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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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Ribosome Profiling02:24

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Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
Applications of ribosome profiling
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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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RNA Stability01:53

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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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Improving Translational Accuracy02:07

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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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Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
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Related Experiment Video

Updated: May 30, 2025

An In Vitro Assay to Detect tRNA-Isopentenyl Transferase Activity
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Genome-wide profiling of tRNA modifications by Induro-tRNAseq reveals coordinated changes.

Yuko Nakano1, Howard Gamper1, Henri McGuigan1

  • 1Department of Biochemistry and Molecular Biology, Thomas Jefferson University, Philadelphia, PA, USA.

Nature Communications
|January 26, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces Induro-tRNAseq, a new method using Induro reverse transcriptase (RT) to map genome-wide tRNA modifications. It overcomes challenges in reading modified tRNAs, revealing stable modification patterns essential for protein homeostasis.

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Author Spotlight: AQRNA-seq Role in Mapping Small RNAs and Unraveling Protein Translation Mechanisms
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Area of Science:

  • Molecular Biology
  • Genomics
  • Epigenetics

Background:

  • Post-transcriptional modifications of transfer RNAs (tRNAs) are crucial for gene expression regulation.
  • Mapping these modifications is challenging due to reverse transcriptase (RT) readthrough difficulties.
  • Existing methods struggle to accurately quantify tRNA modifications genome-wide.

Purpose of the Study:

  • To develop and validate a novel method for mapping and quantifying genome-wide tRNA modifications.
  • To overcome the limitations of reverse transcriptase readthrough in modified tRNAs.
  • To analyze the landscape and stability of tRNA modifications across different human and mouse tissues.

Main Methods:

  • Utilized Induro, a group-II intron-encoded RT, within the Induro-tRNAseq method.
  • Induro-tRNAseq selectively overcomes RT stops at modification sites without increasing misincorporation.
  • Performed comparative analysis of Induro against a related RT and assessed modifications across five human cell lines and three mouse tissues.

Main Results:

  • Induro-tRNAseq enables progressive readthrough of tRNA modifications over time.
  • Comparative analysis provides datasets for predicting modification impacts.
  • Identified a highly variable landscape of tRNA modifications across tRNA sequences.
  • Observed stabilization of modifications critical for genetic code reading.

Conclusions:

  • Induro-tRNAseq is an effective tool for mapping and quantifying genome-wide tRNA modifications.
  • T નિયમન (tRNA modification) patterns are dynamic yet stabilized for essential functions.
  • Coordinated changes in tRNA modifications are vital for protein homeostasis and cellular function.