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Nucleic Acids Research, Vol 24, Issue 14 2666-2672, Copyright © 1996 by Oxford University Press

ARTICLES

Structure of a U.U pair within a conserved ribosomal RNA hairpin

YX Wang, S Huang and DE Draper
Department of Chemistry, Johns Hopkins University, Baltimore, MD 21218, USA.

A conserved hairpin corresponding to nt 1057-1081 of large subunit rRNA (Escherichia coli numbering) is part of a domain targeted by antibiotics and ribosomal protein L11. The stem of the hairpin contains a U.U juxtaposition, found as either U.U or U.C in virtually all rRNA sequences. This hairpin has been synthesized and most of the aromatic and sugar protons were assigned by two-dimensional proton NMR. Distances and sugar puckers deduced from the NMR data were combined with restrained molecular dynamics calculations to deduce structural features of the hairpin. The two U residues are stacked in the helix, form one NH3-O4 hydrogen bond and require an extended backbone conformation (trans alpha and gamma) at one of the U nucleotides. The hairpin loop, UAGAAGC closed by a U-A pair, is the same size as tRNA anticodon loops, but not as well ordered.
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