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Related Concept Videos

tRNA Activation02:26

tRNA Activation

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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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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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Improving Translational Accuracy02:07

Improving Translational Accuracy

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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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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
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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Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

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The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
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Termination of Translation01:44

Termination of Translation

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The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
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Related Experiment Video

Updated: Jun 21, 2025

Genome-wide Analysis of Aminoacylation Charging Levels of tRNA Using Microarrays
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Genome-wide Analysis of Aminoacylation Charging Levels of tRNA Using Microarrays

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Lost in translation: How neurons cope with tRNA decoding.

Wei Guo1,2,3, Stefano Russo1,2,3, Francesca Tuorto2,3

  • 1Faculty of Biosciences, Heidelberg University, Heidelberg, Germany.

Bioessays : News and Reviews in Molecular, Cellular and Developmental Biology
|July 11, 2024
PubMed
Summary
This summary is machine-generated.

Transfer RNA (tRNA) modifications are crucial for efficient protein translation and neuronal health. Disruptions in tRNA modifications impact brain development and neurological disorders by affecting protein synthesis and cellular stress responses.

Keywords:
local translationneurological disordersno‐go mRNA decayprotein translationribosome quality controltRNA modificationsunfolded protein response

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Area of Science:

  • Molecular Biology
  • Neuroscience
  • Genetics

Background:

  • Post-transcriptional modifications of transfer RNAs (tRNAs) are essential for accurate codon recognition and tRNA stability, influencing protein synthesis.
  • Emerging evidence links tRNA modifications and their modifying enzymes to critical processes in brain development and the etiology of neurological disorders.
  • Deficiencies in tRNA modifications can impair codon recognition and decoding, leading to protein aggregation and triggering cellular stress responses with detrimental effects.

Purpose of the Study:

  • To review the specific roles of tRNA modifications in neuronal physiology and pathology.
  • To explore how tRNA modifications fine-tune local translation within neurons.
  • To discuss the impact of tRNA modifications on protein translation and associated cellular mechanisms in the nervous system.

Main Methods:

  • Literature review focusing on molecular and cellular functions of tRNA modifications.
  • Analysis of existing research on tRNA modification links to neurological disorders.
  • Discussion of mechanisms such as unfolded protein response (UPR), ribosome quality control (RQC), and no-go mRNA decay (NGD) in the context of neuronal function.

Main Results:

  • TRNA modifications play a significant role in regulating local translation in neurons.
  • Specific tRNA modifications are implicated in both the normal functioning and disease states of the nervous system.
  • Dysregulation of tRNA modifications can affect protein translation and activate stress response pathways like UPR, RQC, and NGD, impacting neuronal health.

Conclusions:

  • TRNA modifications are critical regulators of protein translation in the nervous system.
  • Understanding the interplay between tRNA modifications and the translational machinery is key to deciphering their roles in neurological health and disease.
  • Further research into tRNA modifications offers potential therapeutic avenues for neurological disorders.