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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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Transcription Attenuation in Prokaryotes02:42

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Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
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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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Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
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Types of RNA01:23

Types of RNA

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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 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.
RNA...
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Riboswitches01:56

Riboswitches

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Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
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Updated: Jun 14, 2025

An In Vitro Assay to Detect tRNA-Isopentenyl Transferase Activity
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An In Vitro Assay to Detect tRNA-Isopentenyl Transferase Activity

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Temperature-Dependent tRNA Modifications in Bacillales.

Anne Hoffmann1,2, Christian Lorenz3, Jörg Fallmann2

  • 1Helmholtz Institute for Metabolic, Obesity and Vascular Research, Helmholtz Zentrum München of the University of Leipzig and University Hospital Leipzig, Philipp-Rosenthal-Str. 27, D-04103 Leipzig, Germany.

International Journal of Molecular Sciences
|August 29, 2024
PubMed
Summary
This summary is machine-generated.

Transfer RNA (tRNA) modifications adapt bacteria to different temperatures. Thermophiles show increased modifications like 4-thiouridine (s⁴U) for heat tolerance, while cold-adapted bacteria use dihydrouridine (D) for flexibility.

Keywords:
RNA modificationRNA sequencingbacteriatRNAthermal adaption

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Area of Science:

  • Molecular Biology
  • Microbiology
  • Genomics

Background:

  • Transfer RNA (tRNA) modifications are crucial for regulating RNA structure and function.
  • These modifications are vital for organisms adapting to extreme temperatures, influencing transcript rigidity and flexibility.

Purpose of the Study:

  • To investigate how specific tRNA modifications adapt to different bacterial growth temperatures (psychrophilic, mesophilic, thermophilic).
  • To understand the role of tRNA modifications in bacterial thermotolerance and cold adaptation.

Main Methods:

  • Employed an RNA sequencing approach combined with chemical pre-treatment of tRNA samples.
  • Systematically profiled four key tRNA modifications: dihydrouridine (D), 4-thiouridine (s⁴U), 7-methyl-guanosine (m⁷G), and pseudouridine (Ψ) at single-nucleotide resolution.
  • Compared tRNA modification profiles across psychrophilic (P. halocryophilus, E. sibiricum), mesophilic (B. subtilis), and thermophilic (G. stearothermophilus) Bacillales.

Main Results:

  • Each bacterium displayed a unique tRNA modification profile, despite close phylogenetic relationships.
  • Thermophilic bacteria showed increased tRNA modifications at optimal temperatures, notably higher s⁴U8 and Ψ55 levels, suggesting a role in thermotolerance.
  • Psychrophilic and mesophilic bacteria exhibited higher D modifications, indicating an adaptive strategy for cold environments by enhancing tRNA flexibility.

Conclusions:

  • Bacterial tRNA modification patterns are uniquely adapted to specific growth temperatures.
  • Specific modifications like s⁴U and Ψ contribute to thermotolerance, while D enhances flexibility in cold-adapted organisms.
  • The developed RNA sequencing method is effective for precise tRNA profiling.