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Related Experiment Video

Updated: Jul 6, 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

[Non-standard genetic codes and translation termination].

Molekuliarnaia Biologiia

|March 6, 2008

Summary

The genetic code isn't universal; stop codons can be reassigned in non-standard codes. Altered termination factor specificity may drive these changes, impacting protein synthesis.

Area of Science:

Genetics
Molecular Biology
Evolutionary Biology

Background:

The genetic code, while largely universal, exhibits variations in certain genomes.
Stop codons, typically signaling translation termination, are susceptible to reassignment as sense codons.

Purpose of the Study:

To explore the phenomenon of non-standard genetic codes and stop codon reassignment.
To investigate the role of class-1 termination factors in these variations.
To describe hypotheses regarding the origin of non-standard genetic codes.

Main Methods:

Analysis of genetic code variations across different organisms (mitochondrial, prokaryotic, eukaryotic).
Examination of the function and specificity of class-1 termination factors (RF1, RF2, eRF1).

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Last Updated: Jul 6, 2026

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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Review of proposed hypotheses for the evolution of non-standard genetic codes.

Main Results:

Non-standard genetic codes are found in various genomes, with stop codons reassigned to sense codons.
Class-1 termination factors exhibit altered specificity in organisms with non-standard codes.
Pyrrolysine and selenocysteine utilize distinct decoding mechanisms.

Conclusions:

Specificity alteration in class-1 release factors is a proposed key event in stop codon reassignment.
Understanding these variations provides insights into the evolution of the genetic code and protein synthesis.