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Related Concept Videos

Types of RNA01:23

Types of RNA

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Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
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Types of RNA01:20

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Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
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Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
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Related Experiment Video

Updated: Mar 28, 2026

Large-scale Production of Recombinant RNAs on a Circular Scaffold Using a Viroid-derived System in Escherichia coli
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Large-scale Production of Recombinant RNAs on a Circular Scaffold Using a Viroid-derived System in Escherichia coli

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RNAi: prokaryotes get in on the act.

John van der Oost1, Stan J J Brouns

  • 1Laboratory of Microbiology, Wageningen University, 6703 HB Wageningen, Netherlands. john.vanderoost@wur.nl

Cell
|December 1, 2009
PubMed
Summary

CRISPR-Cas systems offer adaptive immunity in microbes. A new variant in Pyrococcus furiosus targets RNA, not DNA, expanding the known functions of these defense mechanisms.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • CRISPR-Cas systems are prokaryotic adaptive immune mechanisms.
  • These systems typically target foreign DNA using CRISPR-derived RNAs.
  • Previous research focused on DNA targeting by CRISPR-associated (Cas) proteins.

Discussion:

  • Hale et al. (2009) identified a novel CRISPR-Cas complex in the archaeon Pyrococcus furiosus.
  • This system utilizes guide RNAs to direct Cas proteins.
  • The complex exhibits RNA-targeting activity, a departure from canonical DNA targeting.

Key Insights:

  • Discovery of an RNA-targeting CRISPR-Cas variant.
  • Demonstration of RNA cleavage by a CRISPR-Cas complex.
  • Expansion of the known functional repertoire of CRISPR-Cas systems.

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Isolation of Cognate RNA-protein Complexes from Cells Using Oligonucleotide-directed Elution
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Isolation of Cognate RNA-protein Complexes from Cells Using Oligonucleotide-directed Elution

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Related Experiment Videos

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Isolation of Cognate RNA-protein Complexes from Cells Using Oligonucleotide-directed Elution
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Outlook:

  • Implications for understanding microbial immunity.
  • Potential for new RNA-targeting biotechnological tools.
  • Further investigation into diverse CRISPR-Cas functions across archaea and bacteria.