direct interaction between Photosystem I and the chloroplast coupling factor

A regulation of the ATP-synthesizing complex by electron-transport rate has been found. The site of regulation could be localized within the Photosystem I region. The regulatory effect probably is produced by direct interactions between neighbouring charged protein complexes. The primary result is a...

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Bibliographic Details
Published in:Biochemical journal 1986-02, Vol.234 (1), p.217-220
Main Authors: Huchzermeyer, B, Loehr, A, Willms, I
Format: Article
Language:English
Subjects:
Adenosine Diphosphate - metabolism
Adenosine Triphosphatases - antagonists & inhibitors
Adenosine Triphosphate - metabolism
Chlorophyll - metabolism
chloroplasts
Electron Transport - drug effects
interactions
Kinetics
Light-Harvesting Protein Complexes
Photosynthetic Reaction Center Complex Proteins
photosystem I
Photosystem I Protein Complex
Plant Proteins - metabolism
Plants - drug effects
Plants - metabolism
Proton-Translocating ATPases - metabolism
Protons
Spinacia oleracea
Tetramethylphenylenediamine - pharmacology
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Summary:A regulation of the ATP-synthesizing complex by electron-transport rate has been found. The site of regulation could be localized within the Photosystem I region. The regulatory effect probably is produced by direct interactions between neighbouring charged protein complexes. The primary result is an increase in the percentage of those binding sites adopting a low-affinity state. This seems to lead to an enhanced leakage of protons out of the thylakoids, especially under those experimental conditions employing low nucleotide concentrations. Changes in the P/2e ratio can be observed, especially if the total ADP + ATP concentration used in the experiment is below 200 microM.
ISSN:0264-6021
1470-8728
DOI:10.1042/bj2340217