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Related Concept Videos

The Central Dogma01:25

The Central Dogma

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From DNA to Protein03:06

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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...
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The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
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Related Experiment Video

Updated: Jul 2, 2026

Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses
11:19

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A tripeptide 'anticodon' deciphers stop codons in messenger RNA.

K Ito1, M Uno, Y Nakamura

  • 1Department of Tumor Biology, Institute of Medical Science, University of Tokyo, Japan.

Nature
|February 25, 2000
PubMed
Summary

Bacterial release factors (RF1 and RF2) recognize stop codons through specific amino acid tripeptides. These tripeptides, like tRNA anticodons, decipher stop codon bases, ensuring accurate protein synthesis termination.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Prokaryotic translational release factors RF1 and RF2 terminate polypeptide synthesis.
  • RF1 recognizes UAG/UAA, while RF2 recognizes UGA/UAA stop codons.
  • The mechanism by which these factors read identical and non-identical stop codons remained unclear.

Purpose of the Study:

  • To elucidate the molecular basis of stop codon recognition by prokaryotic release factors.
  • To identify the specific domains and amino acid sequences responsible for release factor specificity.

Main Methods:

  • Construction of RF1-RF2 hybrid release factors with swapped conserved domains.
  • Genetic selection to identify functional variants of the specificity-determining domain.
  • In vitro release assays using purified release factors and stop codon variants.
  • Analysis of stop codon recognition using base analogues.

Main Results:

  • A specific domain swap in RF1-RF2 hybrids altered stop codon recognition specificity.
  • The tripeptides Pro-Ala-Thr (in RF1) and Ser-Pro-Phe (in RF2) were identified as key determinants of specificity.
  • The first and third amino acids of these tripeptides independently discriminate the second and third purine bases of stop codons.
  • The C2 amino group of purines is likely the primary target for distinguishing guanine (G) from adenine (A).

Conclusions:

  • Bacterial release factors utilize a discriminator tripeptide for stop codon recognition.
  • This tripeptide functions analogously to the anticodon in transfer RNA, despite being protein-based.
  • The findings reveal a novel mechanism for protein-RNA interaction in decoding genetic information.