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Related Concept Videos

tRNA Activation02:26

tRNA Activation

19.0K
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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Types of RNA01:20

Types of RNA

5.7K
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 regulating 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 Performs Diverse...
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Amino Acid Biosynthetic Pathways01:29

Amino Acid Biosynthetic Pathways

3
Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which...
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Nucleic Acid Structure01:25

Nucleic Acid Structure

6.0K
The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA...
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Related Experiment Video

Updated: Jun 11, 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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Aminoacyl-tRNA synthetases.

Rasangi Tennakoon1, Haissi Cui1

  • 1Department of Chemistry, University of Toronto, Toronto, Canada.

Current Biology : CB
|October 8, 2024
PubMed
Summary

Aminoacyl-tRNA synthetases are crucial enzymes that translate the genetic code. These essential proteins have evolved diverse functions beyond their primary role in protein synthesis.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Background:

  • Aminoacyl-tRNA synthetases (aaRSs) are essential enzymes that link amino acids to their corresponding transfer RNAs (tRNAs).
  • They play a critical role in maintaining the fidelity of the genetic code during protein synthesis.
  • The active sites of aaRSs are highly conserved due to their fundamental role in translation.

Purpose of the Study:

  • To provide an overview of the diverse functions of aminoacyl-tRNA synthetases.
  • To highlight the evolutionary expansion of aaRS functions beyond translation.
  • To explore newly discovered roles of these enzymes.

Main Methods:

  • Literature review of existing research on aminoacyl-tRNA synthetases.
  • Analysis of evolutionary pathways and functional diversification of aaRSs.

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Residue-specific Incorporation of Noncanonical Amino Acids into Model Proteins Using an Escherichia coli Cell-free Transcription-translation System
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Residue-specific Incorporation of Noncanonical Amino Acids into Model Proteins Using an Escherichia coli Cell-free Transcription-translation System

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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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Related Experiment Videos

Last Updated: Jun 11, 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

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Residue-specific Incorporation of Noncanonical Amino Acids into Model Proteins Using an Escherichia coli Cell-free Transcription-translation System
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Residue-specific Incorporation of Noncanonical Amino Acids into Model Proteins Using an Escherichia coli Cell-free Transcription-translation System

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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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  • Synthesis of information on both canonical and non-canonical functions.

    • Main Results:

    • Aminoacyl-tRNA synthetases are key to deciphering the genetic code, assigning amino acids to codons.
    • These enzymes ensure protein synthesis accuracy by correctly matching amino acids to tRNAs.
    • Over evolutionary time, aaRSs have acquired novel functions beyond their initial role in translation.

    Conclusions:

    • Aminoacyl-tRNA synthetases are versatile enzymes with critical roles in fundamental biological processes.
    • Their functions have expanded significantly since their evolutionary origin.
    • Understanding the diverse roles of aaRSs is vital for comprehending cellular mechanisms and disease.