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- W1600133349 abstract "Acetyl-coenzyme A:N-hydroxyarylamine O-acetyltransferase is ubiquitous in species ranging from bacteria to mammals and is involved in the metabolic activation of N-hydroxyarylamines derived from mutagenic and carcinogenic aromatic amines and nitroarenes. The nucleotide sequence of the gene that encodes O-acetyltransferase of Salmonella typhimurium was determined, and its deduced amino acid sequence was compared with those of arylamine N-acetyltransferases (EC 2.3.1.5) of higher organisms. The gene of S. typhimurium encoded a protein with a calculated molecular weight of 32,177. Chromosome DNA of S. typhimurium TA1538/1,8-DNP, an O-acetyltransferase-deficient strain, had a -1 frameshift mutation of CCC to CC at the coding region. To date, 11 genes encoding N-acetyltransferase have been cloned from human, rabbit, hamster, and chicken. The N-terminal region of O-acetyltransferase of S. typhimurium with about 170 amino acids showed 25-33% homology with the corresponding region of N-acetyltransferase of the higher organisms. Of the 5 cysteine residues of O-acetyltransferase of S. typhimurium, Cys69 was the only residue that was conserved in all N-acetyltransferases of the higher organisms. The amino acid sequence of Arg-Gly-Gly-X-Cys, including the Cys69, was highly conserved. The mutant O-acetyltransferase of S. typhimurium, which contained Ala69 instead of Cys69, no longer showed the activities of O- and N-acetyltransferase. These results suggest that the Cys69 of S. typhimurium and its corresponding cysteine residues of the higher organisms are essential for the enzyme activities as acetyl-coenzyme A-binding sites." @default.
- W1600133349 created "2016-06-24" @default.
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- W1600133349 date "1992-04-01" @default.
- W1600133349 modified "2023-10-13" @default.
- W1600133349 title "Involvement of Cys69 residue in the catalytic mechanism of N-hydroxyarylamine O-acetyltransferase of Salmonella typhimurium. Sequence similarity at the amino acid level suggests a common catalytic mechanism of acetyltransferase for S. typhimurium and higher organisms." @default.
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- W1600133349 doi "https://doi.org/10.1016/s0021-9258(18)42462-3" @default.
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