Nucleic Acids Research, Vol 27, Issue 8 1859-1865, Copyright © 1999 by Oxford University Press
Y Ikawa, D Naito, N Aono, H Shiraishi and T Inoue
Terminal tetraloops consisting of GNRA sequences are often found in
biologically active large RNAs. The loops appear to contribute towards the
organization of higher order RNA structures by forming specific tertiary
interactions with their receptors. Group IC3 introns which possess a GAAA
loop in the L2 region often have a phylogenetically conserved motif in
their P8 domains. In this report, we show that this conserved motif stands
as a new class of receptor that distinguishes the sequences of GNRA loops
less stringently than previously known receptors. The motif can
functionally substitute an 11 nt motif receptor in the Tetrahymena
ribozyme. Its structural and functional similarity to one class of
synthetic receptors obtained from in vitro selection is observed.
ARTICLES
A conserved motif in group IC3 introns is a new class of GNRA receptor
Department of Chemistry, Faculty of Science, Kyoto University, Kyoto 606-8502, Japan.
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