venombin AB

{{Infobox enzyme

| Name = Venombin AB

| EC_number = 3.4.21.55

| CAS_number = 104003-74-9

| GO_code =

| image =

| width =

| caption =

}}

Venombin AB ({{EC number|3.4.21.55}}, gabonase, okinaxobin II, Bitis gabonica venom serine proteinase, afaâ, cytin) is an enzyme.{{cite journal | vauthors = Pirkle H, Theodor I, Miyada D, Simmons G | title = Thrombin-like enzyme from the venom of Bitis gabonica. Purification, properties, and coagulant actions | journal = The Journal of Biological Chemistry | volume = 261 | issue = 19 | pages = 8830–5 | date = July 1986 | pmid = 3522580 }} This enzyme catalyses the following chemical reaction

: Selective cleavage at Arg- bonds in fibrinogen to form fibrin and release fibrinopeptides A and B

This enzyme is isolated from the venom of the Gaboon viper Bitis gabonica.