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- W1985289905 abstract "The formation of S-[2-(N7-guanyl)ethyl]glutathione (GEG) from dihaloethanes is postulated to occur through two intermediates: the S-(2-haloethyl)glutathione conjugate and the corresponding episulfonium ion. We report the formation of GEG when deoxyguanosine (dG) was incubated with chemically synthesized S-(2-chloroethyl)glutathione (CEG). The depurination of GEG was shown to be first order with a half-life of 7.4 +/- 0.4 h at 27 degrees C. Evidence is also presented for the formation of S-[2-(N7-guanyl)ethyl]-L-cysteine (GEC) in incubation mixtures containing dG and S-(2-chloroethyl)-L-cysteine (CEC), the corresponding cysteine conjugate of CEG. This finding demonstrates that this (haloethyl)cysteine conjugate does not require activation by enzymatic action of cysteine conjugate beta-lyase but, instead, can directly alkylate DNA. The half-life of the depurination of GEC was 6.5 +/- 0.9 h, which is no different from that of GEG. Of the two conjugates, CEC is a somewhat more active alkylating agent toward dG than CEG as N7-guanylic adduct was detected in reaction mixtures with lower concentrations of CEC than with CEG." @default.
- W1985289905 created "2016-06-24" @default.
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- W1985289905 date "1987-04-07" @default.
- W1985289905 modified "2023-09-26" @default.
- W1985289905 title "Formation of S-[2-(N7-guanyl)ethyl] adducts by the postulated S-(2-chloroethyl)cysteinyl and S-(2-chloroethyl)glutathionyl conjugates of 1,2-dichloroethane" @default.
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- W1985289905 doi "https://doi.org/10.1021/bi00381a035" @default.
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