Antimycin A effect on the electron transport in chloroplasts of two Chlamydomonas reinhardtii strains
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Abstract
The effects of antimycin A on the redox state of plastoquinone and on electron donation to photosystem I (PS I) were studied in sulfur-deprived Chlamydomonas reinhardtii cells of the strains cc406 and 137c. We found that this reagent suppresses cyclic electron flow around PS I in the cc406 strain, whereas this inhibitory effect was completely absent in the 137c strain. In the latter strain, antimycin A induced rapid reduction of plastoquinone in the dark and considerably enhanced the rate of electron donation to P700 + in the dark. Importantly, neither myxothiazol, an inhibitor of mitochondrial respiration, FCCP, a protonophore, nor propyl gallate, an inhibitor of the plastid terminal oxidase, induced such a strong effect like antimycin A. The results indicate that in the chloroplast of the 137c strain, antimycin A has a site of action outside of the machinery of cyclic electron flow.
Keywords
Antimycin A Chlamydomonas Hydrogen Sulfur deprivationAbbreviations
- AA
Antimycin A
- DCMU3
3-(3,4-dichlorophenyl)-1,1-dimethylurea
- CEF
Cyclic electron flow around PS I
- FQR
Ferredoxin-quinone reductase
- Chl
Chlorophyll
- ETC
Electron transport chain
- FCCP
Carbonylcyanide-p-trifluoromethoxyphenyl-hydrazone
- Fd
Ferredoxin
- FNR
Ferredoxin-NADP reductase
- Mxt
Myxothyazol
- MV
Methyl viologen
- NDH
NADH dehydrogenase
- PPFD
Photosynthetic photon flux density
- PQ
Plastoquinon
- Pc
Plastocyanin
- PTOX
Plastid terminal oxidase
Notes
Acknowledgments
This study was supported by the Russian Federal Target Programme (8077) (TA, GK, TK). ET thanks European Regional Development Fund (Bio Refine Tech program) for financial support.
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