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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.
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Translation in Prokaryotes01:29

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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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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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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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Recent Advances in Archaeal Translation Initiation.

Emmanuelle Schmitt1, Pierre-Damien Coureux1, Ramy Kazan1

  • 1Laboratoire de Biologie Structurale de la Cellule, BIOC, Ecole Polytechnique, CNRS-UMR7654, Institut Polytechnique de Paris, Palaiseau, France.

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Summary

Translation initiation (TI) accurately selects start codons and reading frames. Archaea

Keywords:
Shine-DalgarnoevolutionleaderlessmRNAribosomal proteins

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Genomics

Background:

  • Translation initiation (TI) is crucial for protein synthesis, involving a complex of ribosomal subunits, mRNA, initiator tRNA, and initiation factors.
  • While general principles are conserved, TI mechanisms differ across bacteria, eukaryotes, and archaea, and can vary with mRNA structure.
  • Studying TI provides insights into evolutionary relationships and the evolution of molecular mechanisms.

Purpose of the Study:

  • To review archaeal translation initiation mechanisms.
  • To highlight the evolutionary connections between archaeal, bacterial, and eukaryotic TI.
  • To discuss the diversity of TI in archaeal lineages and its relationship with mRNA types.

Main Methods:

  • Review of recent structural data on ribosomal complexes.
  • Analysis of genome-wide studies.
  • Comparative analysis of TI mechanisms across different domains of life.

Main Results:

  • Archaea exhibit eukaryotic features in their small ribosomal subunits.
  • Diversity in TI mechanisms exists within archaeal branches.
  • Analysis of leaderless and leadered (Shine-Dalgarno) mRNAs in archaea reveals distinct TI strategies.

Conclusions:

  • Archaeal TI mechanisms show a mosaic of bacterial and eukaryotic features.
  • Understanding TI diversity in archaea sheds light on ribosome evolution.
  • The study of archaeal TI contributes to a broader understanding of molecular evolution.