Flooding Stress-Induced Glycine-Rich RNA-Binding Protein from Nicotiana tabacum

  • Lee, Mi-Ok (School of Biological Sciences and Institute of Molecular Biology and Genetics, Seoul National University) ;
  • Kim, Keun Pill (School of Biological Sciences and Institute of Molecular Biology and Genetics, Seoul National University) ;
  • Kim, Byung-gee (School of Chemical and Biological Engineering, Seoul National University) ;
  • Hahn, Ji-Sook (School of Chemical and Biological Engineering, Seoul National University) ;
  • Hong, Choo Bong (School of Biological Sciences and Institute of Molecular Biology and Genetics, Seoul National University)
  • 투고 : 2008.07.11
  • 심사 : 2008.10.17
  • 발행 : 2009.01.31


A cDNA clone for a transcript preferentially expressed during an early phase of flooding was isolated from Nicotiana tabacum. Nucleotide sequencing of the cDNA clone identified an open reading frame that has high homology to the previously reported glycine-rich RNA-binding proteins. The open reading frame consists of 157 amino acids with an N-terminal RNA-recognition motif and a C-terminal glycine-rich domain, and thus the cDNA clone was designated as Nicotiana tabaccum glycine-rich RNA-binding protein-1 (NtGRP1). Expression of NtGRP1 was upregulated under flooding stress and also increased, but at much lower levels, under conditions of cold, drought, heat, high salt content, and abscisic acid treatment. RNA homopolymer-binding assay showed that NtGRP1 binds to all the RNA homopolymers tested with a higher affinity to poly r(G) and poly r(A) than to poly r(U) and poly r(C). Nucleic acid-binding assays showed that NtGRP1 binds to ssDNA, dsDNA, and mRNA. NtGRP1 suppressed expression of the fire luciferase gene in vitro, and the suppression of luciferase gene expression could be rescued by addition of oligonucleotides. Collectively, the data suggest NtGRP1 as a negative modulator of gene expression by binding to DNA or RNA in bulk that could be advantageous for plants in a stress condition like flooding.


연구 과제 주관 기관 : Korean Research Foundation, Ministry of Education and Human Resources Development


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