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BAK1 Directly Regulates Brassinosteroid Perception and BRI1 Activation

Journal of Integrative Plant Biology 2013年第12期55卷 1264-1270页

作者： Kai He Shengbao Xu Jia Li Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations School of Life SciencesLanzhou University

Plants utilize plasma membrane-localized receptor-like kinase. （RLKs） to sense extracellular signals to coordinate growth, development, and innate immune responses. BAK1 regulates multiple signaling pathways acting as a co-receptor of several distinct ligand-binding RLKs. It has been debated whether BAK1 serves as an essential regulatory component or only a signal amplifier without pathway specificity. This issue has been clarified recently. Genetic and structural analyses indicated that BAK1 and its homologs play indispensible roles in mediating brassinosteroid （BR） signaling pathway by directly perceiving the ligand BR and activating the receptor of BR, BRII. The mechanism revealed by these studies now serves as a paradigm for how a pair of RLKs can function together in ligand binding and subsequent initiation of signaling.

关键词： Arabidopsis BAK1 brassinosteroid BRI1 co-receptor extracellular domain leucine-rich repeat receptor receptor-like kinase.

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Cloning and Preliminary Characterization of Three receptor-like kinase.Genes in Soybean

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Journal of Integrative Plant Biology 2006年第11期48卷 1338-1347页

作者： Yuan-Yuan Ma Li-Wen Zhang Peng-Li Li Rui Gan Xiao-Ping Li Ren Zhang Yong Wang Ning-Ning Wang Department of Plant Biology Nankai University Tianjin 300071 China Department of Biological Sciences University of Wollongong Wollongong New South Wales 2522 Australia

Leaf senescence that occurs in the last stage of leaf development is a genetically programmed process. It is very significant to isolate the upstream components in the senescence signaling pathway and to elucidate the molecular mechanisms that control the initiation and progression of leaf senescence. In this study, full-length cDNAs of three receptor-like protein kinase.genes, designated rlpkl, rlpk2 and rlpk3, were cloned from artificially-induced senescent soybean （Glycine max L.） primary leaves （GenBank accession AY687390, AY687391, AF338813）. The deduced amino acid sequences indicated that they belonged to a receptor-like kinase.family. Each of rlpkl and rlpk2 encodes a leucine-rich repeat （LRR） receptor-like protein kinase. They both comprise a typical signal peptide, several LRR motifs, a single-pass transmembrane domain, and a cytoplasmic protein kinase.domain. No typical extracellular domain of RLPK3 was predicted. Organ-specific expression pattern analysis by reverse-transcription polymerase chain reaction （RT-PCR） revealed higher expression levels of the three genes in cotyledons, roots and flowers. Phylogenetic analysis indicated that RLPK1 and RLPK2 belonged to an independent branch, whereas RLPK3 shared common nodes with several known RLKs responding to ablotic and biotic stresses. The evident alternations of expression profiles of rlpkl and rlpk2 induced by the artificial senescence-inducing treatment implied involvements of these two RLKs in regulating soybean leaf senescence.

关键词： gene expression Glycine max： leaf senescence leucine-rich repeat phylogenesis analysis receptor-like kinase.

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