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tRNA Activation

tRNA Activation

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...

tRNA Activation

tRNA Activation

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...

Improving Translational Accuracy

Improving Translational Accuracy

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...

Transfer RNA Synthesis

Transfer RNA Synthesis

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...

Transfer RNA Synthesis

Transfer RNA Synthesis

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...

ATP and Macromolecule Synthesis

ATP and Macromolecule Synthesis

Biological macromolecules are organic compounds, predominantly composed of carbon atoms. The carbon atoms are covalently bonded with hydrogen, oxygen, nitrogen, and other minor elements. There are four major biological macromolecule classes: carbohydrates, lipids, proteins, and nucleic acids.
Most macromolecules are composed of single subunits, or building blocks, called monomers. The monomers combine with each other using covalent bonds to form larger molecules known as polymers.
Conversion of...

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Related Experiment Video

Updated: Jul 4, 2026

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

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

Published on: June 18, 2010

Aminoacyl-tRNA synthetase complexes: molecular multitasking revealed.

Corinne D Hausmann¹, Michael Ibba

¹Department of Microbiology, The Ohio State University, Columbus, OH 43210-1292, USA.

FEMS Microbiology Reviews

|June 5, 2008

Summary

Aminoacyl-tRNA synthetases (aaRSs) are crucial for protein synthesis and form complexes involved in diverse cellular processes beyond translation. These multiprotein complexes highlight the extensive connections between the translational machinery and other essential cellular functions across all domains of life.

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

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Area of Science:

Molecular Biology
Cellular Biology
Biochemistry

Background:

Accurate protein synthesis, directed by mRNA, is vital for cell growth and survival.
Aminoacyl-tRNA synthetases (aaRSs) are key enzymes that attach the correct amino acid to its corresponding tRNA molecule, forming aminoacyl-tRNAs for polypeptide chain elongation.

Purpose of the Study:

To provide an overview of the multiprotein complexes formed by aaRSs in all three domains of life.
To demonstrate the extensive network of connections between the translational machinery and other cellular components.

Main Methods:

Literature review and synthesis of existing research on aaRS complexes.
Comparative analysis of aaRS complex functions across different domains of life.

Main Results:

aaRSs associate with proteins in higher-order complexes beyond their canonical role in translation.
These multiprotein complexes are conserved across bacteria, archaea, and eukaryotes.
aaRS complexes are implicated in diverse cellular processes including splicing, apoptosis, viral assembly, and gene regulation.

Conclusions:

aaRSs play multifaceted roles extending far beyond protein synthesis.
The involvement of aaRSs in various cellular pathways underscores their importance in maintaining cellular homeostasis and function.
Understanding these complexes provides insights into the intricate regulation of cellular processes and potential therapeutic targets.