Snake venom factor V activator () is an

enzyme An enzyme () is a protein that acts as a biological catalyst by accelerating chemical reactions. The molecules upon which enzymes may act are called substrate (chemistry), substrates, and the enzyme converts the substrates into different mol ...

. This enzyme catalyses the following

chemical reaction A chemical reaction is a process that leads to the chemistry, chemical transformation of one set of chemical substances to another. When chemical reactions occur, the atoms are rearranged and the reaction is accompanied by an Gibbs free energy, ...

: Fully activates human clotting factor V by a single cleavage at the Trp-Tyr-Leu-Arg1545-Ser-Asn-Asn-Gly bond. This enzyme is present in

venom Venom or zootoxin is a type of toxin produced by an animal that is actively delivered through a wound by means of a bite, sting, or similar action. The toxin is delivered through a specially evolved ''venom apparatus'', such as fangs or a sti ...

of ''

Daboia russelii Russell's viper (''Daboia russelii)'' is a species of highly venomous snake in the family Viperidae. The species is native to South Asia. It was described in 1797 by George Shaw and Frederick Polydore Nodder. It is named after Patrick Russell ...

''.

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* {{Portal bar, Biology, border=no EC 3.4.21