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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.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
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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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Translation01:31

Translation

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Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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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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Xenopus laevis as a Model to Identify Translation Impairment
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Single nucleotide translation without ribosomes.

Biswarup Jash1, Peter Tremmel1, Dejana Jovanovic1

  • 1Institute of Organic Chemistry, University of Stuttgart, Stuttgart, Germany.

Nature Chemistry
|July 27, 2021
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Summary
This summary is machine-generated.

Researchers show a primitive form of translation using single nucleotides and amino acids. This RNA-templated process, occurring in dilute solutions, suggests a simpler origin for protein synthesis.

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Area of Science:

  • Origin of life studies
  • Biochemistry
  • Molecular evolution

Background:

  • The central dogma of molecular biology describes mRNA translation into polypeptides via ribosomes.
  • The evolutionary origins of this complex process from simpler precursors remain largely unknown.

Purpose of the Study:

  • To investigate a potential prebiotic mechanism for RNA-templated amino acid polymerization.
  • To demonstrate a simplified translation system operating under plausible early Earth conditions.

Main Methods:

  • Experiments were conducted in dilute aqueous solution at 0°C.
  • Amino acid-charged nucleotides were reacted with an RNA primer.
  • Reactions were directed by an RNA template sequence.
  • Competition assays with different amino acid-nucleotide combinations were performed.

Main Results:

  • Single amino acid-charged nucleotides coupled with amino acids at the 5'-terminus of an RNA primer.
  • RNA template nucleotides directed the sequence of dipeptide formation via base pairing.
  • Dipeptides could be retained for further extension or released under mild acidic conditions.

Conclusions:

  • A single-nucleotide-based translation system, requiring only oligonucleotides and anchored amino acids, has been demonstrated.
  • This finding provides a plausible model for the early evolution of translation.
  • The system highlights the potential for RNA to direct both genetic information and early peptide synthesis.