Solution structure of the conserved 16 S-like ribosomal RNA UGAA tetraloop

Journal of Molecular Biology
Samuel E ButcherJ Feigon

Abstract

The solution structure of the highly conserved UGAA tetraloop found at the 3' end of eukaryotic 16 S-like ribosomal RNA has been solved by nuclear magnetic resonance spectroscopy in the form of the 12 nucleotide hairpin 5'-GGUG[UGAA]CACC. The UGAA tetraloop displays a novel fold. The backbone turn occurs between the G and the third A in the loop, with the U and G in a 5' stack and the As in a 3' stacking arrangement. The loop is closed by a U-A mismatch in which the O2, 2'OH, and O4' groups of the U are within hydrogen bonding distance of the amino group of the A. The tetraloop does not make a uridine-turn, even though its sequence is identical to a U-turn found within the anticodon loop of tRNA(Phe). The hydrogen bonding pattern in the tetraloop provides insight into the function of base modifications found in vivo within this portion of 16 S-like rRNA.

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