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Translational Regulation

Translational Regulation

Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...

Regulation of Expression Occurs at Multiple Steps

Regulation of Expression Occurs at Multiple Steps

Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...

Regulation of Expression at Multiple Steps

Regulation of Expression at Multiple Steps

The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...

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 stands for...

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 Life

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 Life

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Related Experiment Video

Updated: Jun 24, 2026

Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs

Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs

Published on: May 10, 2018

Translational control from head to tail.

Rachel Groppo¹, Joel D Richter

¹Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA 01605, United States.

Current Opinion in Cell Biology

|March 17, 2009

Summary

Messenger RNA (mRNA) translation is tightly regulated at initiation, elongation, and termination steps. Protein 4E-HP disrupts initiation, while altered elongation and premature termination impact protein production, affecting development and disease.

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Last Updated: Jun 24, 2026

Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs

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Published on: May 10, 2018

In vivo Interrogation of Central Nervous System Translatome by Polyribosome Fractionation

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Xenopus laevis as a Model to Identify Translation Impairment

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Published on: September 27, 2015

Area of Science:

Molecular Biology
Genetics
Biochemistry

Background:

mRNA translation is a fundamental biological process crucial for protein synthesis.
Translation is regulated at initiation, elongation, and termination stages, controlling protein output.
Aberrant translational control is implicated in various diseases, including cancer and neurological disorders.

Purpose of the Study:

To investigate the regulatory mechanisms of mRNA translation.
To explore the role of protein 4E-HP in translation initiation.
To understand how altered elongation and termination impact gene expression.

Main Methods:

Analysis of protein-RNA interactions.
Biochemical assays to study translation complex assembly.
Investigating mRNA fate under varying cellular conditions.

Main Results:

Protein 4E-HP directly binds the 5' cap of mRNAs, inhibiting translation initiation.
Evidence suggests altered mRNA elongation rates during mitosis and synaptic transmission.
Premature termination of non-stop mRNAs was observed to repress translation.

Conclusions:

Translational control is a key regulatory mechanism in diverse biological processes.
Dysregulation of translation initiation, elongation, or termination can have significant physiological consequences.
Understanding these mechanisms is vital for comprehending development, cancer, and synaptic plasticity.