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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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The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
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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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Stringent Nucleotide Recognition by the Ribosome at the Middle Codon Position.

Wei Liu1, Dongwon Shin2, Martin Ng3

  • 1Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104, USA. weiliu@sas.upenn.edu.

Molecules (Basel, Switzerland)
|August 30, 2017
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Summary

This study reveals tighter constraints on codon:anticodon base pairing at the middle position during protein synthesis. It suggests a sequential formation mechanism for the codon:anticodon helix, crucial for genetic code translation.

Keywords:
atomic mutagenesisfluorescent mRNAkinetic mechanismmRNA:tRNA base pairingsteric constraint

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Accurate translation of the genetic code relies on messenger RNA (mRNA) and transfer RNA (tRNA) codon:anticodon base pairing.
  • Understanding the kinetics of this interaction is vital for elucidating protein synthesis fidelity.

Purpose of the Study:

  • To directly measure the kinetics of codon:anticodon base formation during protein synthesis.
  • To investigate the positional constraints and mechanism of codon:anticodon helix formation.

Main Methods:

  • Utilized an emissive, isosteric adenosine surrogate.
  • Employed direct kinetic measurements of base pair formation during protein synthesis.

Main Results:

  • Codon:anticodon base pairing exhibits stricter constraints at the central position compared to the 5' and 3' positions.
  • Evidence suggests a sequential mechanism for the formation of the three base pairs within the codon:anticodon helix.

Conclusions:

  • The central position of the codon:anticodon interaction is critical for maintaining accuracy in genetic code translation.
  • The sequential formation model provides new insights into the dynamics of protein synthesis.