Comparative Study of Nucletic Acid Binding of the Purified RBF Protein and Its Inhibition of PKR phosphorylation

RBF정제단백질의 핵산결합도 및 PKR효소의 인산화억제효과의 비교에 관한 연구

  • 박희성 (대구효성카톨릭대학교 식물육종학과) ;
  • 김인수 (경북대학교 유전공학과)
  • Published : 1998.04.01

Abstract

Column-purified double-stranded RNA binding factor (RBF) protein was tested for its binding affinity for the different forms of nucleic acids structure such as single-stranded(ss) and double-stranded(ds)RNA and ss- and dsDNA. The RBF protein was incubated with each of these nucleic acid structures in separate reactions and its comparative binding affnity was visualized by SDS-polyacrylamide gel electrophoresis. The RBF protein bound to the dsRNA molecule to form a tight RNA:protein complex in agreement with previous studies, but not to the other nucleic acid molecules confirming its distinctive affinity for the dsRNA structure. In phosphorylation assay in vito, the purified RBF protein significantly inhibited the autophosphorylation of the PKR derived from not only human but mouse source in the presence of poly(I):poly(C). It is suggesting that PKR vs. RBF is similarly under a competitive interaction among different eukaryotic organisms during protein synthesis.

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