Anaerobic degradation of 3-aminobenzoate by a newly isolated sulfate reducer and a methanogenic enrichment culture

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1992
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Schnell, Sylvia
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A new rod-shaped, gram-negative, non-sporing sulfate reducer, strain mAB1, was enriched and isolated from marine sediment samples with 3-aminobenzoate as sole electron and carbon source. Strain mAB1 degraded 3-aminobenzoate completely to CO 2 and NH 3 with stoichiometric reduction of sulfate to sulfide. Ceils contained carbon monoxide dehydrogenase, cytochromes, and sulfite reductase P582. Strain mAB1 degraded also benzoate, 4-aminobenzoate, hydroxybenzoates, and some aliphatic compounds. Besides sulfates, also sulfite was reduced with 3-aminobenzoate as electron donor, but not thiosulfate, sulfur, nitrate, or fumarate. The strain grew in sulfide-reduced mineral medium supplemented with 7 vitamins. Strain mAB1 was tentatively affiliated with the genus esulfobacterium. Experiments with dense cell supsensions showed benzoate accumulation during 3-aminobenzoate degradation under conditions of sulfate limitation or cyanide inhibition. 3-Aminobenzoate was activated to 3-aminobenzoyl-CoA by cell extracts in the presence of ATP, coenzyme A, and Mg 2+. Acitivity of 3-aminobenzoyl-CoA synthetase was 16 nmol per rain and mg protein, with a K M for 3-aminobenzoate lower than 50 gM. Cell extract of 3-aminobenzoate-grown cells activated also 3-hydroxybenzoate (31.7 nmol per rain and mg protein) and benzoate (2.3 nmol per min and mg protein), but not 2-aminobenzoate or 4-aminobenzoate. In the presence of NADH of NADPH, 3-aminobenzoyl-CoA was further metabolized to a not yet identified reduced product.
Freshwater enrichments with 3-aminobenzoate in the absence of an external electron acceptor led to a stable methanogenic enrichment culture consisting of three types of bacteria. 3-Aminobenzoate was degraded completely to COz and stoichiometric amounts of CH4, with intermediary acetate accumulation.

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570 Biowissenschaften, Biologie
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3-Aminobenzoate, Anaerobic degradation, Sulfate-reducing bacterium, Methanogenic enrichment culture, 3-Aminobenzoyl-CoA synthetase
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ISO 690SCHNELL, Sylvia, Bernhard SCHINK, 1992. Anaerobic degradation of 3-aminobenzoate by a newly isolated sulfate reducer and a methanogenic enrichment culture. In: Archives of Microbiology. 1992, 158(5), pp. 328-334. ISSN 0302-8933. eISSN 1432-072X. Available under: doi: 10.1007/BF00245361
BibTex
@article{Schnell1992Anaer-6693,
  year={1992},
  doi={10.1007/BF00245361},
  title={Anaerobic degradation of 3-aminobenzoate by a newly isolated sulfate reducer and a methanogenic enrichment culture},
  number={5},
  volume={158},
  issn={0302-8933},
  journal={Archives of Microbiology},
  pages={328--334},
  author={Schnell, Sylvia and Schink, Bernhard}
}
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