M Parekh, H L Drake, S L Daniel
Index: Lett. Appl. Microbiol. 22(2) , 115-20, (1996)
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Desulfovibrio desulfuricans ATCC 27774 was screened for reactivity against aromatic compounds during lactate-dependent, nitrate-dissimilating growth. Only aromatic aldehydes (benzaldehyde, 2-hydroxybenzaldehyde, 3-hydroxybenzaldehyde, 4-hydroxybenzaldehyde, vanillin, iso-vanillin and o-vanillin) were reactive and, with the exception of 2-hydroxybenzaldehyde, were stimulatory to lactate-dependent growth. Aromatic aldehydes were transformed to their corresponding benzoate and benzyl alcohol derivatives, with the ratio of benzoate-to-benzyl alcohol derivatives being dependent upon lactate availability. In presence of lactate, aromatic aldehydes were primarily reduced to their corresponding benzyl alcohol derivatives; in the absence of lactate, aromatic aldehydes were mainly oxidized to their corresponding benzoate derivatives. In the absence of nitrate, 3-hydroxybenzaldehyde was neither reduced nor oxidized. These results indicate that D. desulfuricans is competent in the bidirectional transformation of aromatic aldehydes under nitrate-dissimilating conditions and that the direction of transformation (i.e. reduction or oxidation) is regulated by reductant availability.
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