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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">698750</article-id><article-id pub-id-type="doi">10.7868/S3034546425060057</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">Features of Betaine Reduction by Haloalkaliphilic Bacteria Alkaliphilus peptidifermentans during Growth on Amino Acids and Ethanolamine</article-title><trans-title-group xml:lang="ru"><trans-title>ОСОБЕННОСТИ ВОССТАНОВЛЕНИЯ БЕТАИНА ГАЛОАЛКАЛОФИЛЬНОЙ БАКТЕРИЕЙ ALKALIPHILUS PEPTIDIFERMENTANS ПРИ РОСТЕ НА АМИНОКИСЛОТАХ И ЭТАНОЛАМИНЕ<sup>1</sup></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Boltyanskaya</surname><given-names>Yu. V.</given-names></name><name xml:lang="ru"><surname>Болтянская</surname><given-names>Ю. В.</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>Detkova</surname><given-names>E. N.</given-names></name><name xml:lang="ru"><surname>Деткова</surname><given-names>Е. Н.</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>Oshkin</surname><given-names>I. Yu.</given-names></name><name xml:lang="ru"><surname>Ошкин</surname><given-names>И. Ю.</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>Parshina</surname><given-names>S. N.</given-names></name><name xml:lang="ru"><surname>Паршина</surname><given-names>С. Н.</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>Pimenov</surname><given-names>N. V.</given-names></name><name xml:lang="ru"><surname>Пименов</surname><given-names>Н. В.</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>Kevbrin</surname><given-names>V. V.</given-names></name><name xml:lang="ru"><surname>Кевбрин</surname><given-names>В. В.</given-names></name></name-alternatives><email>kevbrin@inmi.ru</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, FRC “Fundamentals of Biotechnology” of the RAS</institution></aff><aff><institution xml:lang="ru">Институт микробиологии имени С.Н. Виноградского, ФИЦ “Фундаментальные основы 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>549</fpage><lpage>564</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/698750">https://snv63.ru/0026-3656/article/view/698750</self-uri><abstract xml:lang="en"><p>The ability of the haloalkaliphilic anaerobic bacterium Alkaliphilus peptidifermentans Z-7036<sup>T</sup> to utilize betaine in oxidation-reduction reactions as an electron acceptor was studied. During growth on serine/threonine, a previously unknown molar stoichiometric ratio with betaine of 1 : 2 was revealed. To explain this phenomenon, a pathway for the degradation of these amino acids was proposed and the sites of conjugation with the betaine reductase complex were determined. The activities of key enzymes of threonine and serine metabolism were measured. The Stickland reaction with betaine for proline and ornithine was demonstrated for the first time and a rationale for its implementation was proposed. Biochemical mechanisms were revealed that make it possible to reduce betaine during growth on ethanolamine. Based on the genome annotation, schemes of metabolic pathways for the degradation of threonine, serine, proline, glutamate, arginine, ornithine and ethanolamine were constructed. For all used substrates, the exchange products were determined and stoichiometric ratios with betaine and products were obtained.</p></abstract><trans-abstract xml:lang="ru"><p>Изучена способность галоалкалофильной анаэробной бактерии Alkaliphilus peptidifermentans Z-7036<sup>T</sup> к использованию бетаина в окислительно-восстановительных реакциях в качестве акцептора электронов. При росте на серине/треонине выявлено не известное ранее молярное стехиометрическое соотношение с бетаином 1: 2. Для объяснения этого феномена предложен путь разложения данных аминокислот и определены места сопряжения с бетаинредуктазным комплексом. Измерены активности ключевых ферментов метаболизма треонина и серина. Впервые продемонстрирована реакция Стикленда с бетаином для пролина и орнитина и предложено обоснование ее реализации. Выявлены биохимические механизмы, за счет которых возможно восстановление бетаина при росте на этаноламине. На основании аннотации генома построены схемы метаболических путей распада треонина, серина, пролина, глутамата, аргинина, орнитина и этаноламина. Для всех используемых субстратов определены продукты обмена и получены стехиометрические соотношения с бетаином и продуктами.</p></trans-abstract><kwd-group xml:lang="en"><kwd>betaine</kwd><kwd>betaine reductase complex</kwd><kwd>amino acids</kwd><kwd>ethanolamine</kwd><kwd>anaerobic haloalkaliphiles</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>бетаин</kwd><kwd>бетаинредуктазный комплекс</kwd><kwd>аминокислоты</kwd><kwd>этаноламин</kwd><kwd>анаэробные галоалкалофилы</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Болтянская Ю.В., Деткова Е.Н., Шумский А.Н., Дулов Л.Е., Пушева М.А. Осмоадаптация у представителей галоалкалофильных бактерий из содовых озер // Микробиология. 2005. Т. 74. 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