Nurturing Life Sciences
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#Unit 6. System Physiology – Plant
COP1 is found in the nucleus in the dark and in the cytoplasm in the light.
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During the night, COP1 enters the nucleus with the help of the COP9 signalosome complex (CSN).
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During the day, COP1 exits the nucleus, allowing the transcriptional activators to accumulate.
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Bacterial phytochrome is an example of a two-component signaling system in which phytochrome functions as a sensor protein that phosphorylates a response regulator.
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Plant phytochrome is an autophosphorylating serine/threonine kinase that may phosphorylate other proteins (X).
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The gene that encodes the MYB-related protein is therefore probably a primary response gene, and the LHCB gene itself is probably a secondary response gene.