Has exodeoxyribonuclease activity with lambda-DNA and salmon testes dsDNA. No activity with circular plasmid DNA. The physiological role of this enzyme may be to degrade environmental DNA, and thus mobilize nitrogen for uptake. Optimum pH is 9. No activity between pH 3-6. Optimum temperature is 45 degrees Celsius. Activity is about 80% of the maximum activity at 35 and 50 degrees Celsius. Homodimer. Causes an allergic reaction in human. Natural protein binds to IgE of patients allergic to toxic black mold fungus (PubMed:21109751, PubMed:22424314). Recombinant protein binds to IgE of patients allergic to toxic black mold fungus (PubMed:21109751). Binds to IgG (PubMed:22424314).