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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...

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...

RNA Structure

RNA Structure

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...

RNA Structure

RNA Structure

Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. 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): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...

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Related Experiment Video

Updated: Jul 14, 2026

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

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

Published on: February 25, 2011

Novel tRNA aminoacylation mechanisms.

Terry Cathopoulis¹, Pitak Chuawong, Tamara L Hendrickson

¹Department of Chemistry, Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218, USA.

Molecular Biosystems

|May 30, 2007

Summary

Proteins incorporate 22 amino acids using specific transfer RNAs (tRNAs). Aminoacyl-tRNA synthetases (aaRSs) usually create these, but sometimes collaborate to form non-canonical aminoacyl-tRNAs.

Area of Science:

Biochemistry
Molecular Biology
Genetics

Background:

Ribosomal protein synthesis utilizes 20 common amino acids, plus selenocysteine and pyrrolysine.
Aminoacyl-transfer RNAs (aa-tRNAs) are crucial for inserting these amino acids into proteins.
Aminoacyl-tRNA synthetases (aaRSs) are typically responsible for aa-tRNA biosynthesis.

Purpose of the Study:

To investigate the mechanisms of non-canonical aminoacyl-tRNA synthesis.
To understand the role of aaRSs with relaxed or novel substrate specificities.
To explore the generation of canonical and non-canonical aminoacyl-tRNAs.

Main Methods:

Analysis of aminoacyl-tRNA synthetase (aaRS) activity.
Enzymatic assays for aa-tRNA formation.

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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

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

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

Published on: August 1, 2016

Related Experiment Videos

Last Updated: Jul 14, 2026

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

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

Published on: February 25, 2011

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

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

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

Published on: August 1, 2016

Investigating aaRS substrate specificity.

Studying enzyme cooperation in aa-tRNA biosynthesis.

Main Results:

Identified instances where aaRSs exhibit relaxed or novel substrate specificities.
Demonstrated cooperation between aaRSs and other enzymes.
Showcased the generation of specific canonical and non-canonical aa-tRNAs through these collaborative pathways.

Conclusions:

aaRSs with altered specificities play a key role in expanding the amino acid repertoire.
Enzyme cooperation is a viable strategy for producing diverse aa-tRNAs.
This expands our understanding of the flexibility and adaptability of protein synthesis.