A direct interaction between photosytem I and the chloroplast coupling factor

A regulation of the ATP-synthesizing complex by electron-trnasport 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 1986-01, Vol.234 (1), p.217-220
Main Authors: Huchzermeyer, B, Loehr, A, Willms, I
Format: Article
Language:English
Subjects:
chloroplasts
coupling factors
photosystem I
Spinacea oleracea
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Summary:A regulation of the ATP-synthesizing complex by electron-trnasport 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 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 mu M.
ISSN:0264-6021