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Phosphorylated adapter RNA export protein, RNA-binding domain The phosphorylated adaptor for RNA export (PHAX) protein transports U3 snoRNA from the nucleus after transcription. This entry represents the highly conserved U3 snoRNA-binding domain of PHAX, which is characterized by having two pairs of adjacent glycines with the sequence motif GGx12GG. This domain adopts a novel helical fold and binds non-specific single-stranded RNA and comprises five alpha-helices linked by short loops containing 1 to 4 residues, apart from helices alpha3 and 4 that are linked by 13 residues. The fold is unique to this kind of RNA binding domains which show no structural homology with other RNA-binding domains.
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