Abstract
Nocardia sp. DSM 1069 was grown on mineral salt media with coniferyl alcohol, 4-methoxybenzoic acid, 3-methoxybenzoic acid or veratric acid as sole sources of carbon and energy. During incubation on coniferyl alcohol, the formation of coniferyl aldehyde, ferulic acid and quantitative accumulation of vanillic acid and proteocatechuic acid could be achieved with mutants. Washed cell suspensions of N. sp. grown on 4-methoxybenzoic acid, oxidized 4-hydroxybenzoic acid and protocatechuic acid. Cells grown on veratric acid, oxidized vanillic acid, isovanillic acid, and protocatechuic acid. Cell extracts were shown to cleave protocatechuic acid by “ortho-fission”.
A mutant without protocatechuate 3,4-dioxygenase activity was not influenced in its growth on 3 methoxybenzoic acid. Cell free extracts of cells grown on 3-methoxybenzoic acid were shown to catalyze the oxidation of gentisic acid (2,5-dihydroxybenzoic acid). The resulting ring cleavage product was further metabolized by a glutathione dependent reaction.
The specificity of the demethylation reactions has been investigated with a mutant unable to grow on vanillic acid. This mutant was not impaired in the degradation of isovanillic acid, 4-methoxy-, or 3-methoxybenzoic acid, whereas growth of this mutant on veratric acid (3,4-dimethoxybenzoic acid) was only half as much as that of the wild type. Concomitantly with growth on veratric acid this mutant accumulated vanillic acid with a yield of about 50%.
A pathway for the catabolism of coniferyl alcohol, involving oxidation and shortening of the side chain, and of 4-methoxybenzoic acid and veratric acid with protocatechuic acid as intermediate is being proposed. A second one is proposed for the degradation of 3-methoxybenzoic acid with gentisic acid as intermediate.
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Eggeling, L., Sahm, H. Degradation of coniferyl alcohol and other lignin-related aromatic compounds by Nocardia sp. DSM 1069. Arch. Microbiol. 126, 141–148 (1980). https://doi.org/10.1007/BF00511219
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DOI: https://doi.org/10.1007/BF00511219