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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,...

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...

Types of RNA

Types of RNA

Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA Performs Diverse...

Types of RNA

Types of RNA

Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...

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...

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...

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Related Experiment Video

Updated: Jun 25, 2026

Monitoring Protein-RNA Interaction Dynamics In Vivo at High Temporal Resolution Using χCRAC

Monitoring Protein-RNA Interaction Dynamics In Vivo at High Temporal Resolution Using χCRAC

Published on: May 9, 2020

Translational activation: An unforeseen function of RNP biomolecular condensates.

Ali Haidar¹, Anne Ramat¹, Martine Simonelig¹

¹Institute of Human Genetics, University of Montpellier, CNRS, Montpellier, France.

|June 23, 2026

Summary

This summary is machine-generated.

RNA-protein (RNP) condensates organize cell biochemistry and gene expression. Recent advances reveal their dual role in mRNA translation, impacting RNA biology and therapeutics.

Keywords:

Suntag biomolecular condensates biophysical properties germ granules mRNA storage multiphasic condensates stress granules translation translational repression

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Last Updated: Jun 25, 2026

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Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

Biomolecular condensates are key cellular structures.
RNA-protein (RNP) condensates are crucial for gene expression.
Their role in biological processes is under investigation.

Purpose of the Study:

Review current knowledge on cytoplasmic RNP condensate functions in mRNA regulation.
Highlight advances in understanding RNP condensates' role in mRNA translation.
Discuss mechanisms reconciling dual functions in translational repression and activation.

Main Methods:

Literature review of current research on RNP condensates.
Analysis of technological and conceptual advances in RNA biology.
Exploration of biophysical principles governing RNP condensate function.

Main Results:

RNP condensates have an unexpected function in mRNA translation.
Mechanisms exist for RNP condensates to both repress and activate translation.
Biophysical properties dictate condensate function and compartmentalization.

Conclusions:

Cytoplasmic RNP condensates play a significant role in mRNA translation.
Understanding condensate biophysics is key to their functional compartmentalization.
This function offers potential for improved RNA-based therapeutics.