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J. Biol. Chem., Vol. 261, Issue 24, 10957-10959, 08, 1986

Metallothionein turnover in mammalian cells. Implications in metal toxicity

BP Monia, TR Butt, DJ Ecker, CK Mirabelli and ST Crooke

Metallothioneins are low molecular weight, cysteine-rich proteins believed to participate in metal detoxification. Turnover of Cd-, Zn-, and Au-induced metallothionein was studied in a Chinese hamster ovary cell line which was resistant to Cd and the Au-containing drug auranofin. Cd, Zn, and Au were potent inducers of metallothionein mRNA and resulted in accumulation of approximately equal amounts of mRNA. Pulse-chase studies with [35S]cysteine revealed that the half-life of Au-, Zn-, and Cd-induced metallothionein was 0.75, 10, and 24 h, respectively. The differences in the half-life of metallothionein may be related to the tertiary structure of metal-metallothionein complexes. These results have implications in the mechanism of resistance to gold compounds.
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