SPEAKER: Ruohe Yin Tenure-track Associate Professor, Principal Investigator Department of Plant Science, School of Agriculture and Biology   【Selected Publications】 Lin, L., Dong, H., Yang, G., and Yin, R*. (2020). The C-terminal 17 amino acids of the photoreceptor UVR8 is involved in the fine-tuning of UV-B signaling. J Integr Plant Biol 62, 1327-1340. (٭Correspondence author） Lin L, Liu XR, Yin R* (2018）PIF3 Integrates Light and Low Temperature Signaling. Trends Plant Sci., 23:93-95. (٭Correspondence author） Yin, R., Skvortsova, M.Y., Loubéry, S., and Ulm, R. (2016) COP1 is required for UV-B–induced nuclear accumulation of the UVR8 photoreceptor. Proc. Natl. Acad. Sci. USA 113: E4415-E4422. Yin, R., Arongaus, A.B., Binkert, M., and Ulm, R. (2015) Two distinct domains of the UVR8 photoreceptor interact with COP1 to initiate UV-B signaling in Arabidopsis. Plant Cell 27: 202-213.

TIME ：12:45-13:30 Mar 17 2021 (Wednesday)

VENUE：Room 104, Building B, School of Agriculture and Biology

ORGANIZER：Office of Discipline and Science & Technology, SAB; Young Teachers Association, SAB

TITTLE: Mechanisms for photoreceptor UVR8-mediated signaling in plants

ABSTRACT: 

The ultraviolent-B (UV-B) radiation is an integral component of solar radiation on earth surface. UVR8 was characterized as a UV-B photoreceptor that can regulate a series of physiological process in plants, ranging from seedling de-etiolation to flowering. In addition, UVR8 can also regulate phototropism and tolerance to biotic and abiotic stresses. UVR8 proteins are distributed in both cytosol and nucleus. Through manipulation the subcellular localization of UVR8, it was shown that nuclear localization is a prerequisite for the key functions of UVR8. UV-B promotes UVR8 protein accumulation in nucleus, where it interacts with its protein partners including several known transcription factors to regulate gene transcription and photomorphogenesis. Thus, examination the mechanisms for the UV-B-induced UVR8 accumulation in nucleus is critical for the understanding of early UV-B signaling events. In response to UV-B, UVR8 homodimers dissociate into monomers. Monomeric UVR8 interacts with COP1. Moreover, UVR8-mediated UV-B signaling requires COP1. Previously, we reported that COP1 is required for UV-B-induced UVR8 accumulation in nucleus [3]. However, the working mechanisms for COP1 in this process is not known. We performed a series of experiments including FRAP to test the possible working mechanisms of COP1, including mediating UVR8 nuclear import and preventing UVR8 nuclear export. The possible mechanisms of UV-B-induced UVR8 accumulation in nucleus and the relevant function of COP1 will be discussed.