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Initiation of Translation02:33

Initiation of Translation

38.2K
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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Initiation of Translation02:33

Initiation of Translation

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7.8K
Translation in Prokaryotes01:29

Translation in Prokaryotes

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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...
1.3K
Improving Translational Accuracy02:07

Improving Translational Accuracy

14.0K
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...
14.0K
Leaky Scanning02:28

Leaky Scanning

5.6K
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...
5.6K
General Transcription Factors01:30

General Transcription Factors

6.6K
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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Related Experiment Video

Updated: Jan 8, 2026

Monitoring eIF4F Assembly by Measuring eIF4E-eIF4G Interaction in Live Cells
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Monitoring eIF4F Assembly by Measuring eIF4E-eIF4G Interaction in Live Cells

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Eukaryotic translation initiation factor 4F: functional properties and physiological role.

Ekaterina Shuvalova1, Walaa Al Sheikh1,2, Alexey Shuvalov1

  • 1Engelhardt Institute of Molecular Biology, the Russian Academy of Sciences, Moscow, 119991, Russia.

Nucleic Acids Research
|December 17, 2025
PubMed
Summary
This summary is machine-generated.

The eukaryotic initiation factor 4F (eIF4F) complex is crucial for protein translation initiation. This review explores eIF4F

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Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • Translation initiation is a highly regulated process.
  • The eukaryotic initiation factor 4F (eIF4F) complex plays a key role in this regulation.
  • eIF4F consists of eIF4E, eIF4A, and eIF4G subunits.

Purpose of the Study:

  • To review the roles of eIF4F in translation.
  • To discuss its regulatory functions in various cellular conditions.
  • To highlight unresolved questions regarding its mechanistic contributions.

Main Methods:

  • Literature review of existing studies on eIF4F.
  • Analysis of eIF4F's structure and function.
  • Examination of eIF4F's involvement in cellular regulation.

Main Results:

  • eIF4F is central to the tightly regulated initiation of translation.
  • Dysregulation of eIF4F is linked to numerous physiological abnormalities.
  • Recent research positions eIF4F as a global cellular regulator.

Conclusions:

  • eIF4F is critical for cellular function and translational control.
  • Further research is needed to fully understand eIF4F's mechanistic roles.
  • eIF4F's function extends beyond translation initiation, impacting global cellular regulation.