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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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Prokaryote translation is a complex, highly coordinated process that converts genetic information from mRNA into functional proteins. It involves three stages: initiation, elongation, and termination, each facilitated by specific molecular components.Initiation of TranslationThe process begins with the assembly of the ribosomal subunits and initiation factors on the mRNA. In bacteria, the 30S ribosomal subunit recognizes the Shine-Dalgarno sequence in the mRNA, a conserved region upstream of...
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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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Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses
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Power series method for solving TASEP-based models of mRNA translation.

S Scott1, J Szavits-Nossan1,2

  • 1SUPA, School of Physics and Astronomy, University of Edinburgh, Peter Guthrie Tait Road, Edinburgh EH9 3FD, United Kingdom.

Physical Biology
|November 15, 2019
PubMed
Summary
This summary is machine-generated.

We present a versatile method for modeling messenger RNA (mRNA) translation using the totally asymmetric simple exclusion process (TASEP). This approach reveals ribosome interference and supports the ramp hypothesis, challenging initiation-limited views of translation.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Molecular Biology

Background:

  • Messenger RNA (mRNA) translation is a fundamental biological process.
  • Current models often simplify translation dynamics, potentially overlooking key regulatory mechanisms.

Purpose of the Study:

  • To develop and validate a versatile computational method for modeling mRNA translation.
  • To investigate realistic translation scenarios, including codon-dependent rates, ribosome drop-off, and reinitiation.
  • To challenge the prevailing view of translation being solely rate-limited by initiation.

Main Methods:

  • Development of a novel mathematical method based on the totally asymmetric simple exclusion process (TASEP).
  • Incorporation of realistic features into the TASEP model: codon-dependent elongation rates, premature termination (ribosome drop-off), and translation reinitiation.
  • Application and validation of the method using data from Saccharomyces cerevisiae under physiological conditions.
  • Comparison of model predictions with results from stochastic simulations.

Main Results:

  • The developed TASEP-based method accurately reproduces results from stochastic simulations for yeast translation.
  • The model provides theoretical evidence for ribosome interference during translation.
  • Findings support the ramp hypothesis, suggesting slower initial codon elongation rates to prevent ribosome jamming.

Conclusions:

  • The TASEP-based modeling approach is versatile and applicable to complex, realistic mRNA translation scenarios.
  • The study challenges the oversimplified view that translation is primarily limited by initiation.
  • Ribosome interference and the ramp hypothesis are supported as important factors in translation regulation.