Involved in the biosynthesis of phenazine natural products including myxin, an N(5),N(10)-dioxide phenazine antiobiotic, which has antimicrobial activity. Catalyzes the decarboxylative hydroxylations of phenazine 1,6-dicarboxylic acid (PDC) to produce 1,6-dihydroxyphenazine (DHP). Low activity with phenazine 1-carboxylic acid (PCA) to produce 1-hydroxyphenazine