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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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DNA Bacteriophages01:26

DNA Bacteriophages

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Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
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Initiation of Translation02:33

Initiation of Translation

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Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
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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
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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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Updated: Sep 19, 2025

Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses
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Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses

Published on: February 25, 2011

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Phage tRNAs: decoding the enigma.

Daan F van den Berg1, Stan J J Brouns1

  • 1Department of Bionanoscience, Delft University of Technology, 2629, HZ, Delft, The Netherlands; Kavli Institute of Nanoscience, Delft, The Netherlands.

Trends in Microbiology
|June 18, 2025
PubMed
Summary
This summary is machine-generated.

Bacteriophage tRNAs (transfer RNAs) are essential for phage infection, aiding in translation and evading host defenses. Understanding these phage tRNAs can lead to improved phage therapeutics against bacterial infections.

Keywords:
anti-defense genescodon compensationdefense systemsintegration sitephage tRNAstRNA host–phage conflict

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Bacteriophages (phages) possess transfer RNAs (tRNAs) in their genomes, challenging early beliefs that they solely used host tRNAs for translation.
  • Diverse phage lifestyles correlate with distinct tRNA utilization strategies, indicating complex roles beyond basic translation.

Purpose of the Study:

  • To review the multifaceted roles of phage tRNAs in various stages of phage infection.
  • To explore how phage tRNAs contribute to evading host defense mechanisms.
  • To discuss the implications of phage tRNA research for developing phage-based therapeutics.

Main Methods:

  • Literature review of studies on bacteriophage tRNAs.
  • Analysis of existing data on phage tRNA functions and host interactions.
  • Synthesis of current knowledge on phage tRNA roles in infection and defense evasion.

Main Results:

  • Phage tRNAs are actively involved in translation and play a critical role in overcoming host defense systems.
  • Different phages employ their tRNAs in unique ways, depending on their specific life cycles and hosts.
  • Host responses to phage tRNAs are being elucidated, revealing intricate molecular interactions.

Conclusions:

  • Phage tRNAs are key players in phage biology, essential for successful infection and propagation.
  • Understanding phage tRNA mechanisms offers a promising avenue for enhancing phage therapy efficacy against bacterial pathogens.