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From soil enrichment cultures four strains, using quinoline-4-carboxylic acid as sole source of energy and carbon, have been isolated. According to their physiological properties these bacteria have been identified as Microbacterium sp. designated H2, as Agrobacterium sp. designated 1b and Pimelobacter simplex designated 4B and 5B. Metabolites of the degradation pathway of quinoline-4-carboxylic acid have been isolated and identified. With Pimelobacter simplex 4B and 5B 2-oxo-1,2-dihydroquinoline-4-carboxylic acid and 8-hydroxycoumarin-4-carboxylic acid were isolated. The Agrobacterium strain accumulated 2-oxo-1,2-dihydroquinoline-4-carboxylic acid and 2-oxo-1,2,3,4-tetrahydroquinoline-4-carboxylic acid in the media during growth; with Microbacterium sp. H2 we only found 8-hydroxycoumarin-4-carboxylic acid. With mutants of Microbacterium sp. H2 which were induced with N-methyl-N'-nitro-N-nitrosoguanidine we found 2-oxo-1,2-dihydroquinoline-4-carboxylic acid, 8-hydroxy-coumarin-4-carboxylic acid and 2,3-dihydroxyphenyl-succinic acid.

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Microbial Metabolism of Quinoline and Related Compounds. XI. Degradation of Quinoline-4-carboxylic Acid by  Microbacterium  sp. H2,  Agrobacterium  sp. 1B and  Pimelobacter simplex  4B and SB