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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="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Membrane and Cell Biology</journal-id><journal-title-group><journal-title xml:lang="en">Membrane and Cell Biology</journal-title><trans-title-group xml:lang="ru"><trans-title>Биологические мембраны</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0233-4755</issn><issn publication-format="electronic">3034-5219</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">667374</article-id><article-id pub-id-type="doi">10.31857/S0233475523020068</article-id><article-id pub-id-type="edn">KWTSVK</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>СТАТЬИ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Application of N,N,N',N'-Tetramethyl-<italic>p</italic>-Phenylenediamine and α,ω-Hexadecanedioic Acid for Determination of the H<sup>+</sup>/O Ratios of Complexes III and IV of the Liver Mitochondrial Respiratory Chain under Free Respiration Conditions</article-title><trans-title-group xml:lang="ru"><trans-title>Применение N,N,Nꞌ,Nꞌ-тетраметил-<italic>п</italic>-фенилендиамина и α,ω-гексадекандикарбоновой кислоты для определения коэффициентов Н<sup>+</sup>/О комплексов III и IV дыхательной цепи митохондрий печени в условиях свободного дыхания</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Samartsev</surname><given-names>V. N.</given-names></name><name xml:lang="ru"><surname>Самарцев</surname><given-names>В. Н.</given-names></name></name-alternatives><email>dubinin1989@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Semenova</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Семенова</surname><given-names>А. А.</given-names></name></name-alternatives><email>dubinin1989@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Belosludtsev</surname><given-names>K. N.</given-names></name><name xml:lang="ru"><surname>Белослудцев</surname><given-names>К. Н.</given-names></name></name-alternatives><email>dubinin1989@gmail.com</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Dubinin</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Дубинин</surname><given-names>М. В.</given-names></name></name-alternatives><email>dubinin1989@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Mari State University</institution></aff><aff><institution xml:lang="ru">Марийский государственный университет</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Institute of Theoretical and Experimental Biophysics RAS</institution></aff><aff><institution xml:lang="ru">Институт теоретической и экспериментальной биофизики РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-03-01" publication-format="electronic"><day>01</day><month>03</month><year>2023</year></pub-date><volume>40</volume><issue>2</issue><fpage>122</fpage><lpage>132</lpage><history><date date-type="received" iso-8601-date="2025-02-26"><day>26</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, The Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Российская академия наук</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">The Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0233-4755/article/view/667374">https://journals.eco-vector.com/0233-4755/article/view/667374</self-uri><abstract xml:lang="en"><p id="idm45181323874256">Stimulation of mitochondrial respiration in state 4 without changes in passive proton leakage is known to be accompanied by a decrease in the H<sup>+</sup>/O ratio (Luvisetto et al., 1991. <italic>J. Biol. Chem</italic>. <bold>266</bold>, 1034–1042). In the present work, it was found that during the oxidation of succinate by liver mitochondria, N,N,N',N'-tetramethyl-<italic>p</italic>-phenylenediamine (TMPD) and α,ω-hexadecanedioic acid (HDA) effectively stimulate respiration in state 4, and their action, unlike the protonophore uncoupler DNP, is not caused by an increase in the proton conductivity of the inner membrane. Under these conditions, TMPD and HDA do not significantly affect the efficiency of oxidative ATP synthesis and energy transformation by complex IV (cytochrome <italic>c</italic> oxidase). The data obtained are considered as evidence that during the oxidation of succinate by liver mitochondria, TMPD and HDA selectively disable ETC complex III from energy transformation. It is theoretically substantiated that, under these conditions, the H<sup>+</sup>/O ratio can be determined based on the ratio of respiratory rates in the absence and presence of TMPD and HDA. Based on this model, we considered the change in the H<sup>+</sup>/O ratio depending on the stimulation of mitochondrial respiration in state 4 by TMPD and HDA. It has been established that under the influence of TMPD or HDA, the value of the H<sup>+</sup>/O ratio decreases during the oxidation of succinate from 6 to the limiting values of 2. We conclude that in liver mitochondria during free respiration, in contrast to the oxidative ATP synthesis, the values of the H<sup>+</sup>/O ratio are 4 and 2 for complexes III and IV, respectively.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45181323871952">Известно, что в отсутствие синтеза АТР и действия протонофорных разобщителей, то есть в состоянии 4, стимуляция дыхания митохондрий без изменения пассивной утечки протонов сопровождается снижением коэффициента Н<sup>+</sup>/О. В настоящей работе установлено, что при окислении сукцината митохондриями печени N,N,N',N'-тетраметил-<italic>п</italic>-фенилендиамин (ТМФД) и α,ω-гексадекандикарбоновая кислота (ГДК) эффективно стимулируют дыхание в состоянии 4, и такое их действие, в отличие от протонофорного разобщителя 2,4-динитрофенола (ДНФ), не вызвано усилением протонной проводимости внутренней мембраны. При этих условиях ТМФД и ГДК не оказывают существенного влияния на эффективность окислительного синтеза АТР и на трансформацию энергии комплексом IV (цитохром <italic>с</italic>-оксидазой). Полученные данные рассматриваются как свидетельство того, что при окислении сукцината митохондриями печени ТМФД и ГДК избирательно отключают комплекс III электрон транспортной цепи от трансформации энергии. Теоретически обосновано, что при этих условиях коэффициент Н<sup>+</sup>/О может быть определен исходя из отношения скоростей дыхания в отсутствие и в присутствии ТМФД и ГДК. Основываясь на этой модели, рассмотрено изменение коэффициента Н<sup>+</sup>/О в зависимости от стимуляции ТМФД и ГДК дыхания митохондрий в состоянии 4. Установлено, что под влиянием ТМФД или ГДК значение коэффициента Н<sup>+</sup>/О уменьшается при окислении сукцината с 6 до предельных значений 2. Сделано заключение, что в митохондриях печени при свободном дыхании, в отличие от окислительного синтеза АТР, значения коэффициента Н<sup>+</sup>/О составляют 4 и 2 для комплексов III и IV соответственно.</p></trans-abstract><kwd-group xml:lang="en"><kwd>liver mitochondria</kwd><kwd>H<sup>+</sup>/O ratio</kwd><kwd>free respiration</kwd><kwd>TMPD</kwd><kwd>α,ω-hexadecanedioic acid</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>митохондрии печени</kwd><kwd>коэффициент Н<sup>+</sup>/О</kwd><kwd>свободное дыхание</kwd><kwd>N,N,N',N'-тетраметил-<italic>п</italic>-фенилендиамин</kwd><kwd>α,ω-гексадекандикарбоновая кислота</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Mitchell P. 2011. Chemiosmotic coupling in oxidative and photosynthetic phosphorylation. Biochim. Biophys. Acta. 1807, 1507–1538.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Mitchell P., Moyle J. 1967. 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