Abstract
It has been shown that removal of manganese from the water-oxidizing complex (WOC) of photosystem II (PSII) leads to flash-induced oxygen consumption (FIOC) which is activated by low concentration of Mn2+ (Yanykin et al., Biochim Biophys Acta 1797:516–523, 2010). In the present work, we examined the effect of transition and non-transition divalent metal ions on FIOC in Mn-depleted PSII (apo-WOC-PSII) preparations. It was shown that only Mn2+ ions are able to activate FIOC while other transition metal ions (Fe2+, V2+ and Cr2+) capable of electron donation to the apo-WOC-PSII suppressed the photoconsumption of O2. Co2+ ions with a high redox potential (E 0 for Co2+/Co3+ is 1.8 V) showed no effect. Non-transition metal ions Ca2+ by Mg2+ did not stimulate FIOC. However, Ca2+ (in contrast to Mg2+) showed an additional activation effect in the presence of exogenic Mn2+. The Ca2+ effect depended on the concentration of both Mn2+ and Ca2+. The Ca effect was only observed when: (1) the activation of FIOC induced by Mn2+ did not reach its maximum, (2) the concentration of Ca2+ did not exceed 40 μM; at higher concentrations Ca2+ inhibited the Mn2+-activated O2 photoconsumption. Replacement of Ca2+ by Mg2+ led to a suppression of Mn2+-activated O2 photoconsumption; while, addition of Ca2+ resulted in elimination of the Mg2+ inhibitory effect and activation of FIOC. Thus, only Mn2+ and Ca2+ (which are constituents of the WOC) have specific effects of activation of FIOC in apo-WOC-PSII preparations. Possible reactions involving Mn2+ and Ca2+ which could lead to the activation of FIOC in the apo-WOC-PSII are discussed.
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Abbreviations
- PSII:
-
Photosystem II
- RC:
-
Reaction center
- WOC:
-
Water-oxidizing complex
- Apo-WOC-PSII:
-
Photosystem II membrane fragments deprived of the WOC
- Cytb 559 :
-
Cytochrome b 559
- Pheo:
-
Pheophytin—the primary electron acceptor of PSII
- P680 :
-
The primary electron donor of PSII
- Q A :
-
The primary plastoquinone electron acceptor of PSII
- Q B :
-
The secondary plastoquinone electron acceptor of PSII
- TyrZ:
-
Redox active tyrosine residue 161 of D1 protein
- DPC:
-
Diphenylcarbazide
- ΔF:
-
Photoinduced changes of chlorophyll fluorescence yield of PSII
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Acknowledgments
This work was supported by the Russian Foundation of Basic Research (12-04-31166, 12-04-90044, 11-04-00523) and MCB RAS.
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Yanykin, D.V., Khorobrykh, A.A., Khorobrykh, S.A. et al. Flash-induced consumption of molecular oxygen on the donor side of photosystem II in Mn-depleted subchloroplast membrane fragments: specific effects of manganese and calcium ions. Photosynth Res 117, 367–374 (2013). https://doi.org/10.1007/s11120-013-9868-4
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DOI: https://doi.org/10.1007/s11120-013-9868-4