A 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 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.
Huchzermeyer
B
B
Loehr
A
A
Willms
I
I
D000244:Adenosine Diphosphate / Q000378:metabolism; D000251:Adenosine Triphosphatases / Q000037:antagonists & inhibitors; D000255:Adenosine Triphosphate / Q000378:metabolism; D002734:Chlorophyll / Q000378:metabolism*; D004579:Electron Transport / Q000187:drug effects; D007700:Kinetics; D045342:Light-Harvesting Protein Complexes; D045322:Photosynthetic Reaction Center Complex Proteins; D045331:Photosystem I Protein Complex; D010940:Plant Proteins / Q000378:metabolism*; D010944:Plants / Q000187:drug effects / Q000378:metabolism*; D006180:Proton-Translocating ATPases / Q000378:metabolism*; D011522:Protons; D013772:Tetramethylphenylenediamine / Q000494:pharmacology
D045342:Light-Harvesting Protein Complexes; D045322:Photosynthetic Reaction Center Complex Proteins; D045331:Photosystem I Protein Complex; D010940:Plant Proteins; D011522:Protons; D002734:Chlorophyll; D000244:Adenosine Diphosphate; D000255:Adenosine Triphosphate; D000251:Adenosine Triphosphatases; D006180:Proton-Translocating ATPases; D013772:Tetramethylphenylenediamine