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Initiation of Translation

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...

Translation in Prokaryotes

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...

Termination of Translation

Termination of Translation

The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...

Translation

Translation

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.
Translation Produces the Building Blocks of...

Leaky Scanning

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...

Improving Translational Accuracy

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: Sep 30, 2025

Analysis of Translation Initiation During Stress Conditions by Polysome Profiling

Analysis of Translation Initiation During Stress Conditions by Polysome Profiling

Published on: May 19, 2014

The Structural Dynamics of Translation.

Andrei A Korostelev¹

¹RNA Therapeutics Institute, University of Massachusetts Chan Medical School, Worcester, Massachusetts, USA;

Annual Review of Biochemistry

|March 15, 2022

Summary

Translation factors ensure accurate protein synthesis by guiding ribosome dynamics. Recent cryo-electron microscopy (cryo-EM) reveals how these factors monitor ribosome conformations during translation initiation, elongation, and termination.

Keywords:

RNA dynamics cryo-EM ribosome translation elongation translation initiation translation termination

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Last Updated: Sep 30, 2025

Analysis of Translation Initiation During Stress Conditions by Polysome Profiling

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Published on: May 19, 2014

Optical Tweezers to Study RNA-Protein Interactions in Translation Regulation

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Published on: February 12, 2022

Xenopus laevis as a Model to Identify Translation Impairment

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Published on: September 27, 2015

Area of Science:

Molecular Biology
Structural Biology
Biochemistry

Background:

Accurate protein synthesis (translation) is crucial for cellular function.
Translation factors are essential for rectifying ribosome fluctuations during protein synthesis.
Previous structural studies provided initial insights into ribosome-factor complexes.

Purpose of the Study:

To review recent advances in understanding translation factor mechanisms.
To highlight the role of structural biology, particularly cryo-EM, in visualizing translation dynamics.
To explain how translation factors ensure accuracy and efficiency by interacting with ribosome conformations.

Main Methods:

Single-particle cryogenic electron microscopy (cryo-EM) for near-atomic resolution structures.
Analysis of heterogeneous complexes (ensembles) to capture dynamic states.
Time-resolved cryo-EM to visualize transitions during translation stages.

Main Results:

Cryo-EM has provided unprecedented views of ribosome transitions during initiation, elongation, and termination.
Ensemble analysis reveals diverse structures within heterogeneous complexes.
Detailed structures illustrate how factors interact with distinct ribosome conformations.

Conclusions:

Translation factors are key to achieving high accuracy and efficiency in protein synthesis.
Factors achieve this by monitoring specific ribosome conformations.
Factors differentially shift equilibrium of ribosome rearrangements for cognate and near-cognate substrates.