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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">vestib</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной  академии наук Беларуси. Серия биологических наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus, Biological Series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1029-8940</issn><issn pub-type="epub">2524-230X</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">10.29235/1029-8940-2018-63-4-391-400</article-id><article-id custom-type="elpub" pub-id-type="custom">vestib-390</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>Статьи</subject></subj-group></article-categories><title-group><article-title>Стабильность альфа-спиральных и бета-структурных блоков в белках четырех структурных классов</article-title><trans-title-group xml:lang="en"><trans-title>Stability of alpha-helical and beta-structural blocks in proteins of four structural classes</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>Побойнев</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Poboinev</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Побойнев Виктор Витольдович – преподаватель-стажер.</p><p>пр. Дзержинского, 83, 220116, Минск.</p></bio><bio xml:lang="en"><p>Victor V. Poboinev – trainee-teacher.</p><p>83, Dzerzhynskii Ave., 220116, Minsk.</p></bio><email xlink:type="simple">dremozzew@mail.ru</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>Хрусталёв</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Khrustalev</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Хрусталёв Владислав Викторович – доцент, заведующий кафедрой. </p><p>пр. Дзержинского, 83, 220116, Минск.</p></bio><bio xml:lang="en"><p>Vladislav V.  Khrustalev – Assistant Professor, Head of the Department.</p><p>83, Dzerzhynskii Ave., 220116, Minsk.</p></bio><email xlink:type="simple">vvkhrustalev@mail.ru</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>Хрусталёва</surname><given-names>Т. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Khrustaleva</surname><given-names>T. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Хрусталёва Татьяна Александровна – старший научный сотрудник. </p><p>ул. Академическая, 28, 220072, Минск.</p></bio><bio xml:lang="en"><p>Tatyana A. Khrustaleva – Senior researcher.</p><p>28, Akademicheskaya Str., 220072, Minsk.</p></bio><email xlink:type="simple">tanissia.lir@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Стожаров</surname><given-names>А. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Stozharov</surname><given-names>A. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Стожаров Александр Николаевич – академик, доктор биологических наук, профессор, заведующий кафедрой. </p><p>пр. Дзержинского, 83, 220116, Минск.</p></bio><bio xml:lang="en"><p>Aleksander N. Stazharau – Academician, D. Sc. (Biol.), Professor, Head of the Department. </p><p>83, Dzerzhynskii Ave., 220116, Minsk.</p></bio><email xlink:type="simple">stojarov@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский государственный медицинский университет</institution></aff><aff xml:lang="en"><institution>Belarusian State Medical University</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт физиологии НАН Беларуси</institution></aff><aff xml:lang="en"><institution>Institute of Physiology of the National Academy of Sciences of Belarus</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2018</year></pub-date><pub-date pub-type="epub"><day>29</day><month>10</month><year>2018</year></pub-date><volume>63</volume><issue>4</issue><fpage>391</fpage><lpage>400</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Побойнев В.В., Хрусталёв В.В., Хрусталёва Т.А., Стожаров А.Н., 2018</copyright-statement><copyright-year>2018</copyright-year><copyright-holder xml:lang="ru">Побойнев В.В., Хрусталёв В.В., Хрусталёва Т.А., Стожаров А.Н.</copyright-holder><copyright-holder xml:lang="en">Poboinev V.V., Khrustalev V.V., Khrustaleva T.A., Stozharov A.N.</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://vestibio.belnauka.by/jour/article/view/390">https://vestibio.belnauka.by/jour/article/view/390</self-uri><abstract><p>В статье рассмотрены особенности строения групп взаимодействующих альфа-спиралей и групп взаимодействующих бета-тяжей (блоков) в выборках трехмерных структур негомологичных белков, относящихся к четырем структурным классам. Стабильность каждого элемента вторичной структуры оценивали с помощью алгоритма PentaFOLD, который способен выявлять альфа-спирали и бета-тяжи с наиболее характерными для данного вида вторичной структуры особенностями чередований аминокислотных остатков. Доказано, что в белках классов «альфа + бета» и «альфа/бета» чаще всего встречаются блоки, состоящие из двух взаимодействующих альфа-спиралей, отличающихся наибольшей степенью стабильности. В альфа-спиральных белках, как правило, встречаются блоки из 4 альфа-спиралей, в бета-структурных – отдельные короткие альфа-спирали, отличающиеся наименьшей степенью стабильности в белках этого класса. Наиболее устойчивыми следует считать бета-структуры из трех бета-тяжей, наименее устойчивыми – отдельные бета-шпильки. В белках класса «альфа + бета» наблюдается характерное расположение стабильных альфа-спиралей в начале альфа-спирального блока, стабильных бета-тяжей – в конце бета-структурного блока. Такое расположение стабильных альфа-спиралей и бета-тяжей способствует формированию устойчивой пространственной структуры, если белок начинается с бета-структурного домена, что наблюдается в большинстве случаев.</p></abstract><trans-abstract xml:lang="en"><p>In this article we showed the characteristic structural features of the groups of interacting alpha-helices and beta-strands (blocks) in four sets of nonhomologous proteins from different structural classes. Stability of each element of secondary structure has been checked with help of the PentaFOLD algorithm that finds intrinsic alpha-helical and beta-structural sequences of amino acid residues. We proved that the most frequent blocks of “alpha + beta” and “alpha/beta” proteins are 2 interacting alpha helices, and they demonstrate the highest level of stability. In alpha-helical proteins the most frequent blocks contain 4 alpha-helices. In beta-structural proteins alpha-helices most frequently do not interact with other helices and demonstrate the lowest level of stability. The most stable type of beta-structure is a block made from three interacting beta-strands, while the less stable one is a beta-hairpin. There is a characteristic distribution of stable alpha-helices in “alpha + beta” proteins: they are usually situated in the beginning of a block while stable beta-strands are usually situated in the end of the block. This type of distribution of stable alpha-helices and beta-strands helps the protein to form its stable three-dimensional structure in case  it begins from beta-structural domain which is the most frequent case for the structural class of proteins. </p></trans-abstract><kwd-group xml:lang="ru"><kwd>белок</kwd><kwd>бета-шпилька</kwd><kwd>бета-тяж</kwd><kwd>альфа-спираль</kwd><kwd>вторичная структура белка</kwd><kwd>пространственная структура белка</kwd></kwd-group><kwd-group xml:lang="en"><kwd>protein</kwd><kwd>beta-hairpin</kwd><kwd>beta-strand</kwd><kwd>alpha-helix</kwd><kwd>secondary structure of protein</kwd><kwd>three-dimensional structure of protein</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Kabsch, W. Dictionary of protein secondary structure: pattern recognition of hydrogen-bonded and geometrical features / W. Kabsch, C. 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