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Related Concept Videos

Transfer RNA Synthesis02:36

Transfer RNA Synthesis

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One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
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RNA Structure01:19

RNA Structure

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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.
Different Types of RNA Have the Same Basic Structure
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Pre-mRNA Processing: Modification of pre-mRNA Ends01:35

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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
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pre-mRNA Processing02:01

pre-mRNA Processing

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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl...
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Ribosomal RNA Synthesis02:53

Ribosomal RNA Synthesis

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Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
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Eukaryotic RNA Polymerases00:58

Eukaryotic RNA Polymerases

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RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
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Analysis of RNA Processing Reactions Using Cell Free Systems: 3' End Cleavage of Pre-mRNA Substrates in vitro
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Multiple structural flavors of RNase P in precursor tRNA processing.

Sagar Sridhara1

  • 1Department of Medical Biochemistry and Cell Biology, University of Gothenburg, Gothenburg, Sweden.

Wiley Interdisciplinary Reviews. RNA
|March 13, 2024
PubMed
Summary

Ribonuclease P (RNase P) is essential for tRNA maturation across life, exhibiting diverse structures from RNA-based to RNA-free forms. Its varied roles offer potential in biotechnology and clinical applications.

Keywords:
HARPPRORPRNase Pstructural biologytRNA processing

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Area of Science:

  • Molecular Biology
  • RNA Processing
  • Biochemistry

Background:

  • Precursor transfer RNAs (pre-tRNAs) need extensive processing for cellular viability.
  • Ribonuclease P (RNase P) is a crucial endonuclease for 5' pre-tRNA processing across all domains of life.
  • RNase P exhibits variations in subunit composition and catalytic mechanisms, typically using a two-metal-ion catalysis.

Purpose of the Study:

  • To review the structural diversity of RNA-based and RNA-free RNase P holoenzymes.
  • To explore RNA-protein and protein-protein interactions in pre-tRNA processing.
  • To discuss the alternative roles and applications of RNase P in clinical and biotechnological fields.

Main Methods:

  • Literature review of RNase P structure and function.
  • Analysis of conserved catalytic mechanisms and substrate recognition.
  • Exploration of evolutionary variations in RNase P holoenzymes.

Main Results:

  • RNase P exists as canonical ribonucleoprotein complexes and recently discovered RNA-free forms.
  • Structural diversity impacts RNA-protein and protein-protein interactions for conserved function.
  • RNase P demonstrates functional interchangeability and potential for diverse applications.

Conclusions:

  • Understanding RNase P structural diversity is key to its conserved function.
  • RNase P's adaptability supports its utility in clinical and biotechnological applications.
  • Further research into RNase P variations can unlock new therapeutic and industrial uses.