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The Transport of 3-Phosphoglycerate in Isolated Chloroplasts of the Green Seaweed Bryopsis corticulans Setch.

The transport of 3-phosphoglycerate (PGA) into isolated chloroplasts of the green seaweed Bryopsis corticulans was monitored as PGA-dependent O2 evolution in a CO2-free system. This O2 evolution was inhibited completely by 10mM pyrophosphate or 1.6mM pyridoxal-S'-phosphate. In contrast to pyrophosphate, the inhibition by pyridoxal-5'-phosphate occurred only when it was added to the reaction system before the onset of light. When PGA-dependent O2 evolution had already commenced the addition of pyridoxal-S'-phosphate had no inhibitory effect. These results suggest that the uptake of PGA by the chloroplasts is a carrier-mediated