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Related Concept Videos

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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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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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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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
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Related Experiment Video

Updated: Feb 24, 2026

Discrimintion and Mapping of the Primary and Processed Transcripts in Maize Mitochondrion Using a Circular RT-PCR-based Strategy
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Optimal Translation Along a Circular mRNA.

Yoram Zarai1, Alexander Ovseevich2, Michael Margaliot3

  • 1School of Electrical Engineering, Tel-Aviv University, Tel-Aviv, Israel.

Scientific Reports
|August 27, 2017
PubMed
Summary
This summary is machine-generated.

We developed a new spectral method for optimizing ribosome production rates in circular mRNA. This approach simplifies calculations and improves gene engineering efficiency by ensuring a unique, stable solution.

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Area of Science:

  • Systems Biology
  • Molecular Biology
  • Computational Biology

Background:

  • The ribosome flow model on a ring (RFMR) simulates ribosome movement on circular mRNA.
  • Understanding optimal protein synthesis is crucial for gene expression and metabolic engineering.

Purpose of the Study:

  • To derive a novel spectral representation for optimal steady-state production rate and ribosomal density in the RFMR.
  • To develop efficient algorithms for calculating optimal translation parameters and their sensitivities.

Main Methods:

  • Derivation of a spectral representation for RFMR.
  • Development of numerically stable algorithms for optimization.
  • Analysis of the concavity of the production rate function.

Main Results:

  • A new spectral representation for optimal steady-state production rate and ribosomal density was derived.
  • The method provides a simple, stable algorithm for long mRNA rings.
  • Efficient computation of sensitivity to transition rates is enabled.
  • Optimal production rate is a strictly concave function of transition rates.

Conclusions:

  • The derived representation transforms the optimization problem into a convex one with a unique solution.
  • This facilitates efficient numerical determination of optimal gene expression parameters.
  • Results have implications for re-engineering heterologous genes and understanding translation.