title: Molecular characterization of two highly homologous receptor-like kinase genes, RLK902 and RKL1, in Arabidopsis thaliana.
abstract: Receptor-like kinases (RLKs) constitute a large family of signal perception molecules. We characterized two highly homologous RLK genes, RLK902 and RKL1, in Arabidopsis. RLK902 and RKL1 showed a 75% amino acid sequence identity over their entire regions. In the RLK902 pro::GUS transgenic lines, GUS activity was strong in the root tips, lateral root primordia, stipules, and floral organ abscission zones, while the RKL1 promoter activity was dominant in the stomata cells, hydathodes and trichomes of young rosette leaves, and floral organ abscission zones. Neither the rlk902 mutant line, rkl1 mutant line nor rlk902/rkl1 double-knockout mutant line showed any significant phenotypes under normal growth conditions. These results suggest that RLK902 and RKL1 might mediate the signal transduction pathway in which at least one other complementary signaling pathway to these two RLKs might exist.
authors.affiliation: Department of Applied Biological Chemistry, The University of Tokyo, Yayoi, Bunkyo-ku, Japan.
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Tarutani
authors.forename: Takashi
authors.initials: T
authors.lastname: Morimoto
authors.forename: Akiko
authors.initials: A
authors.lastname: Sasaki
authors.forename: Michiko
authors.initials: M
authors.lastname: Yasuda
authors.forename: Hideo
authors.initials: H
authors.lastname: Nakashita
authors.forename: Shigeo
authors.initials: S
authors.lastname: Yoshida
authors.forename: Isomaro
authors.initials: I
authors.lastname: Yamaguchi
authors.forename: Yoshihito
authors.initials: Y
authors.lastname: Suzuki
mesh_terms: D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000235:genetics*; D029681:Arabidopsis Proteins / Q000032:analysis / Q000235:genetics* / Q000502:physiology; D017343:Genes, Plant; D006651:Histocytochemistry; D008969:Molecular Sequence Data; D009154:Mutation; D010940:Plant Proteins / Q000502:physiology*; D018514:Plant Structures / Q000201:enzymology; D030821:Plants, Genetically Modified; D011494:Protein Kinases / Q000032:analysis / Q000235:genetics* / Q000502:physiology; D017385:Sequence Homology; D015398:Signal Transduction
chemical_list: D029681:Arabidopsis Proteins; D010940:Plant Proteins; D011494:Protein Kinases; C499427:RKL1 protein, Arabidopsis; C499426:RLK902 protein, Arabidopsis