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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,...

Transcription Attenuation in Prokaryotes

Transcription Attenuation in Prokaryotes

Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure. Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...

Stringent Response in E. coli

Stringent Response in E. coli

Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...

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Related Experiment Video

Updated: Jun 10, 2026

In vivo Application of the REMOTE-control System for the Manipulation of Endogenous Gene Expression

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Published on: March 29, 2019

Tracking, tuning, and terminating microbial physiology using synthetic riboregulators.

Jarred M Callura¹, Daniel J Dwyer, Farren J Isaacs

¹Howard Hughes Medical Institute, Boston University, MA 02215, USA.

Proceedings of the National Academy of Sciences of the United States of America

|August 18, 2010

Summary

Synthetic biology advances with a new RNA-based system for precise gene control. This adaptable tool enables modular, tunable gene expression, ideal for microbiology and biotechnology applications.

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Area of Science:

Synthetic biology
Molecular biology
Biotechnology

Background:

Synthetic biology aims to create biomolecular devices for novel functions.
Previous work established a synthetic riboregulator for gene expression control in vivo.

Purpose of the Study:

To highlight the experimental advantages of an RNA-based synthetic riboregulator system.
To demonstrate the system's utility in various microbial experiments and applications.

Main Methods:

Utilized a synthetic riboregulator system for in vivo gene expression control.
Conducted experiments in microbial systems, including GFP fusion protein tracking and toxic protein regulation.
Applied the system for perturbation of stress response networks and logic-based computing.

Main Results:

The RNA-based system offers modularity, tunability, and minimal leakage.
Demonstrated physiologically relevant protein production and rapid response times.
Successfully implemented the system for tracking, toxic gene regulation, stress response studies, and bacterial kill switch development.

Conclusions:

The synthetic riboregulator provides a broad, user-friendly platform for synthetic biology.
This system enhances microbiology experiments and biotechnology applications.
The platform enables precise control and programmability of gene expression.