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In viper venom, some of the most potent toxins are the haemorrhagic and coagulopathic snake venom metalloproteinases (SVMPs). Because venoms contain an SVMP cocktail and due to their cytotoxicity, SVMP characterisations have been hampered by the lack of purified enzymes. By incorporating their prodomain, which blocks the active SVMP site, we overcame their cytotoxicity and enabled recombinant production of zymogens from all three structurally variable SVMP classes (PI, PII, and PIII) using our baculovirus\/insect cell expression system. Zymogens were auto-activated by incubation with Zn\n                    <jats:sup>2+<\/jats:sup>\n                    ions, resulting in prodomain cleavage, PII disintegrin cleavage and PIII prodomain proteolysis. Auto-activated SVMPs were characterised using protein substrate degradation, platelet aggregation and blood coagulation assays, benchmarked to native venom-purified SVMP. Our recombinant zymogen production protocol is generically applicable for the expression of SVMPs, unlocking biomedical use in haematology and discovery of novel snakebite therapeutics.\n                  <\/jats:p>","DOI":"10.7554\/elife.109112","type":"journal-article","created":{"date-parts":[[2026,1,21]],"date-time":"2026-01-21T14:30:14Z","timestamp":1769005814000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.109112","source":"Crossref","is-referenced-by-count":2,"title":["Purified zymogens reveal mechanisms of snake venom metalloproteinase auto-activation"],"prefix":"10.7554","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3176-6004","authenticated-orcid":true,"given":"Sophie","family":"Hall","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0524sp257","id-type":"ROR","asserted-by":"publisher"}],"name":"School of Biochemistry, University of Bristol","place":["Bristol, United 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