Abstract
The previously constructed MSP (manganese stabilizing protein-psbO gene product)-free mutant of Synechococcus PCC7942 (Bockholt R, Masepohl B and Pistorius E K (1991) FEBS Lett 294: 59–63) and a newly constructed MSP-free mutant of Synechocystis PCC6803 were investigated with respect to the inactivation of the water-oxidizing enzyme during dark incubation. O2 evolution in the MSP-free mutant cells, when measured with a sequence of short saturating light flashes, was practically zero after an extended dark adaptation, while O2 evolution in the corresponding wild type cells remained nearly constant. It could be shown that this inactivation could be reversed by photoactivation. With isolated thylakoid membranes from the MSP-free mutant of PCC7942, it could be demonstrated that photoactivation required illumination in the presence of Mn2+ and Ca2+, while Cl− addition was not required under our experimental conditions. Moreover, an extended analysis of the kinetic properties of the water-oxidizing enzyme (kinetics of the S3→(S4)→S0 transition, S-state distribution, deactivation kinetics) in wild type and mutant cells of Synechococcus PCC7942 and Synechocystis PCC6803 was performed, and the events possibly leading to the reversible inactivation of the water-oxidizing enzyme in the mutant cells are discussed. We could also show that the water-oxidizing enzyme in the MSP-free mutant cells is more sensitive to inhibition by added NH4Cl-suggesting that NH3 might be a physiological inhibitor of the water oxidizing enzyme in the absence of MSP.
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Abbreviations
- Chl:
-
chlorophyll
- DCBQ:
-
2,6-Dichloro-p-benzoquinone
- MSP:
-
manganese stabilizing protein (psbO gene product)
- PS II:
-
Photosystem II
- WOE:
-
water oxidizing enzyme
- WT:
-
wild type
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This paper is dedicated to Prof. Dr. Bernard Axelrod on the occasion of his 80th birthday
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Engels, D.H., Lott, A., Schmid, G.H. et al. Inactivation of the water-oxidizing enzyme in manganese stabilizing protein-free mutant cells of the cyanobacteria Synechococcus PCC7942 and Synechocystic PCC6803 during dark incubation and conditions leading to photoactivation. Photosynth Res 42, 227–244 (1994). https://doi.org/10.1007/BF00018265
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DOI: https://doi.org/10.1007/BF00018265