PMID- 25609555 OWN - NLM STAT- MEDLINE DCOM- 20160114 LR - 20191210 IS - 1532-2548 (Electronic) IS - 0032-0889 (Print) IS - 0032-0889 (Linking) VI - 167 IP - 3 DP - 2015 Mar TI - The Arabidopsis transcription factor BRASSINOSTEROID INSENSITIVE1-ETHYL METHANESULFONATE-SUPPRESSOR1 is a direct substrate of MITOGEN-ACTIVATED PROTEIN KINASE6 and regulates immunity. PG - 1076-86 LID - 10.1104/pp.114.250985 [doi] AB - Pathogen-associated molecular patterns (PAMPs) are recognized by plant pattern recognition receptors to activate PAMP-triggered immunity (PTI). Mitogen-activated protein kinases (MAPKs), as well as other cytoplasmic kinases, integrate upstream immune signals and, in turn, dissect PTI signaling via different substrates to regulate defense responses. However, only a few direct substrates of these signaling kinases have been identified. Here, we show that PAMP perception enhances phosphorylation of BRASSINOSTEROID INSENSITIVE1-ETHYL METHANESULFONATE-SUPPRESSOR1 (BES1), a transcription factor involved in brassinosteroid (BR) signaling pathway, through pathogen-induced MAPKs in Arabidopsis (Arabidopsis thaliana). BES1 interacts with MITOGEN-ACTIVATED PROTEIN KINASE6 (MPK6) and is phosphorylated by MPK6. bes1 loss-of-function mutants display compromised resistance to bacterial pathogen Pseudomonas syringae pv tomato DC3000. BES1 S286A/S137A double mutation (BES1(SSAA)) impairs PAMP-induced phosphorylation and fails to restore bacterial resistance in bes1 mutant, indicating a positive role of BES1 phosphorylation in plant immunity. BES1 is phosphorylated by glycogen synthase kinase3 (GSK3)-like kinase BR-insensitive2 (BIN2), a negative regulator of BR signaling. BR perception inhibits BIN2 activity, allowing dephosphorylation of BES1 to regulate plant development. However, BES1(SSAA) does not affect BR-mediated plant growth, suggesting differential residue requirements for the modulation of BES1 phosphorylation in PTI and BR signaling. Our study identifies BES1 as a unique direct substrate of MPK6 in PTI signaling. This finding reveals MAPK-mediated BES1 phosphorylation as another BES1 modulation mechanism in plant cell signaling, in addition to GSK3-like kinase-mediated BES1 phosphorylation and F box protein-mediated BES1 degradation. CI - (c) 2015 American Society of Plant Biologists. All Rights Reserved. FAU - Kang, Sining AU - Kang S AD - State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China (S.K., F.Y., J.Z.);University of Chinese Academy of Sciences, Beijing 100049, China (F.Y.); National Institute of Biological Sciences, Zhongguancun Life Science Park, Beijing 102206, China (L.L., S.C.); andState Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China (H.C.). FAU - Yang, Fan AU - Yang F AD - State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China (S.K., F.Y., J.Z.);University of Chinese Academy of Sciences, Beijing 100049, China (F.Y.); National Institute of Biological Sciences, Zhongguancun Life Science Park, Beijing 102206, China (L.L., S.C.); andState Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China (H.C.). FAU - Li, Lin AU - Li L AD - State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China (S.K., F.Y., J.Z.);University of Chinese Academy of Sciences, Beijing 100049, China (F.Y.); National Institute of Biological Sciences, Zhongguancun Life Science Park, Beijing 102206, China (L.L., S.C.); andState Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China (H.C.). FAU - Chen, Huamin AU - Chen H AD - State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China (S.K., F.Y., J.Z.);University of Chinese Academy of Sciences, Beijing 100049, China (F.Y.); National Institute of Biological Sciences, Zhongguancun Life Science Park, Beijing 102206, China (L.L., S.C.); andState Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China (H.C.). FAU - Chen, She AU - Chen S AD - State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China (S.K., F.Y., J.Z.);University of Chinese Academy of Sciences, Beijing 100049, China (F.Y.); National Institute of Biological Sciences, Zhongguancun Life Science Park, Beijing 102206, China (L.L., S.C.); andState Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China (H.C.). FAU - Zhang, Jie AU - Zhang J AD - State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China (S.K., F.Y., J.Z.);University of Chinese Academy of Sciences, Beijing 100049, China (F.Y.); National Institute of Biological Sciences, Zhongguancun Life Science Park, Beijing 102206, China (L.L., S.C.); andState Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China (H.C.) zhangjie@im.ac.cn. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20150121 PL - United States TA - Plant Physiol JT - Plant physiology JID - 0401224 RN - 0 (Arabidopsis Proteins) RN - 0 (BES1 protein, Arabidopsis) RN - 0 (Brassinosteroids) RN - 0 (DNA-Binding Proteins) RN - 0 (Nuclear Proteins) RN - 12777-81-0 (Flagellin) RN - 17885-08-4 (Phosphoserine) RN - EC 2.7.11.24 (MPK6 protein, Arabidopsis) RN - EC 2.7.11.24 (Mitogen-Activated Protein Kinases) SB - IM MH - Arabidopsis/*enzymology/*immunology/microbiology MH - Arabidopsis Proteins/*metabolism MH - Brassinosteroids/pharmacology MH - DNA-Binding Proteins MH - Disease Resistance/immunology MH - Enzyme Activation/drug effects MH - Flagellin/metabolism MH - Hypocotyl/drug effects/growth & development MH - Mitogen-Activated Protein Kinases/*metabolism MH - Nuclear Proteins/*metabolism MH - Phosphorylation/drug effects MH - Phosphoserine/metabolism MH - Plant Diseases/immunology/microbiology MH - *Plant Immunity/drug effects MH - Plant Roots/drug effects/growth & development MH - Protein Binding/drug effects MH - Pseudomonas syringae/drug effects MH - Substrate Specificity/drug effects PMC - PMC4348755 EDAT- 2015/01/23 06:00 MHDA- 2016/01/15 06:00 PMCR- 2016/03/01 CRDT- 2015/01/23 06:00 PHST- 2015/01/23 06:00 [entrez] PHST- 2015/01/23 06:00 [pubmed] PHST- 2016/01/15 06:00 [medline] PHST- 2016/03/01 00:00 [pmc-release] AID - pp.114.250985 [pii] AID - 250985 [pii] AID - 10.1104/pp.114.250985 [doi] PST - ppublish SO - Plant Physiol. 2015 Mar;167(3):1076-86. doi: 10.1104/pp.114.250985. Epub 2015 Jan 21.