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• W1503041385 startingPage "959" @default.
• W1503041385 abstract "The three psbA genes in the cyanobacterium Synechococcus sp. strain PCC 7942 encode two distinct forms of the D1 protein of photosystem II. The psbAI message, which encodes form I, dominates the psbA transcript pool at low to moderate light intensities; however, exposure to high light triggers a response in which the psbAI message is actively degraded while psbAII and psbAIII, which encode form II, are transcriptionally induced. We addressed whether these changes result from a generalized stress response and examined the consequence of light-responsive psbA regulation on the composition of D1 in thylakoid membranes. Heat shock and oxidative stress had some effect on levels of the three psbA transcripts but did not produce the responses generated by an increase in light intensity. Prolonged exposure to high light (24-h time course) was characterized by elevated levels of all psbA transcripts through maintenance of high levels of psbAII and psbAIII messages and a rebound of the psbAI transcript after its initial decline. Form II-encoding transcripts were enriched relative to those encoding form I at all high-light time points. Form II replaced form I in the thylakoid membrane at high light despite an abundance of psbAI transcript at later time points; this may be explained by the observed faster turnover of form I than form II in the membrane. We propose that form II is less susceptible to damage at high light and that this qualitative alteration, coupled with increased turnover of D1, protects the cells from photoinhibition." @default.
• W1503041385 created "2016-06-24" @default.
• W1503041385 creator A5027610160 @default.
• W1503041385 creator A5078162121 @default.
• W1503041385 date "1994-02-01" @default.
• W1503041385 modified "2023-09-27" @default.
• W1503041385 title "Adaptation to high light intensity in Synechococcus sp. strain PCC 7942: regulation of three psbA genes and two forms of the D1 protein" @default.
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• W1503041385 doi "https://doi.org/10.1128/jb.176.4.959-965.1994" @default.
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