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. 2021 Oct 18;188(1):332–346. doi: 10.1093/plphys/kiab486

Figure 1.

Figure 1

Schematic summary of UVR8-mediated signaling pathways related to UV-B responses and photomorphogenesis. A, Without UV-B irradiation, UVR8 forms a homodimer in cytoplasm. B, UV-B radiation triggers the dissociation of UVR8 homodimer, and the UVR8 monomers are capable to interact with COP1, which can, in turn, regulate the expression of HY5. UVR8 regulates numerous potential transcriptional factors (WRKY36, BES1, BIM1, MYB73, MYB77, PIF4, and PIF5) to mediate the UV-B responses and photomorphogenesis. The negative feedback regulators RUP1 and RUP2 facilitate redimerization of UVR8 to complete the UV-B photocycle.