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An adenine nucleotide-phosphoenolpyruvate counter-transport system in C3 and C4 plant chloroplasts



An adenine nucleotide-phosphoenolpyruvate counter-transport system in C3 and C4 plant chloroplasts



Biochemical and Biophysical Research Communications 116(3): 945-951



A rapid counter-exchange between ATP and phosphoenolpyruvate (PEP) has been demonstrated in pea and maize mesophyll chloroplasts. Chloroplasts preloaded with either [14C] ATP or [14C] PEP readily exchange the radioactive compound with the externally added anions, ATP or PEP, whereas, cold external Pi counter-transports only with internal [14C] PEP. Flooding the system with cold Pi, however, will significantly reduce the counter-transport of external cold PEP with internal [14C] ATP. This ATP-PEP exchange is also markedly decreased by lowering the incubation temperature. The results indicate that the ATP-PEP counter-exchange could represent a key transport system in plant chloroplasts and may be particularly important in the photosynthesis of C4 plants. Furthermore, they provide information required to elucidate the mechanism of the ATP-PEP counter-transport system.

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Accession: 015009454

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PMID: 6316974

DOI: 10.1016/s0006-291x(83)80233-2


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