A specific transport system with high affinity for magnesium ions has been discovered in Escherichia coli. Experiments with 28Mg provided evidence that both uptake of radioactive magnesium into cells and the exit of magnesium from cells are mediated processes. The uptake of magnesium is greatly reduced when the cells are chilled to 0° or treated with sulfhydryl poisons such as N-ethylmaleimide. The exit of radioactive magnesium from cells previously grown on 28Mg takes place only in the presence of a pool of external unlabeled magnesium, and is also blocked by chilling and by treatment with N-ethylmaleimide.
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Lusk et al. (1969) studied this question.
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