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Related Concept Videos

Initiation of Translation02:33

Initiation of Translation

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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.
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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Leaky Scanning02:28

Leaky Scanning

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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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Improving Translational Accuracy02:07

Improving Translational Accuracy

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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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From DNA to Protein03:06

From DNA to Protein

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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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Regulation of Expression at Multiple Steps01:23

Regulation of Expression at Multiple Steps

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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Termination of Translation01:44

Termination of Translation

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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 8, 2025

Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs
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Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs

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Synonymous codon usage regulates translation initiation.

Chloe L Barrington1, Gabriel Galindo2, Amanda L Koch2

  • 1Department of Biochemistry & Molecular Genetics, University of Colorado School of Medicine, Aurora, CO 80045, USA; RNA Bioscience Initiative, University of Colorado School of Medicine, Aurora, CO 80045, USA.

Cell Reports
|December 14, 2023
PubMed
Summary
This summary is machine-generated.

Nonoptimal synonymous codons reduce gene expression by repressing translation initiation, not just mRNA degradation. This codon usage regulation impacts protein levels through reduced initiation rates and factor binding.

Keywords:
CNOT3CP: Molecular biologycodon optimalitydeadenylationeIF4Egene regulationmRNA decayribosometranslation initiationtranslational repression

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Last Updated: Jul 8, 2025

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Area of Science:

  • Molecular Biology
  • Genetics
  • Gene Expression Regulation

Background:

  • Synonymous codon usage influences gene expression, with nonoptimal codons previously linked to slower translation and mRNA decay.
  • However, transcript levels alone do not fully explain observed protein abundance variations, suggesting additional regulatory layers.

Purpose of the Study:

  • To investigate the mechanisms by which codon usage impacts protein levels beyond mRNA degradation.
  • To determine if nonoptimal codons affect translation initiation rates.

Main Methods:

  • Utilized reporter systems in human and Drosophila cells to quantify protein and transcript levels.
  • Assessed the binding of translation initiation factors (eIF4E, eIF4G1) to nonoptimal transcripts.

Main Results:

  • Codon usage variation explains less than half of protein abundance differences through transcript levels.
  • Nonoptimal codons significantly repress translation initiation, independent of mRNA decay.
  • Nonoptimal transcripts exhibit reduced binding to translation initiation factors eIF4E and eIF4G1.

Conclusions:

  • Nonoptimal synonymous codons represent a potent regulatory mechanism by repressing translation initiation.
  • This repression occurs independently of mRNA decay and deadenylation, and does not involve CNOT3.
  • Codon usage directly modulates protein synthesis rates through translation initiation efficiency.