On the basis of sequence alignments, the pseudouridine synthases were grouped into four families that share no statistically significant global sequence similarity, though some common sequence motifs were discovered [Koonin, E. V. (1996) Nucleic Acids. Res. 24, 2411-2415; Gustafsson, C., Reid, R.,
Shq1 is an essential protein involved in the early steps of biogenesis and assembly of H/ACA ribonucleoprotein particles (RNPs). Shq1 binds to dyskerin (Cbf5 in yeast) at an early step of H/ACA RNP assembly and is subsequently displaced by the H/ACA RNA. Shq1 contains an N-terminal CS and a
The pseudouridine synthase and archaeosine transglycosylase (PUA) domain is a compact and highly conserved RNA-binding motif that is widespread among diverse types of proteins from the three kingdoms of life. Its three-dimensional architecture is well established, and the structures of several
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