Recently, the laboratory of Professor Deng Xingwang, School of Life Sciences, Peking University, revealed for the first time the biochemical mechanism by which the COP1 protein functions as a positive regulator during the UV-B photomorphogenesis of Arabidopsis. The COP1 gene was first discovered by Professor Deng Xingwang in Arabidopsis thaliana and was identified as an inhibitor of photomorphogenesis. The COP1 protein is conserved in animals and plants, and depends on different biological events and has functional diversity. In the traditional visible light-induced photomorphogenesis, COP1 has E3 ubiquitin ligase activity, causing the degradation of multiple photomorphogenesis promoting factors, thereby inhibiting this developmental process. In the newly discovered UV-B-induced photomorphogenesis, COP1 is a key positive regulator. Dr. Huang's past research found that COP1 gene expression is regulated by UV-B (Huang et al., Plant Cell, 2012). On this basis, she further found that the protein function of COP1 is also regulated by UV-B and forms different complexes according to different light signals. The new complex of COP1 induced by UV-B contains the UV-B photoreceptor UVR8, which reverses the function of COP1 and promotes the stability and activity of the typical light morphogenesis-promoting factor HY5, thus achieving COP1 in the UV -B Positive regulation in the formation of light patterns. This work not only explains the multiple functions of COP1 in plant light signal transduction, but also proves that the limited protein coding capacity of organisms meets the diverse functional requirements. The publication of this work has attracted widespread attention in the field of botany, and has been invited to write relevant comments by Plant Signaling & Behavior magazine. The above work has received strong support from NIH, the National Natural Science Foundation of China, the State Key Laboratory of Protein Engineering and Plant Genetic Engineering of Peking University, the China Postdoctoral Science Foundation, and the Peking University-Tsinghua Life Science Joint Center. The first author of this work is the postdoctoral flavan in the laboratory. Related research papers were published in the recently published "PNAS" magazine.
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Peking University made important progress in the field of UV-B optical signal transduction