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- W2895576719 abstract "Phototrophic microorganisms adjust photosystem synthesis in response to changes in light intensity and wavelength. A variety of different photoreceptors regulate this process. Purple photosynthetic bacteria synthesize a novel photoreceptor AerR that uses cobalamin (B12) as a blue-light absorbing chromophore to control photosystem synthesis. AerR directly interacts with the redox responding transcription factor CrtJ, affecting CrtJ’s interaction with photosystem promoters. In this study, we show that AerR is translated as two isoforms that differ by 41 amino acids at the amino terminus. The ratio of these isoforms was affected by light and cell growth phase with the long variant predominating during photosynthetic exponential growth and the short variant predominating in dark conditions and/or stationary phase. Pigmentation and transcriptomic analyses show that the short AerR variant represses, while long variant activates, photosynthesis genes. The long form of AerR also activates many genes involved in cellular metabolism and motility." @default.
- W2895576719 created "2018-10-12" @default.
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- W2895576719 date "2018-10-03" @default.
- W2895576719 modified "2023-09-24" @default.
- W2895576719 title "Differing isoforms of the cobalamin binding photoreceptor AerR oppositely regulate photosystem expression" @default.
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- W2895576719 doi "https://doi.org/10.7554/elife.39028" @default.
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