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The phosphate translocator protein of C(3) and C(4) mesophyll chloroplast envelopes was specifically labeled using the anion exchange inhibitor, 1,2-ditritio-1,2-(2,2' -disulfo-4,4' -diisothiocyano) diphenylethane ([(3)H](2)-DIDS). Intact mesophyll chloroplasts were isolated from the C(3) plants, Spinacia oleracea L. (spinach) and Pisum sativum L. (pea), and the C(4) plant, Zea mays L. (corn). Chloroplasts were incubated with 5 to 50 mum [(3)H](2)-DIDS and, in addition, pea chloroplasts were also incubated with pyridoxal phosphate/tritiated sodium borohydride. The chloroplasts were washed, the envelopes isolated and solubilized. Following sodium dodecyl sulfate polyacrylamide gel electrophoresis, label from bound [(3)H](2)-DIDS was detected only in the 28- to 30-kilodalton protein (proposed C(3) phosphate translocator) for both C(3) and C(4) chloroplasts, as demonstrated by fluorography. In contrast, when pyridoxal phosphate/tritiated sodium borohydride was used to label pea chloroplasts, radioactivity was detected in several other bands in addition to the 29-kilodalton polypeptide. These findings suggest that DIDS is a much more specific inhibitor than reagents previously employed to study the phosphate translocator and could be used to isolate and characterize the differences in the C(3) and C(4) phosphate translocator protein(s).

plant physiology

Specific Labeling of the Phosphate Translocator in C<sub>3</sub> and C<sub>4</sub> Mesophyll Chloroplasts by Tritiated Dihydro-DIDS (1,2-Ditritio-1,2-[2,2′ -Disulfo-4,4′ -Diisothiocyano] Diphenylethane)

Specific Labeling of the Phosphate Translocator in C3 and C4 Mesophyll Chloroplasts by Tritiated Dihydro-DIDS (1,2-Ditritio-1,2-[2,2′ -Disulfo-4,4′ -Diisothiocyano] Diphenylethane)

Specific Labeling of the Phosphate Translocator in C₃ and C₄ Mesophyll Chloroplasts by Tritiated Dihydro-DIDS (1,2-Ditritio-1,2-[2,2′ -Disulfo-4,4′ -Diisothiocyano] Diphenylethane)