Peroxidase that is able to convert a large number of compounds, but its physiological substrate is not known. Shows high reactivity towards anthraquinone dyes (e.g. Reactive Blue 19) and a modest activity towards standard peroxidase substrates (such as guaiacol and 2,6-dimethoxyphenol) and azo dyes (e.g. Reactive Blue 5). Is also able to oxidize aromatic sulfides enantioselectively, resulting in the corresponding (R)-sulfoxides, but with a poor efficiency. Does not display catalase activity. 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 Binds 1 heme b (iron(II)-protoporphyrin IX) group non-covalently. kcat is 10 sec(-1) with Reactive Blue 19 as substrate. Optimum pH is 3.5 with Reactive Blue 19 as substrate. Optimum temperature is about 25 degrees Celsius. Thermostable. Retains 50% of its activity after heating 2 hours at 60 degrees Celsius, while no decrease in activity is observed within the same time at 30 or 40 degrees Celsius. Monomer. Exported by the Tat system. The position of the signal peptide cleavage has not been experimentally proven. Belongs to the DyP-type peroxidase family.