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J Bacteriol. 1975 December; 124(3): 1077-1083

Metabolism of phenol and cresols by Bacillus stearothermophilus.

ABSTRACT

An obligate thermophilic strain of Bacillus stearothermophilus, strain PH24, isolated from industrial sediment by elective culture, grew readily at 55 C on phenol or on one of the isomers of cresol as the major carbon source. Intact cells grown in the presence of phenol, o-cresol, m-cresol, or p-cresol were induced to oxidize, without lag, these substrates together with catechol, 3-methylcatechol, and 4-methylcatechol. Cell extracts prepared from B. stearothermophilus PH24 after growth in the presence of phenol converted phenol to catechol with a concomitant uptake of 1 mol of oxygen per mol of substrate in reaction mixtures supplemented with reduced nicotinamide adenine dinucleotide. These preparations also catalyzed the oxidation of o-cresol to 3-methylcatechol and of m-cresol and p-cresol to 4-methylcatechol. Enzyme activity was inhibited by 1 mM p-chloromercuribenzoate and by 0.1 mM 0-phenanthroline. Catechol and the corresponding methylcatechol intermediates were further dissimilated by cell extracts of phenol-grown cells via the meta-cleavage route to yield 2-hydroxymuconic semialdehyde and the respective methylated derivatives.

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