title: Cloning and characterization of a gene encoding Rac/Rop-like monomeric guanosine 5'-triphosphate-binding protein from Scoparia dulcis.
abstract: A cDNA clone, designated Sd-racrop (969 bp), was isolated from seedlings of Scoparia dulcis. This gene contains an open reading frame encoding the protein of 197 amino acid residues with high homology to Rac/Rop small guanosine 5'-triphosphate-binding proteins from various plant sources. In Southern hybridization analysis, the restriction digests prepared from genomic DNA of S. dulcis showed a main signal together with a few weakly hybridized bands. The transcriptional level of Sd-racrop showed a transient decrease by exposure of the leaf tissues of S. dulcis to the ethylene-generating reagent 2-chloroethylphosphonic acid. However, an appreciable increase in gene expression was reproducibly observed upon treatment of the plant with methyl jasmonate. These results suggest that the Sd-racrop product plays roles in ethylene- and methyl jasmonate-induced responses of S. dulcis accompanying the change in the transcriptional level, however, the cellular events mediated by this protein toward these external stimuli would be regulated by various mechanisms.
authors.affiliation: Laboratory of Plant Resource Sciences, Graduate School of Medicine and Pharmaceutical Science for Research, University of Toyama, Toyama, Japan.
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Mitamura
authors.forename: Masato
authors.initials: M
authors.lastname: Shite
authors.forename: Yoshimi
authors.initials: Y
authors.lastname: Yamamura
authors.forename: Fumiya
authors.initials: F
authors.lastname: Kurosaki
mesh_terms: D000595:Amino Acid Sequence; D015139:Blotting, Southern; D003001:Cloning, Molecular; D015870:Gene Expression; D017343:Genes, Plant; D008969:Molecular Sequence Data; D010802:Phylogeny; D010940:Plant Proteins / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D036721:Scoparia / Q000187:drug effects / Q000235:genetics* / Q000378:metabolism; D016415:Sequence Alignment; D020744:rac GTP-Binding Proteins / Q000235:genetics*
chemical_list: D010940:Plant Proteins; D020744:rac GTP-Binding Proteins