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- W2071774543 abstract "The distribution of the glutathionyl moiety between reduced and oxidized forms in rat plasma was markedly different than that for the cysteinyl moiety. Most of the glutathionyl moiety was present as mixed disulfides with cysteine and protein whereas most of the cysteinyl moiety was present as cystine. Seventy percent of total glutathione equivalents was bound to proteins in disulfide linkage. The distribution of glutathione equivalents in the acid-soluble fraction was 28.0% as glutathione, 9.5% as glutathione disulfide, and 62.6% as the mixed disulfide with the cysteinyl moiety. In contrast, 23% of total cysteine equivalents was protein-bound. The distribution of cysteine equivalents in the acid-soluble fraction was 5.9% as cysteine, 83.1% as cystine, and 10.8% as the mixed disulfide with the glutathionyl moiety. A first-order decline in glutathione occurred upon in vitro incubation of plasma and was due to increased formation of mixed disulfides of glutathione with cysteine and protein. This indicates that plasma thiols and disulfides are not at equilibrium, but are in a steady-state maintained in part by transport of these compounds between tissues during the interorgan phase of their metabolism. The large amounts of protein-bound glutathione and cysteine provide substantial buffering which must be considered in analysis of transient changes in glutathione and cysteine. In addition, this buffering may protect against transient thiol-disulfide redox changes which could affect the structure and activity of plasma and plasma membrane proteins." @default.
- W2071774543 created "2016-06-24" @default.
- W2071774543 creator A5030738786 @default.
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- W2071774543 date "1985-08-01" @default.
- W2071774543 modified "2023-10-15" @default.
- W2071774543 title "Distribution of oxidized and reduced forms of glutathione and cysteine in rat plasma" @default.
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- W2071774543 doi "https://doi.org/10.1016/0003-9861(85)90065-7" @default.
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