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Kunitz domain is characterized by the compact 3D structure with the most important inhibitory loops for the inhibition of S1 peptidases. In the present study we analysed the action of site-specific positive selection and its impact on the structurally and functionally important parts of the snake venom Kunitz\/BPTI family of proteins. By using numerous models we demonstrated the presence of large numbers of site-specific positively selected sites that can reach between 30\u201350% of the Kunitz domain. The mapping of the positively selected sites on the 3D model of Kunitz\/BPTI inhibitors has shown that these sites are located in the inhibitory loops 1 and 2, but also in the Kunitz scaffold. Amino acid replacements have been found exclusively on the surface, and the vast majority of replacements are causing the change of the charge. The consequence of these replacements is the change in the electrostatic potential on the surface of the Kunitz\/BPTI proteins that may play an important role in the precise targeting of these inhibitors into the active site of S1 family of serine peptidases.<\/jats:p>","DOI":"10.1038\/srep37054","type":"journal-article","created":{"date-parts":[[2016,11,14]],"date-time":"2016-11-14T10:18:24Z","timestamp":1479118704000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Strong and widespread action of site-specific positive selection in the snake venom Kunitz\/BPTI protein family"],"prefix":"10.1038","volume":"6","author":[{"given":"Vera","family":"\u017dupunski","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Du\u0161an","family":"Kordi\u0161","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2016,11,14]]},"reference":[{"key":"BFsrep37054_CR1","doi-asserted-by":"publisher","first-page":"705","DOI":"10.1042\/bj20031825","volume":"378","author":"ND Rawlings","year":"2004","unstructured":"Rawlings, N. 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