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D1 polypeptide degradation may regulate psbA gene expression at transcriptional and translational levels in Synechocystis sp. PCC 6803

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Abstract

Light has been suggested to regulate both synthesis and degradation of the Photosystem II (PS II) reaction centre polypeptide D1, encoded by the psbA gene. The modified degradation rate of the D1 polypeptide in site-directed Synechocystis sp PCC 6803 D1 mutants CA1 [del(E242-E244);Q241H], E243K and E229D has provided a tool to determine whether the rate of D1 polypeptide synthesis is directly regulated by light-intensity-related factors or by a control mechanism mediated by light-dependent degradation of the D1 polypeptide. In vivo accumulation of [35S] methionine into the D1 polypeptide was found to correlate with D1 polypeptide degradation rather than with incident irradiance. This suggests that the degradation rate of the D1 polypeptide regulates its own synthesis at translational level. Furthermore, several fold differences in the psbA mRNA levels were measured between D1 mutant strains, indicating that the psbA gene transcription is not solely under light control.

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Abbreviations

Chl:

chlorophyll

DCBQ:

2,6-dichloro-p-benzoquinone

MW:

molecular weight

SDS-PAGE:

sodium dodecyl sulfate polyacrylamide gel electrophoresis

PPFD:

photosynthetic photon flux density

PS II:

Photosystem II

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Tyystjärvi, T., Mulo, P., Mäenpää, P. et al. D1 polypeptide degradation may regulate psbA gene expression at transcriptional and translational levels in Synechocystis sp. PCC 6803. Photosynth Res 47, 111–120 (1996). https://doi.org/10.1007/BF00016174

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  • DOI: https://doi.org/10.1007/BF00016174

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