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- W2415586120 abstract "Abstract The activity of δ-aminolevulinate dehydratase (E.C. 4.2.1.24) in crude extracts of the smut fungus Ustilago sphaerogena, grown in its sporidial stage, has been found to depend on the concentration of Zn++ in the culture media; half-maximal effect was at about 2 × 10−6 M. Dialysis of crude extracts did not result in the loss of enzyme activity, which might be expected if the enzyme is activated by reversible enzyme-Zn++ complex formation, and addition of Zn++in vitro had little effect up to 10−5 m. Higher concentrations of Zn++ were inhibitory in accord with the implication of essential SH in this enzyme as revealed by inhibition with Cu++ or iodoacetate. Attempts to obtain highly active enzyme by the addition of Zn++ to crude extracts from zinc-deficient cells were unsuccessful. The increase in the activity caused by the addition of Zn++ (3 × 10−5 m ) to a culture previously grown in the presence of low concentration of Zn++ (10−7 m ) was effectively inhibited by simultaneous addition of p-fluorophenylalanine (4.5 × 10−4 m ), but little inhibition was observed when actinomycin D (200 mg/ liter) was substituted for the amino acid analogue. Thus it appears that Zn++ is required for the synthesis of this enzyme protein at the translation level." @default.
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- W2415586120 date "1968-01-01" @default.
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- W2415586120 title "Effect of zinc ions on δ-aminolevulinate dehydratase in Ustilago sphaerogena" @default.
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- W2415586120 doi "https://doi.org/10.1016/0003-9861(68)90352-4" @default.
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