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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

From DNA to Protein

From DNA to Protein

The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...

Translation

Translation

Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of...

Translation

Translation

Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Proteins are...

Initiation of Translation

Initiation of Translation

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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Related Experiment Video

Updated: May 2, 2026

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

RNA-directed amino acid coupling as a model reaction for primitive coded translation.

Kazuo Harada¹, Shoko Aoyama, Akimasa Matsugami

¹Department of Life Sciences, Tokyo Gakugei University, 4-1-1 Nukuikita-machi, Koganei, Tokyo 184-8501 (Japan). harada@u-gakugei.ac.jp.

Chembiochem : a European Journal of Chemical Biology

|March 5, 2014

Summary

This study demonstrates how RNA can position amino acids for sequence-specific coupling, offering insights into the origin of translation and the RNA world. RNA

Keywords:

RNA recognition RNA-amino acid interactions molecular evolution peptide bond formation translation

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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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Published on: August 1, 2016

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Optimizing the Genetic Incorporation of Chemical Probes into GPCRs for Photo-crosslinking Mapping and Bioorthogonal Chemistry in Live Mammalian Cells

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Published on: April 9, 2018

Area of Science:

Origin of Life Research
Molecular Biology
Biochemistry

Background:

The stereochemical theory proposes early translation involved RNA-directed amino acid coupling.
Understanding the RNA world is crucial for deciphering life's origins.

Purpose of the Study:

To investigate RNA's potential role in early amino acid coupling.
To demonstrate RNA's ability to position and facilitate peptide bond formation.

Main Methods:

Utilized the HIV Tat aptamer RNA and Tat peptide.
Assessed RNA's recognition of consecutive arginine residues.
Examined RNA's templating effect on amino acid coupling.

Main Results:

The HIV Tat aptamer RNA recognizes two consecutive arginine residues in the Tat peptide.
This RNA acts as a template, accelerating arginine residue coupling to a peptide primer.

Conclusions:

RNA can position amino acids for sequence-specific coupling, supporting early translation theories.
Findings provide a potential mechanism for RNA-templated peptide synthesis in the RNA world.