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. 1979 Apr;63(4):635-8.
doi: 10.1104/pp.63.4.635.

Energy-linked Sulfate Uptake by Corn Mitochondria via the Phosphate Transporter

S Abou-Khalil  1 , J B Hanson
Affiliations

Energy-linked Sulfate Uptake by Corn Mitochondria via the Phosphate Transporter

S Abou-Khalil et al. Plant Physiol. 1979 Apr.

Abstract

Corn shoot mitochondria possess an energy-linked transport system for sulfate uptake as demonstrated by osmotic swelling and [(35)S]SO(4) (2-) accumulation. Maximum uptake is secured in the presence of Mg(2+) and oligomycin with sucrose for osmotic support. Neither phosphate nor dicarboxylate anions are required. When added simultaneously, millimolar concentrations of phosphate block [(35)S]SO(4) (2-) uptake after the initial minute. Mersalyl, N-ethylmaleimide, and 2,4-dinitrophenol are strong inhibitors of sulfate uptake; n-butylmalonate is a weak inhibitor. These inhibitors act in the same fashion on phosphate uptake. It is concluded that sulfate uptake in the absence of phosphate is by the phosphate transporter.

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References

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