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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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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
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
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RNA Structure01:23

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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.
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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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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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Related Experiment Video

Updated: Mar 10, 2026

In vitro tRNA Methylation Assay with the Entamoeba histolytica DNA and tRNA Methyltransferase Dnmt2 Ehmeth Enzyme
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In vitro tRNA Methylation Assay with the Entamoeba histolytica DNA and tRNA Methyltransferase Dnmt2 Ehmeth Enzyme

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Testosterone and its dimers alter tRNA morphology.

P Chanphai1, D Agudelo1, A R Vesper1

  • 1Department of Chemistry-Biochemistry and Physics, University of Québec at Trois-Rivières, C.P. 500, Trois-Rivières, Québec G9A 5H7, Canada.

Journal of Pharmaceutical and Biomedical Analysis
|December 9, 2016
PubMed
Summary

Testosterone and its dimers bind to transfer RNA (tRNA) bases, altering its structure. Testosterone dimers show higher binding affinity, with observed tRNA encapsulation of the steroid.

Keywords:
ConjugationMorphologyTEMTestosteroneTestosterone dimerstRNA

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Transfer RNA (tRNA) plays a crucial role in protein synthesis.
  • Steroid hormones, like testosterone, influence various cellular processes.
  • Understanding molecular interactions between steroids and nucleic acids is vital.

Purpose of the Study:

  • To investigate the structural changes in tRNA upon conjugation with testosterone and its dimers.
  • To determine the binding sites and affinity of testosterone to tRNA.
  • To explore the morphological impact of steroid-tRNA interaction.

Main Methods:

  • Multiple spectroscopic methods (e.g., UV-Vis, fluorescence).
  • Transmission Electron Microscopy (TEM) for morphological analysis.
  • Molecular modeling for structural insights.

Main Results:

  • Testosterone binds to specific tRNA bases (A62, A64, C60, C61, C63, G51, U50, U59).
  • Binding affinity order: testosterone dimer-aromatic > testosterone dimer-aliphatic > testosterone.
  • Steroid loading efficacy ranged from 35-45%.
  • TEM revealed increased tRNA aggregate diameter, suggesting testosterone encapsulation.

Conclusions:

  • Testosterone and its dimers interact with tRNA, inducing significant morphological changes.
  • The study elucidates specific binding interactions and relative affinities.
  • tRNA can encapsulate testosterone, highlighting a novel interaction mechanism.