Manganese-independent peroxidase that is able to convert a large number of compounds, but its physiological substrate is not known. In addition to classic peroxidase substrates (e.g. 2,6-dimethoxyphenol), oxidizes dyes such as Reactive Blue 5 and Reactive Black 5. 2 H2O2 + Reactive Blue 5 = 2,2'-disulfonyl azobenzene + 3-[(4-amino-6-chloro-1,3,5-triazin-2-yl)amino]benzenesulfonate + 2 H(+) + 2 H2O + phthalate 2 a phenolic donor + H2O2 = 2 a phenolic radical donor + 2 H2O Binds 1 heme b (iron(II)-protoporphyrin IX) group non-covalently. Optimum pH is 4 with 2,6-dimethoxyphenol as substrate. Retains 90% of its activity after 4 hours at pH 2.5. Thermostable. Retains 50%-90% of its activity after heating for 2 hours at 60 degrees Celsius, while no decrease in activity is observed within the same time at 30 or 40 degrees Celsius. Belongs to the DyP-type peroxidase family.