Abstract
Calcium ions play an important role in the oxygen-evolving process of photosystem II as demonstrated in many experiments. The changes of the secondary structures of PS II induced by the depletion of Ca2+ were reported. The results indicated that the removal of Ca2+ led to the transition of ahelix to turns and sheet structures. While Ca2+ was re-added to the media, only the structures changed to turns could be recovered. The protein conformational changes of PS II during the donor side photoinhibition induced by the depletion of ca2+ were also studied. This showed that the protein conformational changes differed between the control and Ca2+-depleted samples in a short period of illumination (within 10 min). However, the changes became similar when the illumination time was increased.
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