Thrombin-like snake venom serine protease. Displays a specificity similar to trypsin. Releases only fibrinopeptide A in the conversion of fibrinogen to fibrin. Reversibly increases the permeability of the blood brain barrier (BBB) in mice (PubMed:11137545, PubMed:20637222). Induces the barrel rotation syndrome in mice, which is manifested by gyroxin-like, rapid rolling motions (PubMed:11137545, PubMed:20637222). This syndrome may be due to its effect on BBB permeability, and certainly also to other actions affecting endogenous substrates present in the endothelium, nervous tissues or blood (PubMed:11137545, PubMed:20637222). Also shows a moderate inhibitory activity on the human voltage-gated potassium channel Kv10.1/KCNH1/EAG1 (58% current inhibition at 5 uM) (PubMed:32161292). It blocks Kv10.1/KCNH1/EAG1 in a time and dose-dependent manner and with a mechanism independent of its enzymatic activity (By similarity). It may have a preference in interacting with Kv10.1/KCNH1/EAG1 in its closed state, since the inhibitory effect of the toxin is decreased at more depolarized potentials (By similarity). Monomer. Expressed by the venom gland. Does not have phospholipase activity, does not aggregate platelet, and does not affect the release of the neurotransmitters dopamine and acetylcholine in the nervous system. Belongs to the peptidase S1 family. Snake venom subfamily. Information taken from PubMed:20637222 and PubMed:11137545 are not linked to a specific sequence. Hence, it is not sure whether the function corresponds to this protein or to a paralog.