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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...

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...

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...

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,...

Coordination of Gene Expression Processes in Bacteria

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The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...

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Updated: Jun 18, 2026

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues

Published on: February 19, 2019

A bacterial pathogen flips the riboswitch.

Bobbi Xayarath¹, Nancy E Freitag

¹Department of Microbiology and Immunology, University of Illinois at Chicago, Chicago, IL 60612-7344, USA.

Cell Host & Microbe

|November 18, 2009

Summary

This summary is machine-generated.

Riboswitches, RNA molecules regulating gene expression, can now be understood to function in trans. This study demonstrates a riboswitch modulating a bacterial virulence regulator, expanding their known regulatory roles.

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Published on: August 20, 2014

Area of Science:

Bacterial genetics
RNA biology
Gene regulation

Background:

Riboswitches are RNA elements that control gene expression.
Traditionally, riboswitches are known to function in cis, regulating their own downstream genes.
The precise mechanisms and scope of riboswitch regulatory functions are still being elucidated.

Purpose of the Study:

To investigate the potential for riboswitches to act in trans.
To determine if a riboswitch can modulate the expression of a separate genetic target.
To explore the role of riboswitches in regulating bacterial virulence factors.

Main Methods:

Utilized genetic and molecular biology techniques to study riboswitch function.
Designed experiments to assess riboswitch activity on a non-linked gene.
Focused on a specific bacterial virulence regulator as the target.

Main Results:

Demonstrated that a riboswitch can indeed function in trans.
Showed modulation of a critical bacterial virulence regulator by a trans-acting riboswitch.
Provided evidence for a novel mode of gene regulation in bacteria.

Conclusions:

Riboswitches possess a broader regulatory capacity than previously recognized.
Trans-acting riboswitches offer new avenues for understanding and manipulating bacterial gene expression.
This finding has implications for controlling bacterial virulence and developing novel antimicrobial strategies.