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. 1988 Jul;54(7):1791–1794. doi: 10.1128/aem.54.7.1791-1794.1988

Mechanism for nitrosation of 2,3-diaminonaphthalene by Escherichia coli: enzymatic production of NO followed by O2-dependent chemical nitrosation.

X B Ji 1, T C Hollocher 1
PMCID: PMC202747  PMID: 3046492

Abstract

The mechanism by which Escherichia coli can catalyze the nitrite-dependent nitrosation of 2,3-diaminonaphthalene (DAN), with formation of the corresponding fluorescent triazole, was studied. The reaction was dependent on production of a gaseous compound which can nitrosylate DAN upon contact with air. This compound was identified as nitric oxide (NO), and the kinetics of NO and triazole production are reported. NO and triazole were produced proportionally in a stoichiometric ratio, NO/triazole, of 1.4 to 1.7. Given the requirement for air, nitrosation of DAN probably proceeds via formation of the well-known strong nitrosylating agents N2O3 and N2O4 from NO. The parallel inhibition of NO and triazole production by azide and nitrate served to reinforce the link between nitrosation and nitrate reductase that had been established previously by others on genetic grounds.

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Selected References

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