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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">698751</article-id><article-id pub-id-type="doi">10.7868/S3034546425060069</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">Serine Variant of the Reductive Glycine Pathway of CO<sub>2</sub> Fixation in the Anaerobic Thermophile Parvivirga hydrogeniphila</article-title><trans-title-group xml:lang="ru"><trans-title>СЕРИНОВЫЙ ВАРИАНТ ВОССТАНОВИТЕЛЬНОГО ГЛИЦИНОВОГО ПУТИ ФИКСАЦИИ СО<sub>2</sub> У АНАЭРОБНОГО ТЕРМОФИЛА PARVIVIRGA HYDROGENIPHILA</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Chernykh</surname><given-names>N. A.</given-names></name><name xml:lang="ru"><surname>Черных</surname><given-names>Н. А.</given-names></name></name-alternatives><email>chernyh3@yandex.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Rusanov</surname><given-names>I. I.</given-names></name><name xml:lang="ru"><surname>Русанов</surname><given-names>И. И.</given-names></name></name-alternatives><email>email@example.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Pikhtereva</surname><given-names>V. A.</given-names></name><name xml:lang="ru"><surname>Пихтерева</surname><given-names>В. А.</given-names></name></name-alternatives><email>email@example.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">S.N. Winogradsky Institute of Microbiology, Federal Research Center of Biotechnology, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт микробиологии им. С.Н. Виноградского, ФИЦ Биотехнологии РАН</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>565</fpage><lpage>572</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/698751">https://snv63.ru/0026-3656/article/view/698751</self-uri><abstract xml:lang="en"><p>Parvivirga hydrogeniphila Es71-Z01O1 is a thermophilic bacterium capable of anaerobically growing in the range of 25–70°C (optimum 47–60°C) and pH 6.0–8.5 (optimum 6.8–7.2) and using molecular hydrogen or formate as electron donors and Fe(III) as an acceptor. Genomic analysis revealed the presence of genes for the serine branch of the reductive glycine pathway in the absence of glycine reductase genes. Proteomic studies demonstrated increased expression of other key enzymes of this pathway: formate dehydrogenase, methyltetrahydrofolate cyclohydrolase, glycine cleavage system, and serine hydroxymethyltransferase. The rate of autotrophic carbon fixation was 0.357 fmol C/cell day, which is comparable with the rates of known autotrophic microorganisms. The obtained results indicate the functioning of autotrophic CO<sub>2</sub> assimilation in P. hydrogeniphila, with the serine variant of the reductive glycine pathway being the most probable. The results of the study contribute to the understanding of the metabolic diversity of anaerobic microorganisms and expand knowledge about the distribution of different carbon fixation mechanisms in microorganisms belonging to new phylogenetic groups.</p></abstract><trans-abstract xml:lang="ru"><p>Parvivirga hydrogeniphila Es71-Z0120 — термофильная бактерия, способная к анаэробному росту в диапазоне 25–70°C (оптимум 47–60°C) и pH 6.0–8.5 (оптимум 6.8–7.2) и использующая молекулярный водород или формиат в качестве доноров электронов, а Fe(III) в качестве акцептора. Геномный анализ выявил наличие генов сериновой ветви восстановительного глицинового пути при отсутствии генов глицинредуктазы. Протеомные исследования продемонстрировали повышенную экспрессию других ключевых ферментов этого пути: формиатдегидрогеназы, метилтетрагидрофолат циклогидролазы, системы расщепления глицина и серингидроксиметилтрансферазы. Скорость автотрофной фиксации углерода составила 0.357 фмоль C/кл. день, что сопоставимо с показателями известных автотрофных микроорганизмов. Полученные результаты указывают на функционирование у P. hydrogeniphila автотрофной ассимиляции CO<sub>2</sub>, причем наиболее вероятным является сериновый вариант восстановительного глицинового пути. Результаты исследования вносят вклад в понимание метаболического разнообразия анаэробных микроорганизмов и расширяют знания о распространении различных механизмов фиксации углерода у микроорганизмов, принадлежащих к новым филогенетическим группам.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Parvivirga hydrogeniphila</kwd><kwd>reductive glycine pathway</kwd><kwd>autotrophy</kwd><kwd>CO<sub>2</sub> fixation</kwd><kwd>proteomic analysis</kwd><kwd>serine hydroxymethyltransferase</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Parvivirga hydrogeniphila</kwd><kwd>восстановительный глициновый путь</kwd><kwd>автотрофия</kwd><kwd>фиксация CO<sub>2</sub></kwd><kwd>протеомный анализ</kwd><kwd>серингидроксиметилтрансфераза</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The main works were carried out with the support of the Russian Science Foundation project No. 24-24-00415.</funding-statement><funding-statement xml:lang="ru">Основные работы выполнены при поддержке проекта РНФ № 24-24-00415.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Aziz R.K., Bartels D., Best A.A., DeJongh M., Disz T., Edwards R.A., Formsma K., Gerdes S., Glass E.M., Kubal M. 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