Role of two forms of the D1 protein in the recovery from photoinhibition of photosystem II in the cyanobacterium Synechococcus PCC 7942

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Abstract

The study of turnover of two distinct forms of the photosystem II (PSII) D1 protein in cells of the cyanobacterium Synechococcus PCC 7942 showed that the 'high-light' form D1:2 is degraded significantly faster at 500 μE m-2 s-1 as compared with 50 μE m-2 s-1 while the degradation rates of the 'low-light' form D1:1 under low and high irradiance are not substantially different. Consequently, the D1:1 turnover does not match photoinactivation of PSII under increased irradiance and therefore the cells containing this D1 form exhibit a decrease in the PSII activity. Monitoring of the content of each D1 form during a recovery from growth-temperature photoinhibition showed a good correlation between the synthesis of D1:2 and restoration of the PSII activity. In contrast, when photoinhibitory treatment was conducted at low temperature, a fast recovery was not accompanied by the D1:2 accumulation. The data suggest that photoinactivation at growth temperature results in a modification of PSII that inhibits insertion of D1:1 and, therefore, for restoration of the photochemical activity in the photoinactivated PSII complexes the D1:2 synthesis is needed. This may represent the primary reason for the requirement of psbAII/psbAIII expression under increased irradiance. Copyright (C) 2000 Elsevier Science B.V.

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APA

Komenda, J. (2000). Role of two forms of the D1 protein in the recovery from photoinhibition of photosystem II in the cyanobacterium Synechococcus PCC 7942. Biochimica et Biophysica Acta - Bioenergetics, 1457(3), 243–252. https://doi.org/10.1016/S0005-2728(00)00105-5

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