАЗУЮЩАЯ ВОДОРОДИСПОЛЬЗУЮЩАЯ АРХЕЯ ИЗ РУБЦА КОРОВЫ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Trubitsyn</surname><given-names>V. E.</given-names></name><name xml:lang="ru"><surname>Трубицын</surname><given-names>В. Э.</given-names></name></name-alternatives><email>lichoradkin43@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Rechkina</surname><given-names>V. I.</given-names></name><name xml:lang="ru"><surname>Речкина</surname><given-names>В. И.</given-names></name></name-alternatives><email>lichoradkin43@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Suzina</surname><given-names>N. E.</given-names></name><name xml:lang="ru"><surname>Сузина</surname><given-names>Н. Е.</given-names></name></name-alternatives><email>lichoradkin43@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Plotnikov</surname><given-names>A. O.</given-names></name><name xml:lang="ru"><surname>Плотников</surname><given-names>А. О.</given-names></name></name-alternatives><email>lichoradkin43@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Valyshev</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Валышев</surname><given-names>А. В.</given-names></name></name-alternatives><email>lichoradkin43@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kataev</surname><given-names>V. Ya.</given-names></name><name xml:lang="ru"><surname>Катаев</surname><given-names>В. Я.</given-names></name></name-alternatives><email>lichoradkin43@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shcherbakova</surname><given-names>V. A.</given-names></name><name xml:lang="ru"><surname>Щербакова</surname><given-names>В. А.</given-names></name></name-alternatives><email>lichoradkin43@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Federal Research Center “Pushchino Scientific Center for Biological Research of the Russian Academy of Sciences”, G.K. Scriabin Institute of Biochemistry and Physiology of Microorganisms of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Федеральный исследовательский центр “Пущинский научный центр биологических исследований Российской академии наук”, Институт биохимии и физиологии микроорганизмов им. Г.К. Скрябина РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Orenburg Federal Research Center, Ural Branch of the Russian Academy of Sciences, Institute of Cellular and Intracellular Symbiosis of the Ural Branch of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Оренбургский федеральный исследовательский центр Уральского отделения Российской академии наук, Институт клеточного и внутриклеточного симбиоза Уральского отделения Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-12-16" publication-format="electronic"><day>16</day><month>12</month><year>2025</year></pub-date><volume>94</volume><issue>6</issue><issue-title xml:lang="en">VOL 94, NO6 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 94, №6 (2025)</issue-title><fpage>527</fpage><lpage>539</lpage><history><date date-type="received" iso-8601-date="2025-12-16"><day>16</day><month>12</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2026-12-16"/></permissions><self-uri xlink:href="https://snv63.ru/0026-3656/article/view/698748">https://snv63.ru/0026-3656/article/view/698748</self-uri><abstract xml:lang="en"><p>A new methanogen, strain 7T<sup>T</sup>, was isolated from the rumen of a cow (Moscow region, Russia). Morphologically, the strain is composed of non-motile coccoid cells of irregular shape, 1.3–4.3 μm in size, and small aggregates thereof. The strain uses exclusively a mixture of hydrogen and carbon dioxide as energy substrates for methanogenesis and requires the presence of acetate in the culture medium. The cells grow at a temperature of 20–53°C (optimum 45°C), pH 6.5–7.8 (optimum pH 7.2–7.4), and are tolerant to NaCl levels up to 0.34 M. According to the 16S rRNA gene sequence analysis, the new methanogen belongs to the genus Methanoculleus, sharing a gene similarity level of 98.16% with the closest species of this genus, M. bourgensis MS2<sup>T</sup>. The average nucleotide similarity (ANI) between the genomes of strains 7T<sup>T</sup> and M. bourgensis MS2<sup>T</sup> was 88.24%, and the virtual estimate of hybridization of the genomes of these two strains was 31.40%. The G + C content of genomic DNA is 61.27% mol. %. Based on the phylogenetic analysis and physiological and biochemical properties of the isolate, we propose to classify the isolated strain 7T<sup>T</sup> (= VKM B-3409<sup>T</sup> = JCM 39547<sup>T</sup>) as a new species Methanoculleus bovis sp. nov.</p></abstract><trans-abstract xml:lang="ru"><p>Из содержимого рубца коровы (Московская область, Россия) выделена новая метанообразующая архея — штамм 7T<sup>T</sup>. Морфологически штамм представляет собой неподвижные кокковидные клетки неправильной формы размером 1.3—4.3 мкм и их небольшие агрегаты. В качестве энергетических субстратов для метаногенеза штамм использует исключительно смесь водорода и углекислоты и требует присутствия ацетата в среде культивирования. Клетки растут при температуре 20—53°С (оптимум 45°С), рН 6.5—7.8 (оптимум рН 7.2—7.4) и толерантны к содержанию NaCl до 0.34 М. По данным анализа последовательности гена 16S рРНК новый метаноген принадлежит к роду Methanoculleus, имея с ближайшим к нему видом этого рода M. bourgensis MS2<sup>T</sup> уровень сходства этого гена 98.16%. Среднее нуклеотидное сходство (ANI) между геномами штаммов 7T<sup>T</sup> и M. bourgensis MS2<sup>T</sup> составило 88.24%, а виртуальная оценка гибридизации геномов этих двух штаммов составила 31.40%. Содержание Г + Ц геномной ДНК составляет 61.27% мол. %. На основании данных филогенетического анализа и физиолого-биохимических свойств изолята мы предлагаем отнести выделенный штамм 7T<sup>T</sup> (= VKM B-3409<sup>T</sup> = JCM 39547<sup>T</sup>) к новому виду Methanoculleus bovis sp. nov.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Methanoculleus bovis sp. nov.</kwd><kwd>archaea</kwd><kwd>hydrogen-utilizing methanogens</kwd><kwd>bovine rumen</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Methanoculleus bovis sp. nov.</kwd><kwd>археи</kwd><kwd>водородиспользующие метаногены</kwd><kwd>рубец KPC</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was funded by the Ministry of Science and Higher Education of the Russian Federation, Agreement No. 075-15-2025-485.</funding-statement><funding-statement xml:lang="ru">Работа выполнена при финансовой поддержке Министерства науки и высшего образования РФ, Соглашение № 075-15-2025-485.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Agostini S., Bucci L., Doni D., Costantini P., Gupte A., Müller B., Sibilla F., Basaglia M., Casella S., Kougias P.G., Campanaro S., Favaro L., Treu L. 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