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Riboswitches

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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...

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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...

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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.
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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,...

Ribozymes

Ribozymes

The term ribozyme is used for RNA that can act as an enzyme. Ribozymes are mainly found in selected viruses, bacteria, plant organelles, and lower eukaryotes. Ribozymes were first discovered in 1982 when Tom Cech’s laboratory observed Group I introns acting as enzymes. This was shortly followed by the discovery of another ribozyme, Ribonulcease P, by Sid Altman’s laboratory. Both Cech and Altman received the Nobel Prize in chemistry in 1989 for their work on ribozymes.
Ribozymes can be...

Ribozymes

Ribozymes

The term ribozyme is used for RNA that can act as an enzyme. Ribozymes are mainly found in selected viruses, bacteria, plant organelles, and lower eukaryotes. Ribozymes were first discovered in 1982 when Tom Cech’s laboratory observed Group I introns acting as enzymes. This was shortly followed by the discovery of another ribozyme, Ribonulcease P, by Sid Altman’s laboratory. Both Cech and Altman received the Nobel Prize in chemistry in 1989 for their work on ribozymes.
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Related Experiment Video

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Nanomanipulation of Single RNA Molecules by Optical Tweezers

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Engineering ligand-responsive gene-control elements: lessons learned from natural riboswitches.

K H Link¹, R R Breaker

¹Howard Hughes Medical Institute, Yale University, New Haven, CT, USA.

|July 10, 2009

Summary

This summary is machine-generated.

Researchers are engineering RNA molecules, like aptamers and ribozymes, to create precise gene-control systems. While progress is being made on designer riboswitches, further advances are needed for eukaryotic applications.

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Area of Science:

Molecular Biology
Synthetic Biology
Biotechnology

Background:

Recent advances in engineering aptamers and ribozymes have spurred interest in creating novel gene-control systems.
Natural riboswitches demonstrate RNA's capability to act as precise, ligand-sensing genetic switches.
Existing protein-based gene regulation systems serve as benchmarks for RNA-based systems.

Purpose of the Study:

To evaluate the potential of engineered RNAs for gene expression regulation.
To outline pathways for developing designer riboswitches using current technologies.
To identify technical advancements needed for routine production of eukaryotic-compatible designer riboswitches.

Main Methods:

Review of current technologies for engineering aptamers and ribozymes.
Analysis of natural riboswitches as models for genetic switches.
Evaluation of progress and challenges in designer riboswitch development.

Main Results:

Engineered RNAs show promise for specific small-molecule-responsive gene control.
Significant progress has been made, but RNA systems lag behind protein systems in performance.
Current technologies offer viable paths toward designer riboswitches.

Conclusions:

Engineered RNAs hold considerable potential for precise gene regulation.
Further technological advancements are crucial for matching protein system performance.
Facilitating the routine production of eukaryotic-functional designer riboswitches is a key future goal.