alexa New pathway for degradation of sulfonated azo dyes by microbial peroxidases of Phanerochaete chrysosporium and Streptomyces chromofuscus.
Environmental Sciences

Environmental Sciences

Journal of Petroleum & Environmental Biotechnology

Author(s): Goszczynski S, Paszczynski A, PastiGrigsby MB, Crawford RL, Crawford DL

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Abstract Pathways for the degradation of 3,5-dimethyl-4-hydroxy-azobenzene-4'-sulfonic acid (I) and 3-methoxy-4-hydroxyazobenzene-4'-sulfonamide (II) by the manganese peroxidase and ligninase of Phanerochaete chrysosporium and by the peroxidase of Streptomyces chromofuscus have been proposed. Twelve metabolic products were found, and their mechanisms of formation were explained. Preliminary oxidative activation of the dyes resulted in the formation of cationic species, making the molecules vulnerable to the nucleophilic attack of water. Two types of hydrolytic cleavage were observed. Asymmetric splitting gave rise to quinone and diazene derivatives, while symmetric splitting resulted in the formation of quinone monoimine and nitroso derivatives. These unstable intermediates underwent further redox, oxidation, and hydrolytic transformation, eventually furnishing 11 organic products and ammonia.
This article was published in J Bacteriol and referenced in Journal of Petroleum & Environmental Biotechnology

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