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Related Concept Videos

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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Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
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Termination of Translation01:44

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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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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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Initiation of Translation02:33

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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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Related Experiment Video

Updated: Apr 27, 2026

Polysome Fractionation and Analysis of Mammalian Translatomes on a Genome-wide Scale
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Ribosome recycling induces optimal translation rate at low ribosomal availability.

E Marshall1, I Stansfield2, M C Romano3

  • 1Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, UK SUPA, Institute for Complex Systems and Mathematical Biology, King's College, University of Aberdeen, Aberdeen AB24 3UE, UK emarshall@abdn.ac.uk.

Journal of the Royal Society, Interface
|July 11, 2014
PubMed
Summary

Ribosome recycling enhances protein synthesis efficiency by creating a closed-loop model. This process optimizes ribosome flow and can lead to maximal protein production at specific ribosome concentrations.

Keywords:
ABCE1Rli1ribosome recyclingtotally asymmetric simple exclusion processtranslation

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Single Molecule Fluorescence Energy Transfer Study of Ribosome Protein Synthesis
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Area of Science:

  • Molecular Biology
  • Biophysics
  • Computational Biology

Background:

  • Eukaryotic protein synthesis involves messenger RNA (mRNA) and ribosomes.
  • Ribosome recycling at the 3' end of mRNA promotes translation re-initiation, forming a 'closed-loop' model.
  • Understanding translation dynamics is crucial for cellular efficiency.

Purpose of the Study:

  • To investigate the impact of ribosome recycling on the dynamics of translation.
  • To analyze ribosome flow, density, and protein production using a computational model.
  • To explore phase transitions and optimal conditions for protein synthesis.

Main Methods:

  • Utilizing a driven diffusion lattice model to simulate translation dynamics.
  • Analyzing the effects of varying ribosome recycling rates and initiation rates.
  • Examining phase transitions in ribosome density and current.

Main Results:

  • Ribosome recycling significantly increases ribosome current on mRNA.
  • The presence of recycling alters phase transitions, preventing direct shifts from low to high ribosome density.
  • A maximal current phase becomes accessible at lower initiation rates.
  • Protein production can peak at low initiation rates, with decreased efficiency at higher rates.

Conclusions:

  • Ribosome recycling is a key factor in optimizing translational efficiency.
  • The closed-loop model suggests an optimal ribosome concentration for maximal protein synthesis.
  • Deviations from this optimum can impair translational efficiency, impacting gene expression.