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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">670599</article-id><article-id pub-id-type="doi">10.31857/S0132342323030235</article-id><article-id pub-id-type="edn">PECUIO</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">From Peptides to Receptors</article-title><trans-title-group xml:lang="ru"><trans-title>От пептидов к рецепторам</trans-title></trans-title-group></title-group><contrib-group><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>victortsetlin3f@gmail.com</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><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>224</fpage><lpage>228</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, В.И. Цетлин</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, В.И. Цетлин</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">В.И. Цетлин</copyright-holder><copyright-holder xml:lang="ru">В.И. Цетлин</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0132-3423/article/view/670599">https://journals.eco-vector.com/0132-3423/article/view/670599</self-uri><abstract xml:lang="en"><p id="idm45181324579744">In the 1960s and 1970s, the Institute of Chemistry of Natural Compounds developed a topochemical approach for designing new biologically active peptide compounds, the applicability of which to the creation of inhibitors and effective substrates of proteolytic enzymes was shown by the author of this review under the direct supervision of V.T. Ivanov. The next task was to establish the conformation of protein neurotoxins from snake venoms and to study the topography of their binding to the target, the nicotinic acetylcholine receptor (nAChR) from the electric organ of the <italic>Torpedo marmorata</italic> ray. With selectively labeled derivatives containing one fluorescent or spin label on established amino acid residues, neurotoxin residues in contact with nAChR were identified for the first time. Later, in collaboration with the laboratory of V.T. Ivanov, new analogues of α-conotoxins (peptide neurotoxins from poisonous mollusks <italic>Conus</italic>), were synthesized including their photoactivated derivatives, which showed the participation of all <italic>Torpedo</italic> nAChR subunits in the binding of α‑conotoxins. The final part of the review briefly presents the recent achievements of the Department of Molecular Neuroimmune Signaling (headed by V.I. Tsetlin) concerning the isolation and synthesis of new peptide and protein neurotoxins and the study of their mechanism of action.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45181324578624">В 1960–1970-х гг. в Институте химии природных соединений разрабатывался топохимический подход для конструирования новых биологически активных пептидных соединений, применимость которого к созданию ингибиторов и эффективных субстратов протеолитических ферментов автор этого обзора показал под непосредственным руководством В.Т. Иванова. Следующей задачей было установление конформации белковых нейротоксинов из ядов змей и изучение топографии их связывания с мишенью – никотиновым ацетилхолиновым рецептором (нАХР) из электрического органа ската <italic>Torpedo marmorata</italic>. С помощью селективно меченых производных нейротоксинов, содержащих на установленных аминокислотных остатках по одной флуоресцентной или спиновой метке, впервые были идентифицированы остатки нейротоксина, контактирующие с нАХР. Позднее в сотрудничестве с лабораторией В.Т. Иванова были синтезированы новые аналоги α-конотоксинов (пептидных нейротоксинов из ядовитых моллюсков <italic>Conus</italic>), включая их фотоактивируемые производные, с помощью которых было показано участие всех субъединиц нАХР <italic>Torpedo</italic> в связывании α‑конотоксинов. В заключительной части обзора кратко представлены недавние достижения отдела молекулярной нейроиммунной сигнализации (руководитель В.И. Цетлин), касающиеся выделения и синтеза новых пептидных и белковых нейротоксинов и исследования механизма их действия.</p></trans-abstract><kwd-group xml:lang="en"><kwd><italic>peptides</italic></kwd><kwd><italic>neurotoxins</italic></kwd><kwd><italic>nicotinic acetylcholine receptor</italic></kwd><kwd>α<italic>-conotoxins</italic></kwd></kwd-group><kwd-group xml:lang="ru"><kwd><italic>пептиды</italic></kwd><kwd><italic>нейротоксины</italic></kwd><kwd><italic>никотиновый ацетилхолиновый рецептор</italic></kwd><kwd>α<italic>-конотоксины</italic></kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Shemyakin M.M., Ovchinnikov Yu.A., Ivanov V.T. // Angew. Chem. 1969. V. 14. P. 523–529.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Цетлин В.И., Шепель Е.Н., Иванов В.Т., Овчинников Ю.А. // Биохимия. 1975. Т. 40. 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