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Formation, stability, and rearrangements of the glutathione conjugates of butadiene monoxide: evidence for the formation of stable sulfurane intermediates.

Abstract：

:Butadiene monoxide, a toxic metabolite of 1,3-butadiene, is a substrate for the human placental glutathione (GSH) S-transferase. The products have been identified as S-(2-hydroxy-3-buten-1-yl)glutathione (I) and S-(1-hydroxy-3-buten-2-yl)glutathione (II). S-(4-hydroxy-2-buten-1-yl)glutathione (III), which was formed chemically, was not detected. 1H NMR analysis of II was consistent with its structure, but spectra of I indicated a 1:1 equilibrium between I and the sulfurane tautomer (IVB) formed by intramolecular displacement of the hydroxyl group by the sulfur atom. The ratio of I to IVB did not change whether the spectrum was obtained at pH 3, 7, or 9 in the presence or absence of LiClO4. Incubations of I at pH 7 or 9 for 5 days at 25 degrees C or for 7 h at 50 degrees C, in the presence or absence of nucleophiles plus LiClO4, did not affect the HPLC profile of I. Storage of I at -20 degrees C for 30 weeks, reflux at pH 7.8 for 5 h in the presence of GSH, or incubations at pH 2 for 5 h at 55 degrees C in the presence of GSH or 2-mercaptoethanol, however, resulted in the conversion of I to III (10-30%). Treatment of I with H2O2 resulted in formation of the corresponding sulfoxide (V) and sulfone (VI), which blocked the formation of III. NMR and chemical reactivity studies of III indicated an initial 1:1 equilibrium between III and the five-membered ring sulfurane (VIIB) formed by intramolecular displacement of the hydroxyl group by the sulfur atom.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Chem Res Toxicol

journal_title

Chemical research in toxicology

authors

Sharer JE,Duescher RJ,Elfarra AA

doi

10.1021/tx00022a006

subject

Has Abstract

pub_date

1991-07-01 00:00:00

pages

430-6

issue

4

eissn

0893-228X

issn

1520-5010

journal_volume

4

pub_type

杂志文章

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