PMID- 24304604 OWN - NLM STAT- MEDLINE DCOM- 20141215 LR - 20211021 IS - 1559-2324 (Electronic) IS - 1559-2316 (Print) IS - 1559-2316 (Linking) VI - 8 IP - 11 DP - 2013 Nov TI - Organization of protein complexes under photomorphogenic UV-B in Arabidopsis. PG - e27206 LID - 10.4161/psb.27206 [doi] LID - e27206 AB - Low-fluence and long-wavelength UV-B (UV-B) light promotes photomorphogenic development in Arabidopsis. CONSTITUTIVE PHOTOMORPHOGENIC 1 (COP1) is a positive regulator in this pathway while it is a negative regulator of the traditional photomorphogenesis triggered by far-red and visible light. We have recently reported the mechanism by which the switch of COP1 function is accomplished in distinct light contexts. In response to photomorphogenic UV-B, the photoactivated UV RESISTANCE LOCUS 8 (UVR8) associates with the COP1- SUPRESSOR OF PHYA (SPA) core complexes, resulting in the physical and functional disassociation of COP1-SPA from the CULLIN4-DAMAGED DNA BINDING PROTEIN 1 (CUL4-DDB1) E3 scaffold. These UV-B dependent UVR8-COP1-SPA complexes promote the stability and activity of ELONGATED HYPOCOTYL 5 (HY5), and eventually cause COP1 to switch from repressing to promoting photomorphogenesis. In addition, it is possible that CUL4-DDB1 might simultaneously recruit alternative DDB1 BINDING WD40 (DWD) proteins to repress this UV-B-specific signaling. Further investigation is required, however, to verify this hypothesis. Overall, the coordinated organization of various protein complexes facilitates an efficient and balanced UV-B signaling. FAU - Huang, Xi AU - Huang X AD - Peking-Yale Joint Center for Plant Molecular Genetics and Agro-Biotechnology; National Laboratory of Protein Engineering and Plant Genetic Engineering; College of Life Sciences; Peking University; Beijing, PR China. FAU - Deng, Xing Wang AU - Deng XW AD - Peking-Yale Joint Center for Plant Molecular Genetics and Agro-Biotechnology; National Laboratory of Protein Engineering and Plant Genetic Engineering; College of Life Sciences; Peking University; Beijing, PR China. LA - eng PT - Journal Article DEP - 20131204 PL - United States TA - Plant Signal Behav JT - Plant signaling & behavior JID - 101291431 RN - 0 (Arabidopsis Proteins) RN - 0 (Multiprotein Complexes) SB - IM MH - Arabidopsis/*growth & development/metabolism/*radiation effects MH - Arabidopsis Proteins/*metabolism MH - Models, Biological MH - Morphogenesis/*radiation effects MH - Multiprotein Complexes/*metabolism MH - Signal Transduction/radiation effects MH - *Ultraviolet Rays PMC - PMC4091229 OTO - NOTNLM OT - UV-B OT - light signaling OT - protein complex EDAT- 2013/12/07 06:00 MHDA- 2014/12/17 06:00 PMCR- 2014/06/04 CRDT- 2013/12/06 06:00 PHST- 2013/12/06 06:00 [entrez] PHST- 2013/12/07 06:00 [pubmed] PHST- 2014/12/17 06:00 [medline] PHST- 2014/06/04 00:00 [pmc-release] AID - 27206 [pii] AID - 2013PSB0399 [pii] AID - 10.4161/psb.27206 [doi] PST - ppublish SO - Plant Signal Behav. 2013 Nov;8(11):e27206. doi: 10.4161/psb.27206. Epub 2013 Dec 4.