The selenocysteine insertion sequence binding protein SBP is different from the Y-box protein dbpB.
In eukaryotes, translation of internal UGA selenocysteine codons requires the SECIS stem-loop structure in the 3'UTR of selenoprotein mRNAs. In an earlier work, we identified SBP as a selenocysteine insertion sequence (SECIS)-binding protein. Here, the yeast three-hybrid screen was employed to capture the cDNA of SBP. One candidate, satisfying the genetic screens, was identified as the already known dbpB protein. Although it was also found by another group, but with a different strategy, to carry SECIS-binding activity, further experiments enabled us to show that dbpB was unable to bind the SECIS element in vitro. Altogether, our findings led us to conclude that, under our conditions, dbpB and SBP are two distinct proteins.
Fagegaltier
D
D
UPR 9002 du CNRS, Structure des Macromolécules Biologiques et Mécanismes de Reconnaissance, Institut de Biologie Moléculaire et Cellulaire, 15, rue René-Descartes, 67084, Strasbourg, France.
Hubert
N
N
Carbon
P
P
Krol
A
A
D000818:Animals; D001483:Base Sequence; D022762:CCAAT-Enhancer-Binding Proteins; D019556:COS Cells; D003001:Cloning, Molecular; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D051839:NFI Transcription Factors; D009687:Nuclear Proteins; D009690:Nucleic Acid Conformation; D012313:RNA / Q000378:metabolism; D016601:RNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D051381:Rats; D014157:Transcription Factors; D051840:Y-Box-Binding Protein 1
D022762:CCAAT-Enhancer-Binding Proteins; D004268:DNA-Binding Proteins; D051839:NFI Transcription Factors; D009687:Nuclear Proteins; D016601:RNA-Binding Proteins; D014157:Transcription Factors; D051840:Y-Box-Binding Protein 1; C070856:YBX1 protein, human; C119984:selenocysteine insertion sequence binding protein, mammalian; D012313:RNA