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. 1981 Sep;68(3):610–615. doi: 10.1104/pp.68.3.610

The Coupling of Electron Flow to ATP Synthesis in Pea and Maize Mesophyll Chloroplasts 1,2

I. INTERACTION OF ADENINE NUCLEOTIDES AND ENERGY TRANSFER INHIBITORS WITH THE COUPLING FACTOR COMPLEX

Richard M Cole 1,3, Wendy A Macpeek 1, William S Cohen 1
PMCID: PMC425948  PMID: 16661966

Abstract

The rate of nonphosphorylating electron transport (in the absence of ADP and inorganic phosphate) in well-coupled (ATP/2e− = 0.9-1.1) maize mesophyll chloroplasts is not modulated by external pH (6.5-8.5), low levels of ADP or ATP, or energy transfer inhibitors, e.g. triphenyltin and Hg2+ ions. In contrast nonphosphorylating electron flow in pea chloroplasts is sensitive to alterations in medium pH, and to the presence of adenine nucleotides and energy transfer inhibitors in the assay medium. Although ATP is without effect on the rate of basal electron transport in maize chloroplasts, steady-state proton uptake is stimulated 3- to 5-fold by low levels of ATP. These results suggest that differences may exist in the manner in which the coupling factor complex controls proton efflux from the intrathylakoid space in C3 and C4 mesophyll chloroplasts.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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