Abstract
Rats excrete increased ethylmalonate and methylsuccinate when given ethylmalonate in the diet; when given methylsuccinate they excrete methylsuccinate and mesaconate. Tenfold more labelled mesaconate was produced from threo-methyl[2,3-2H2] succinate precursor than from the erythro isomer. Our findings suggest trans-dehydrogenation of methylsuccinate and are the first direct evidence linking the metabolism of ethylmalonate, methylsuccinate and mesaconate.
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