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Related Concept Videos

Ribozymes02:47

Ribozymes

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The term ribozyme is used for RNA that can act as an enzyme. Ribozymes are mainly found in selected viruses, bacteria, plant organelles, and lower eukaryotes. Ribozymes were first discovered in 1982 when Tom Cech’s laboratory observed Group I introns acting as enzymes. This was shortly followed by the discovery of another ribozyme, Ribonulcease P, by Sid Altman’s laboratory. Both Cech and Altman received the Nobel Prize in chemistry in 1989 for their work on ribozymes.
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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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The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. 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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Related Experiment Video

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Analysis of Group IV Viral SSHHPS Using In Vitro and In Silico Methods
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New tools provide a second look at HDV ribozyme structure, dynamics and cleavage.

Gary J Kapral1, Swati Jain2, Jonas Noeske3

  • 1Department of Biochemistry, Duke University, Durham, NC 27710, USA.

Nucleic Acids Research
|October 19, 2014
PubMed
Summary

New computational methods refined Hepatitis Delta Virus (HDV) ribozyme structures, improving models for studying RNA dynamics and catalytic mechanisms. These enhanced models offer a better foundation for future research into this essential viral RNA enzyme.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Virology

Background:

  • The Hepatitis Delta Virus (HDV) ribozyme is a crucial self-cleaving RNA enzyme.
  • It plays a vital role in processing viral RNA during replication.
  • Previous structural studies have provided insights into various forms of the ribozyme.

Purpose of the Study:

  • To utilize advanced computational tools to rebuild and refine existing HDV ribozyme structures.
  • To improve the accuracy and reliability of structural models for studying RNA dynamics.
  • To provide a more robust structural basis for understanding the HDV ribozyme's catalytic mechanism.

Main Methods:

  • Application of ERRASER and PHENIX software for RNA structure rebuilding and refinement.
  • Re-refinement of previously solved cleaved and C75U-inhibited HDV ribozyme structures.
  • Comparison of rebuilt structures with a high-resolution trans-acting deoxy-inhibited structure.

Main Results:

  • Corrected local RNA conformations and identified alternative residue conformations.
  • Achieved improved R values and model validation statistics for the refined structures.
  • The refined structures (PDBs: 4PR6, 4PRF) offer enhanced accuracy.

Conclusions:

  • The rebuilt HDV ribozyme structures provide a more reliable foundation for future research.
  • While consistent with known mechanisms, they do not offer new direct structural evidence for cleavage.
  • Demonstrates the power of new computational techniques for improving RNA structural models.