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Influence of calcium ion on photosystem II oxygen evolution

Hou‐Guo Liang

1995Biochemistry, Genetics and Molecular Biology被引 3

摘要

Treatment of photosystem Ⅱ particles with NaCl-washings,low-pH washings or detergent OG-solubilizings inhibited oxygen evolution and the inhibition was reversed by addition of exogenous Ca~(2+). Dynamic analysis with Ca~(2+)reconstitution revealed two Ca~(2+)binding sites with different affinities in the NaCl-washed PS Ⅱ particles or in the low-pH-treated ones.Oxygen-evolving PS Ⅱ core complex also con- tained the high and low affinity Ca~(2+)binding sites.Ca~(2+)enhanced the intensity of fluorescence emission of PS Ⅱ core complex.These results suggest that calcium play two roles in PS Ⅱ,the low affinity Ca~(2+)is associ- ated with energy transfer while the high affinity Ca~(2+)is concerned with water splitting reaction.

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