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- W1503438757 abstract "Abstract Dioxygenases that catalyze the cleavage of the aromatic ring are classified into two groups according to their mode of ring fission. Substrates of ring-cleavage dioxygenases usually contain hydroxyl groups on adjacent aromatic carbons, and intradiol enzymes cleave the ring between these two hydroxyl groups. Extradiol enzymes in contrast cleave the ring between one hydroxylated carbon and its adjacent nonhydroxylated carbon. In this study, we determined the complete nucleotide sequence of nahC, the structural gene for 1,2-dihydroxynaphthalene dioxygenase encoded in the NAH7 plasmid of Pseudomonas putida. This enzyme is an extradiol ring-cleavage enzyme that cleaves the first ring of 1,2-dihydroxynaphthalene. The amino acid sequence of the dioxygenase deduced from the DNA sequence demonstrated that the molecular weight of the enzyme is 33,882. This result was in agreement with those of maxicell analyses that showed that the nahC product was a 36-kDa protein. Interestingly, the amino acid sequence of 1,2-dihydroxynaphthalene dioxygenase was 50% homologous with that of 2,3-dihydroxybiphenyl dioxygenase, which catalyzes extradiol cleavage of the first ring of 2,3-dihydroxybiphenyl (Furukawa, K., Arimura, N., and Miyazaki, T. (1987) J. Bacteriol. 169, 427-429). The amino acid sequence similarity of 1,2-dihydroxynaphthalene dioxygenase with catechol 2,3-dioxygenase, which is an authentic extradiol dioxygenase, was rather low (16%). However, a statistical analysis by the method of S. B. Needleman and C. D. Wunsch [1970) J. Mol. Biol. 48, 443-453) clearly showed that these two dioxygenases are evolutionarily related. Therefore, these extradiol enzymes are considered as products of the same gene superfamily. From the significant sequence similarity between intradiol enzymes, it has been shown (Neidle, E. L., Harnett, C., Bonitz, S., and Ornston, L. N. (1988) J. Bacteriol. 170, 4874-4880) that intradiol enzymes evolved from a common ancestor. Comparison of the amino acid sequence of extradiol enzymes with those of intradiol dioxygenases did not show any significant global or localized similarity." @default.
- W1503438757 created "2016-06-24" @default.
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- W1503438757 date "1989-09-01" @default.
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- W1503438757 title "Bacterial aromatic ring-cleavage enzymes are classified into two different gene families" @default.
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- W1503438757 doi "https://doi.org/10.1016/s0021-9258(19)84830-5" @default.
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