:Scutelarin

{{Infobox enzyme

| Name = Scutelarin

| EC_number = 3.4.21.60

| CAS_number = 93389-45-8

| GO_code =

| image =

| width =

| caption =

}}

Scutelarin ({{EC number|3.4.21.60}}, taipan activator, Oxyuranus scutellatus prothrombin-activating proteinase) is an enzyme.{{cite journal | vauthors = Walker FJ, Owen WG, Esmon CT | title = Characterization of the prothrombin activator from the venom of Oxyuranus scutellatus scutellatus (taipan venom) | journal = Biochemistry | volume = 19 | issue = 5 | pages = 1020–3 | date = March 1980 | pmid = 6986908 | doi = 10.1021/bi00546a029 }}{{cite journal | vauthors = Speijer H, Govers-Riemslag JW, Zwaal RF, Rosing J | title = Prothrombin activation by an activator from the venom of Oxyuranus scutellatus (Taipan snake) | journal = The Journal of Biological Chemistry | volume = 261 | issue = 28 | pages = 13258–67 | date = October 1986 | pmid = 3531198 }} This enzyme catalyses the following chemical reaction

: Selective cleavage of Arg-Thr and Arg-Ile in prothrombin to form thrombin and two inactive fragments

This enzyme is isolated from the venom of the Taipan snake (Oxyuranus scutellatus).