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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">dan</journal-id><journal-title-group><journal-title xml:lang="ru">Доклады Национальной академии наук Беларуси</journal-title><trans-title-group xml:lang="en"><trans-title>Doklady of the National Academy of Sciences of Belarus</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-8323</issn><issn pub-type="epub">2524-2431</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-8323-2024-68-6-460-464</article-id><article-id custom-type="elpub" pub-id-type="custom">dan-1222</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>БИОЛОГИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>BIOLOGY</subject></subj-group></article-categories><title-group><article-title>Конформационные особенности белка HVEM при его цис- и транс-связывании с белком BTLA</article-title><trans-title-group xml:lang="en"><trans-title>Conformational features of HVEM protein upon its cis and trans binding to BTLA protein</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Урбан</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Urban</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Урбан Виктор Андреевич – канд. биол. наук, ст. науч. сотрудник</p><p>ул. Академическая, 27, 220072, Минск</p></bio><bio xml:lang="en"><p>Urban Viktar A. – Ph. D. (Biology), Senior Researcher</p><p>27, Akademicheskaya Str., 220072, Minsk</p></bio><email xlink:type="simple">urban@ibce.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Константинов</surname><given-names>Ф. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Kanstantinau</surname><given-names>F. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Константинов Франц Олегович – аспирант</p><p>ул. Академическая, 27, 220072, Минск</p></bio><bio xml:lang="en"><p>Kanstantinau Frants O. – Postgraduate Student</p><p>27, Akademicheskaya Str., 220072, Minsk</p></bio><email xlink:type="simple">frantskanstantinau@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Вересов</surname><given-names>В. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Veresov</surname><given-names>V. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Вересов Валерий Гавриилович – д-р биол. наук, гл. науч. сотрудник</p><p>ул. Академическая, 27, 220072, Минск</p></bio><bio xml:lang="en"><p>Veresov Valery G. – D. Sc. (Biology), Chief Researcher</p><p>27, Akademicheskaya Str., 220072, Minsk</p></bio><email xlink:type="simple">veresov@ibce.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт биофизики и клеточной инженерии Национальной академии наук Беларуси</institution></aff><aff xml:lang="en"><institution>Institute of Biophysics and Cell Engineering of the National Academy of Sciences of Belarus</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>08</day><month>01</month><year>2025</year></pub-date><volume>68</volume><issue>6</issue><fpage>460</fpage><lpage>464</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Урбан В.А., Константинов Ф.О., Вересов В.Г., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Урбан В.А., Константинов Ф.О., Вересов В.Г.</copyright-holder><copyright-holder xml:lang="en">Urban V.A., Kanstantinau F.O., Veresov V.G.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://doklady.belnauka.by/jour/article/view/1222">https://doklady.belnauka.by/jour/article/view/1222</self-uri><abstract><p>Активация T-клеток начинается при распознавании антигена T-клеточным рецептором и регулируется сигналами, генерируемыми костимулирующими и коингибирующими молекулами. Эти молекулы, называемые иммунными контрольными точками (иммунными чекпоинтами), являются привлекательными терапевтическими мишенями для иммунотерапии рака и аутоиммунных заболеваний. Коингибиторный сигнальный путь, образуемый между TNF-рецептором HVEM (HerpesVirus Entry Mediator, TNFRSF14) и BTLA (B and T Lymphocyte Attenuator), ограничивает активацию T-клеток. Однако BTLA может также служить активирующим лигандом для HVEM при его транс-взаимодействии с BTLA, находящимся на соседней клетке. Эксперименты с использованием мутагенеза показали, что HVEM и BTLA как при цис-, так и при транс-связывании обладают идентичными контактными поверхностями, что предполагает наличие значительных конформационных перестроек в стволовых областях между эктодоменом и трансмембранным доменом белка HVEM при переходе от цис- к транс-связыванию с белком BTLA. Однако из-за технических сложностей кристаллизации рецепторов на поверхности клеток, обладающих длинными стволовыми участками, атомистические 3D-структуры HVEM в цис- и транс-состоянии, а также атомистические 3D-структуры полноцепочечных цис- и транс-комплексов между HVEM и BTLA до настоящего времени неизвестны. В настоящей работе с использованием подходов биоинформатики установлены структуры полноцепочечных белков HVEM и BTLA и их комплексов при их цис- и транс-взаимодействии. Полученные результаты могут быть использованы при разработке иммунорегуляторов для лечения рака и аутоиммунных заболеваний.</p></abstract><trans-abstract xml:lang="en"><p>T-cell activation begins upon antigenic recognition by T-cell receptor and is regulated by signals generated by co-stimulating and co-inhibiting molecules. These molecules, known as immune checkpoints, are attractive therapeutic targets for the therapy of cancer and autoimmune diseases. Co-inhibiting signal pathway formed between TNF-receptor HVEM (Herpes- Virus Entry Mediator, TNFRSF14) and BTLA (B and T Lymphocyte Attenuator) limits T-cell activation. However, BTLA can serve also as activating ligand when interacts with HVEM on adjacent cell. Mutagenesis experiments have shown that the same interface is formed between HVEM and BTLA both upon cis and trans interactions thus suggesting significant conformational rearrangement in the HVEM stalk region between ectodomain and transmembrane domains upon transfer from cis to trans binding to BTLA. However, because of technical problems of the crystallization of surface receptor with long stalks, HVEM atomistic 3D-structures including stalk region are absent up to now. In this study, the approaches of structural bioinformatics were used to determine the structures of full-length proteins HVEM and BTLA and their complexes upon cis- and trans-interactions. The results obtained can be used upon developing immunoregulators for the immunotherapy of cancer and autoimmune diseases.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>T-клетка</kwd><kwd>иммунные контрольные точки</kwd><kwd>HVEM</kwd><kwd>BTLA</kwd><kwd>цис- и транс-связывание</kwd></kwd-group><kwd-group xml:lang="en"><kwd>T-cell</kwd><kwd>immune checkpoints</kwd><kwd>HVEM</kwd><kwd>BTLA</kwd><kwd>cis and trans binding</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при финансовой поддержке Белорусского республиканского фонда фундаментальных исследований (грант Б22-016).</funding-statement><funding-statement xml:lang="en">The work has been sponsored by the Belarusian Republican Foundation for Fundamental Research (Grant Б22-016).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Beyond the anti-PD-1/PD-L1 era: promising role of the BTLA/HVEM axis as a future target for cancer immunotherapy / C. 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