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Here we report that vaccinia virus topoisomerase I has significant difference in substrate preference from the other homologous type I topoisomerases. Vaccinia virus topoisomerase I shows a definite preference for removal of positive supercoils. In contrast, topoisomerase I from human, wheat germ and <jats:italic>Saccharomyces cerevisiae<\/jats:italic> has little preference between positive and negative supercoils. The vaccinia enzyme may have evolved for functions required for optimal viral growth.<\/jats:p>","DOI":"10.1016\/0014-5793(96)00317-1","type":"journal-article","created":{"date-parts":[[2002,7,25]],"date-time":"2002-07-25T17:55:22Z","timestamp":1027619722000},"page":"265-268","source":"Crossref","is-referenced-by-count":9,"title":["Vaccinia virus DNA topoisomerase I preferentially removes positive supercoils from DNA"],"prefix":"10.1002","volume":"384","author":[{"given":"Maria-Elena","family":"Fernandez-Beros","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuk-Ching","family":"Tse-Dinh","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[1999,11,30]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.bi.54.070185.003313"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0065-3233(08)60526-4"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2958.1992.tb01486.x"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/0022-2836(86)90129-4"},{"key":"e_1_2_1_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0021-9258(19)84661-6"},{"key":"e_1_2_1_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/0092-8674(89)90855-6"},{"key":"e_1_2_1_8_1","first-page":"4753","volume-title":"Proc. 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