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Related Concept Videos

Leaky Scanning02:28

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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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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.
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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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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...
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Related Experiment Video

Updated: Mar 5, 2026

Residue-specific Incorporation of Noncanonical Amino Acids into Model Proteins Using an Escherichia coli Cell-free Transcription-translation System
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A close-up view of codon selection in eukaryotic initiation.

Christoffer Lind1, Mauricio Esguerra1, Johan Åqvist1

  • 1a Department of Cell and Molecular Biology , Uppsala University , Uppsala , Sweden.

RNA Biology
|March 25, 2017
PubMed
Summary

The ribosome rapidly identifies the correct genetic codon for protein synthesis. Initiation factors eIF1 and eIF1A fine-tune base-pairing energetics, ensuring accurate codon recognition during eukaryotic translation initiation.

Keywords:
Codon selectionmolecular dynamics simulationribosomestart codontranslation initiation

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Area of Science:

  • Molecular Biology
  • Computational Biology
  • Biophysics

Background:

  • Eukaryotic translation initiation requires rapid and accurate codon recognition.
  • The ribosome must efficiently select the correct codon without pausing.

Purpose of the Study:

  • To computationally investigate how the eukaryotic translation machinery recognizes specific codons.
  • To elucidate the role of initiation factors in codon discrimination.

Main Methods:

  • Simulations of codon recognition in atomic detail using a 3D structure of the eukaryotic initiation complex.
  • Analysis of the energetic landscape of base-pairing.

Main Results:

  • Initiation factors eIF1 and eIF1A fine-tune base-pairing energetics to enhance codon recognition accuracy.
  • Computational models reveal mechanisms for discriminating against near-cognate codons.

Conclusions:

  • The initiation machinery employs energetic fine-tuning for precise codon selection.
  • eIF1 and eIF1A are crucial for ensuring fidelity in eukaryotic translation initiation.