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RNA Structure01:19

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The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
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Four RNA families with functional transient structures.

Jing Yun A Zhu1, Irmtraud M Meyer

  • 1a Centre for High-Throughput Biology and Department of Computer Science and Department of Medical Genetics; University of British Columbia ; Vancouver , BC , Canada.

RNA Biology
|March 10, 2015
PubMed
Summary
This summary is machine-generated.

This study identifies four new RNA families with transient structures, revealing their conserved roles in gene regulation. These transient RNA structures, previously overlooked, are now documented and integrated into RNA databases.

Keywords:
HDV ribozymeLevivirusSAM riboswitchco-transcriptional RNA foldinggene expressionmutually exclusive RNA structuresregulatory RNA structurestransient RNA structurestrp operon leader

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Area of Science:

  • Molecular Biology
  • RNA Biology
  • Bioinformatics

Background:

  • RNA molecules perform diverse cellular functions, often modulated by their structure.
  • RNA transcripts can adopt multiple functional structures throughout their lifecycle, a phenomenon often overlooked.
  • Transient RNA structures exist only under specific conditions, playing distinct roles.

Purpose of the Study:

  • To identify and characterize novel RNA families with transient structures.
  • To demonstrate that these transient RNA structures are evolutionarily conserved and functionally significant.
  • To update existing RNA databases (Rfam) or introduce new families to accommodate these transient structures.

Main Methods:

  • Compilation of multiple-sequence alignments for four RNA families with transient structures.
  • Utilized automated covariance model searches and manual curation.
  • Based alignments on experimentally verified transient and dominant RNA secondary structures.

Main Results:

  • Introduced four novel RNA families, each possessing distinct transient RNA structures.
  • Showcased that these transient structures are well-defined and evolutionarily conserved.
  • Provided updated or new Rfam alignments, incorporating transient and dominant RNA structures for Trp operon leader, HDV ribozyme, Levivirus maturation protein 5' UTR, and SAM riboswitch.

Conclusions:

  • Transient RNA structures represent an important layer of RNA regulation.
  • The characterized RNA families and their transient structures expand our understanding of RNA function and evolution.
  • The integration of these findings into Rfam enhances the annotation of RNA families and their regulatory mechanisms.