Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 103, Issue 51, Pages 19490-19495Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0607493103
Keywords
isoprenoid; riboswitch; ribozyme; superoperon
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Funding
- NIGMS NIH HHS [R01 GM068819, GM068819] Funding Source: Medline
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We have discovered a large and highly conserved RNA motif that typically resides in a noncoding section of a multigene messenger RNA in extremophilic Gram-positive eubacteria. RNAs of this class adopt an ornate secondary structure, are large compared with most other noncoding RNAs, and have been identified only in certain extremophilic bacteria. These ornate, large, extremophilic (OLE) RNAs have a length of approximate to 610 nucleoticles, and the 35 representatives examined exhibit extraordinary conservation of nucleotide sequence and base pairing. Structural probing of the OLE RNA from Bacillus halodurans corroborates a complex secondary structure model predicted from comparative sequence analysis. The patterns of structural conservation, and its unique phylogenetic distribution, suggest that OLE RNA carries out a complex and critical function only in certain extremophilic bacteria.
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