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Related Concept Videos

RNA Structure01:23

RNA Structure

Overview
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.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
RNA Structure01:19

RNA Structure

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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Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

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.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
Eukaryotic RNA Polymerases00:58

Eukaryotic RNA Polymerases

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...
Transcription Initiation01:47

Transcription Initiation

Initiation is the first step of transcription in eukaryotes. Prokaryotic RNA Polymerase (RNAP) can bind to the template DNA and start transcribing. On the other hand, transcription in eukaryotes requires additional proteins, called transcription factors, to first bind to the promoter region in the DNA template. This binding helps recruit the specific RNAP that can assemble on the DNA and start transcription.
The promoters and enhancers and their accessory proteins allow tight regulation of...
RNA Stability01:53

RNA Stability

Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...

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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
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Modeling the Thermoproteaceae RNase P RNA.

Patricia P Chan1, James W Brown, Todd M Lowe

  • 1Department of Biomolecular Engineering, University of California Santa Cruz, CA, USA.

RNA Biology
|September 29, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to detect small archaeal RNase P RNAs. This advancement identified four new RNase P RNA genes in Thermoproteaceae, improving our understanding of tRNA maturation across life.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Bioinformatics

Background:

  • The RNase P complex's RNA component is crucial for tRNA maturation across life.
  • Variations in RNase P RNA necessitate diverse search models for accurate detection.
  • Existing Rfam models fail to identify diminutive archaeal Type T RNase P RNAs.

Purpose of the Study:

  • To develop a novel Rfam search model for efficient detection of archaeal Type T RNase P RNAs.
  • To establish reliable score detection thresholds for the new model.
  • To identify new RNase P RNA genes in archaeal genomes.

Main Methods:

  • Development of a new Rfam covariance search model tailored for Type T RNase P RNAs.
  • Application of the new model to analyze recently completed archaeal genomes.
  • Establishment of score detection thresholds for accurate gene identification.

Main Results:

  • A new Rfam search model was successfully created for detecting diminutive archaeal RNase P RNAs.
  • Effective score detection thresholds were established for the new model.
  • Four novel RNase P RNA genes were identified in the Thermoproteaceae family.

Conclusions:

  • The new Rfam model significantly enhances the detection of archaeal Type T RNase P RNAs.
  • This discovery expands the known repertoire of RNase P RNA genes in Archaea.
  • The findings contribute to a deeper understanding of tRNA biogenesis in archaeal lineages.