Cucumisin (EC 3.4.21.25, euphorbain, solanain, hurain, tabernamontanain) is an enzyme. This enzyme catalyses the following chemical reaction Cucumisin (EC 3.4.21.25, euphorbain, solanain, hurain, tabernamontanain) is an enzyme. This enzyme catalyses the following chemical reaction This enzyme is isolated from the sarcocarp of the musk melon (Cucumis melo).