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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">Russian Journal of Bioorganic Chemistry</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Bioorganic Chemistry</journal-title><trans-title-group xml:lang="ru"><trans-title>Биоорганическая химия</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0132-3423</issn><issn publication-format="electronic">1998-2860</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">670619</article-id><article-id pub-id-type="doi">10.31857/S0132342323030156</article-id><article-id pub-id-type="edn">PDSQUE</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">A New Peptide from the Venom of the Madagascar Cat-Eyed Snake <italic>Madagascarophis colubrinus</italic> Blocks Nicotinic Acetylcholine Receptor</article-title><trans-title-group xml:lang="ru"><trans-title>Новый пептид из яда мадагаскарской кошачьеглазой змеи <italic>Madagascarophis colubrinus</italic> блокирует никотиновый холинорецептор</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kryukova</surname><given-names>E. V.</given-names></name><name xml:lang="ru"><surname>Крюкова</surname><given-names>Е. В.</given-names></name></name-alternatives><email>utkin@ibch.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ivanov</surname><given-names>D. A.</given-names></name><name xml:lang="ru"><surname>Иванов</surname><given-names>Д. А.</given-names></name></name-alternatives><email>utkin@ibch.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kopylova</surname><given-names>N. V.</given-names></name><name xml:lang="ru"><surname>Копылова</surname><given-names>Н. В.</given-names></name></name-alternatives><email>utkin@ibch.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Starkov</surname><given-names>V. G.</given-names></name><name xml:lang="ru"><surname>Старков</surname><given-names>В. Г.</given-names></name></name-alternatives><email>utkin@ibch.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Andreeva</surname><given-names>T. V.</given-names></name><name xml:lang="ru"><surname>Андреева</surname><given-names>Т. В.</given-names></name></name-alternatives><email>utkin@ibch.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ivanov</surname><given-names>I. A.</given-names></name><name xml:lang="ru"><surname>Иванов</surname><given-names>И. А.</given-names></name></name-alternatives><email>utkin@ibch.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tsetlin</surname><given-names>V. I.</given-names></name><name xml:lang="ru"><surname>Цетлин</surname><given-names>В. И.</given-names></name></name-alternatives><email>utkin@ibch.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Utkin</surname><given-names>Yu. N.</given-names></name><name xml:lang="ru"><surname>Уткин</surname><given-names>Ю. Н.</given-names></name></name-alternatives><email>utkin@ibch.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Shemyakin–Ovchinnikov Institute of Bioorganic Chemistry Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">ФГБУН “Институт биоорганической химии им. академиков М.М. Шемякина и Ю.А. Овчинникова” РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">FKOO “Labkorp”</institution></aff><aff><institution xml:lang="ru">ФКОО “Лабкорп”</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-05-01" publication-format="electronic"><day>01</day><month>05</month><year>2023</year></pub-date><volume>49</volume><issue>3</issue><fpage>296</fpage><lpage>305</lpage><history><date date-type="received" iso-8601-date="2025-02-27"><day>27</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Е.В. Крюкова, Д.А. Иванов, Н.В. Копылова, В.Г. Старков, Т.В. Андреева, И.А. Иванов, В.И. Цетлин, Ю.Н. Уткин</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Е.В. Крюкова, Д.А. Иванов, Н.В. Копылова, В.Г. Старков, Т.В. Андреева, И.А. Иванов, В.И. Цетлин, Ю.Н. Уткин</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Е.В. Крюкова, Д.А. Иванов, Н.В. Копылова, В.Г. Старков, Т.В. Андреева, И.А. Иванов, В.И. Цетлин, Ю.Н. Уткин</copyright-holder><copyright-holder xml:lang="ru">Е.В. Крюкова, Д.А. Иванов, Н.В. Копылова, В.Г. Старков, Т.В. Андреева, И.А. Иванов, В.И. Цетлин, Ю.Н. Уткин</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0132-3423/article/view/670619">https://journals.eco-vector.com/0132-3423/article/view/670619</self-uri><abstract xml:lang="en"><p id="idm45181324556112">In screening the venoms of various snake species, we found that the venom of the Madagascar cat-eyed snake <italic>Madagascarophis colubrinus</italic> competes with α-bungarotoxin for binding to the nicotinic acetylcholine receptor from <italic>Torpedo californica</italic>. Using liquid chromatography, a peptide, called macoluxin and inhibiting the binding of the toxin to the receptor, was isolated from the venom. The amino acid sequence of this 23-amino acid peptide was determined by automatic Edman degradation. Comparison with amino acid sequences of known proteins showed that the macoluxin sequence is homologous to the α-helical region of the sequence of snake venom metalloproteinases. The peptide was synthesized by solid-phase peptide synthesis, and the study of its biological activity showed that it inhibits the binding of α-bungarotoxin to the <italic>Torpedo</italic> receptor with an IC<sub>50</sub> of 47 μM. Macoluxin also reversibly inhibited acetylcholine-induced currents in the muscle-type nicotinic acetylcholine receptor. This is the first data on the presence in the venom of rear fanged snakes of a peptide that can inhibit the nicotinic acetylcholine receptor.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45181324555344">При скрининге ядов различных видов змей мы обнаружили, что яд мадагаскарской кошачьеглазой змеи <italic>Madagascarophis colubrinus</italic> конкурирует с α-бунгаротоксином за связывание с никотиновым холинорецептором <italic>Torpedo californica</italic>. С использованием жидкостной хроматографии из яда выделен пептид, ингибирующий связывание α-бунгартоксина с этим рецептором и названный маколуксином. Аминокислотная последовательность этого 23-членного пептида установлена методом автоматической деградации по Эдману. Сравнение с аминокислотными последовательностями известных белков показало, что последовательность маколуксина гомологична α-спиральному участку последовательности металлопротеиназ яда змей. Пептид маколуксин был синтезирован методом твердофазного пептидного синтеза. Исследование его биологической активности показало, что маколуксин ингибирует связывание α-бунгаротоксина с рецептором <italic>Torpedo</italic> (IC<sub>50</sub> = 47 мкМ). Маколуксин также обратимо ингибировал токи, вызванные ацетилхолином в никотиновом холинорецепторе мышечного типа человека. Это первые данные о наличии в яде заднебороздчатых змей пептида, способного ингибировать никотиновый холинорецептор.</p></trans-abstract><kwd-group xml:lang="en"><kwd><italic>Madagascar cat-eyed snake</italic></kwd><kwd><italic>venom</italic></kwd><kwd><italic>nicotinic acetylcholine receptor</italic></kwd><kwd><italic>peptide</italic></kwd><kwd><italic>inhibitor</italic></kwd><kwd><italic>macoluxin</italic></kwd></kwd-group><kwd-group xml:lang="ru"><kwd><italic>мадагаскарская кошачьеглазая змея</italic></kwd><kwd><italic>яд</italic></kwd><kwd><italic>никотиновый холинорецептор</italic></kwd><kwd><italic>пептид</italic></kwd><kwd><italic>ингибитор</italic></kwd><kwd><italic>маколуксин</italic></kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Madagascarophis colubrinus (Schlegel, 1837) // The Reptile Database, 2022. https://reptile-database.reptarium.cz/species?genus= Madagascarophis&amp;species=colubrinus&amp;search_param= %28%28genus%3D%27madagascarophis%27%29%29</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Domergue C.A. // Bull. 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