Add time:09/09/2019         Source:sciencedirect.com

Acid protease inhibitor 1,2-epoxy-3-(p-nitrophenoxy)propane (ENPP) is commonly used in research as a substrate for glutathione-S-transferase activity (GST) and recently was found to inhibit human immunodeficiency virus 1 (HIV-1) protease. The question of DNA-adduct formation and mutagenicity was investigated and found that ENPP causes DNA damage and acts directly to induce mutagenicity in Salmonella. Using HPLC analysis, ENPP was shown to bind covalently to guanine residues. The Salmonella mutagenicity assay indicated that ENPP enhanced the mutation frequencies in the base-substitution strain TA00 by more than 20 times above the background. Its mutagenic potency was comparable to that of well-known carcinogens, N-methyl-N-nitrosourea (MNU) and aflatoxin B1-8,9-epoxide (AFB1-8,9-epoxide). The results suggest that ENPP should be classified as a mutagenic compound and a potential carcinogen.

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