Journal
CHINESE SCIENCE BULLETIN
Volume 53, Issue 2, Pages 317-320Publisher
SCIENCE PRESS
DOI: 10.1007/s11434-008-0064-4
Keywords
photosystem I; monomerization; trimerization; H+
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H+ concentration induced-monomerization or trimerization of photosystem I (PSI) in cyanobacteria has never been directly observed. In this work, taking characteristic spectra for the trimers and monomers as the indicators, it was experimentally demonstrated that H+ could induce the oligomeric changes of PSI reaction centers in the intact Spirulina platensis cells and also in the isolated thylakoid membrane complexes. Especially, the higher concentration of H+ would induce the monomerization while the lower the trimerization, suggesting the electrostatic interaction should be mainly responsible for changes in the oligomeric state of PSI in Spirulina platensis.
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