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Related Concept Videos

Initiation of Translation02:33

Initiation of Translation

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...
Initiation of Translation02:33

Initiation of Translation

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...
Transcription Initiation01:47

Transcription Initiation

Initiation is the first step of transcription in eukaryotes. Prokaryotic RNA Polymerase (RNAP) can bind to the template DNA and start transcribing. On the other hand, transcription in eukaryotes requires additional proteins, called transcription factors, to first bind to the promoter region in the DNA template. This binding helps recruit the specific RNAP that can assemble on the DNA and start transcription.
The promoters and enhancers and their accessory proteins allow tight regulation of...
Leaky Scanning02:28

Leaky Scanning

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 stands for...
Translation in Prokaryotes01:29

Translation in Prokaryotes

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...
Improving Translational Accuracy02:07

Improving Translational Accuracy

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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Related Experiment Video

Updated: Jun 21, 2026

Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs
10:37

Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs

Published on: May 10, 2018

Begin at the beginning: evolution of translational initiation.

Dario Benelli1, Paola Londei

  • 1Dipartimento di Biotecnologie Cellulari ed Ematologia, Università di Roma Sapienza, Policlinico Umberto I, Viale Regina Elena 324, 00161 Roma, Italy.

Research in Microbiology
|July 7, 2009
PubMed
Summary

Protein synthesis initiation ensures accurate translation by setting the correct reading frame. This vital process, conserved across Bacteria, Archaea, and Eukarya, likely existed in the last universal common ancestor.

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Last Updated: Jun 21, 2026

Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs
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Published on: May 10, 2018

An In Vitro Single-Molecule Imaging Assay for the Analysis of Cap-Dependent Translation Kinetics
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An In Vitro Single-Molecule Imaging Assay for the Analysis of Cap-Dependent Translation Kinetics

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Area of Science:

  • Molecular Biology
  • Genetics
  • Evolutionary Biology

Background:

  • Protein synthesis initiation is the rate-limiting step in translation.
  • Accurate start codon recognition and reading frame setting are crucial for cellular survival.
  • Translation regulation primarily targets the initiation step.

Purpose of the Study:

  • To review the molecular machinery of translation initiation in Bacteria, Archaea, and Eukarya.
  • To identify conserved features of initiation across the primary domains of life.
  • To reconstruct a model of the ancestral translation initiation apparatus.

Main Methods:

  • Literature review of known features of translation initiation machinery.
  • Comparative analysis of initiation mechanisms across different life domains.
  • Identification of conserved elements potentially inherited from the last universal common ancestor.

Main Results:

  • Initiation of protein synthesis is a highly regulated and conserved process.
  • Key features of the initiation machinery show conservation across Bacteria, Archaea, and Eukarya.
  • These conserved features suggest an ancient origin for the core initiation mechanism.

Conclusions:

  • The fundamental mechanism for translation initiation likely predates the divergence of modern life domains.
  • Understanding conserved initiation features aids in reconstructing the ancestral translation apparatus.
  • This conserved machinery is vital for the survival and function of all extant cells.