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The Metabolic Pathway of 4-Aminophenol in Burkholderia sp. Strain AK-5 Differs from That of Aniline and Aniline with C-4 Substituents

2003; American Society for Microbiology; Volume: 69; Issue: 9 Linguagem: Inglês

10.1128/aem.69.9.5410-5413.2003

1098-5336

Shinji Takenaka, Susumu Okugawa, Maho Kadowaki, Shuichiro Murakami, Kenji Aoki,

Enzyme Catalysis and Immobilization

ABSTRACT Burkholderia sp. strain AK-5 utilized 4-aminophenol as the sole carbon, nitrogen, and energy source. A pathway for the metabolism of 4-aminophenol in strain AK-5 was proposed based on the identification of three key metabolites by gas chromatography-mass spectrometry analysis. Strain AK-5 converted 4-aminophenol to 1,2,4-trihydroxybenzene via 1,4-benzenediol. 1,2,4-Trihydroxybenzene 1,2-dioxygenase cleaved the benzene ring of 1,2,4-trihydroxybenzene to form maleylacetic acid. The enzyme showed a high dioxygenase activity only for 1,2,4-trihydroxybenzene, with K m and V max values of 9.6 μM and 6.8 μmol min −1 mg of protein −1 , respectively.