Specific loss of the extrinsic 18 KDa protein from Photosystem II upon heating to 47 °C causes inactivation of oxygen evolution likely due to Ca release from the Mn-complex
作者： Marcos Barra , Michael Haumann , Holger Dau
DOI: 10.1007/S11120-004-7158-X
关键词:
摘要: Exposure of Photosystem II (PS II) membrane particles from spinach to a temperature 47 °C caused the rapid release 18 kDa protein in parallel inactivation oxygen evolution. Previously, it has been suggested that first heat-jump response involves Ca Mn complex O2-evolution, followed by slower (2 + 2) Mn II ions [Pospisil P et al. (2003) Biophys J 84: 1370–1386]. Here, predicted biphasic bulk was verified atomic absorption spectroscopy (AAS). Analysis laser flash-induced delayed fluorescence transients suggests loss essential ion Mn4Ca dark is due protein. The S2-state multiline EPR signal still generated heat-treated PS presumably lacking Ca, but retaining four ions.
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