title: Interaction of PRK1 receptor-like kinase with a putative elF2B beta-subunit in tobacco.
abstract: PRK1, a receptor-like kinase that is expressed in pollen, pollen tubes, and ovaries, has been shown to play important roles in pollen development and embryo sac development in Petunia inflata. We have used the kinase domain of PRK1 as a bait in the yeast two-hybrid system to identify PRK1-interacting proteins. The screening resulted in isolation of a cDNA encoding a protein highly homologous to the human and yeast beta-subunit of translation initiation factor 2B (eIF2B-beta), which was designated NeIF2Bbeta. eIF2B is a guanine nucleotide exchange protein that functions in the regulation of translation in eukaryotic cells. Deletion mutants of NeIF2Bbeta were analyzed for their interaction with PRK1, and the results suggested that the N-terminal half of NeIF2Bbeta, especially the region between residue 103 and 235, is important for the interaction. This protein association was confirmed by in vitro binding assay of the recombinant NeIF2Bbeta and PRK1 proteins. Despite high sequence homology between NeIF2Bbeta and its yeast counterpart, the NeIF2Bbeta cDNA could not rescue the phenotype of the yeast mutant strain lacking the GCD7 gene encoding eIF2B-beta, when transferred into the mutant strain.
authors.affiliation: Plant Cell Biotechnology Laboratory, Korea Research Institute of Bioscience and Biotechnology, Taejon.
authors.forename: S W
authors.initials: SW
authors.lastname: Park
authors.forename: S H
authors.initials: SH
authors.lastname: Yu
authors.forename: M I
authors.initials: MI
authors.lastname: Kim
authors.forename: S C
authors.initials: SC
authors.lastname: Oh
authors.forename: T H
authors.initials: TH
authors.lastname: Kao
authors.forename: H S
authors.initials: HS
authors.lastname: Pai
mesh_terms: D000595:Amino Acid Sequence; D001665:Binding Sites; D020717:Eukaryotic Initiation Factor-2B / Q000737:chemistry* / Q000378:metabolism; D015723:Gene Library; D006801:Humans; D008969:Molecular Sequence Data; D010448:Peptide Initiation Factors / Q000737:chemistry / Q000378:metabolism; D010770:Phosphotransferases / Q000737:chemistry / Q000378:metabolism; D010940:Plant Proteins / Q000737:chemistry / Q000378:metabolism; D010947:Plants, Toxic; D011485:Protein Binding; D017346:Protein Serine-Threonine Kinases; D017434:Protein Structure, Tertiary; D021122:Protein Subunits; D020794:Receptor Protein-Tyrosine Kinases / Q000737:chemistry / Q000378:metabolism*; D016415:Sequence Alignment; D014026:Nicotiana / Q000737:chemistry* / Q000235:genetics; D020798:Two-Hybrid System Techniques; D015003:Yeasts / Q000235:genetics
chemical_list: D020717:Eukaryotic Initiation Factor-2B; D010448:Peptide Initiation Factors; D010940:Plant Proteins; D021122:Protein Subunits; D010770:Phosphotransferases; C088479:PRK1 protein, Petunia inflata; D020794:Receptor Protein-Tyrosine Kinases; D017346:Protein Serine-Threonine Kinases