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Riboswitches

Riboswitches

Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...

Transcriptional Regulation: Riboswitches

Transcriptional Regulation: Riboswitches

Riboswitches are RNA elements that regulate gene expression by altering their secondary structures in response to specific effector molecules. These elements, located in the leader regions of certain mRNAs, act as transcriptional regulators by toggling between alternative conformations to control downstream gene expression. Riboswitch-mediated regulation is a precise mechanism for modulating biosynthetic pathways, as exemplified by the riboflavin biosynthesis pathway in Bacillus...

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,...

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...

Ribosome Profiling

Ribosome Profiling

Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
The technique helps...

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...

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Related Experiment Video

Updated: Jun 23, 2026

MS2-Affinity Purification Coupled with RNA Sequencing in Gram-Positive Bacteria

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Predicting riboswitch regulation on a genomic scale.

Jeffrey E Barrick¹

¹Michigan State University, East Lansing, MI 48824-4320, USA. jbarrick@msu.edu

Methods in Molecular Biology (Clifton, N.J.)

|April 22, 2009

Summary

This study introduces a method to identify novel riboswitches using genomic sequence analysis. These findings aid in understanding gene regulation and protein function across species.

Area of Science:

Genomics
RNA Biology
Bioinformatics

Background:

Riboswitches are crucial genetic regulatory elements found in various genomes.
Identifying novel riboswitches is essential for understanding gene expression control.

Purpose of the Study:

To develop and validate a method for large-scale riboswitch identification using genomic sequence data.
To enhance the annotation of riboswitches and their associated functions.

Main Methods:

Utilized covariance model searches to detect characteristic riboswitch aptamer domain architectures.
Analyzed genomic contexts of potential riboswitches to assess biological relevance.
Integrated comparative genomic support for accurate sequence-based identification.

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Main Results:

Successfully identified new riboswitch examples through computational analysis.
Demonstrated the efficacy of combining structural and genomic context data for riboswitch discovery.
Enabled more precise functional assignments for regulated proteins.

Conclusions:

Genomic-scale annotation of riboswitches is feasible and highly informative.
This approach improves the definition of conserved RNA structures and identifies divergent variants.
Provides insights into the evolutionary variation of genetic regulation in metabolic processes.