Nurturing Life Sciences
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#Unit 6. System Physiology – Plant
Some genes encode proteins are called CONSTITUTIVE PHOTO-MORPHOGENESIS1 (COP1), DE-ETIOLATED (DET), and FUSCA (FUS).
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These genes encode proteins of the COP1–SUPPRESSOR OF PHYA (COP1–SPA) complex, the COP9 signalosome (CSN) complex.
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COP1, another negative regulator of photomorphogenesis, is a component of the E3 ubiquitin ligase complex that targets photomorphogenesis-promoting proteins for degradation such as phyA, phyB
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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.