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Related Concept Videos

Riboswitches01:56

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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Transcriptional Regulation: Riboswitches01:23

Transcriptional Regulation: Riboswitches

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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 RNA01:23

Types of RNA

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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...
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Types of RNA01:20

Types of RNA

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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.
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Stringent Response in E. coli01:23

Stringent Response in E. coli

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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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Translational Regulation01:29

Translational Regulation

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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,...
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Nanomanipulation of Single RNA Molecules by Optical Tweezers
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Guanidine throws the riboswitch.

Alexandra A Mushegian1

  • 1Science Signaling, AAAS, Washington, DC 20005, USA.

Science Signaling
|February 2, 2017
PubMed
Summary
This summary is machine-generated.

This study reveals that a bacterial riboswitch can detect guanidine produced within the cell. This finding is crucial for understanding bacterial metabolic regulation and response mechanisms.

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Area of Science:

  • Bacterial molecular biology
  • Gene regulation
  • Metabolic sensing

Background:

  • Riboswitches are regulatory elements in mRNA that control gene expression.
  • Bacterial metabolism involves complex pathways for nutrient utilization and waste product management.

Purpose of the Study:

  • To investigate the sensing capabilities of a specific bacterial riboswitch.
  • To determine if this riboswitch responds to intracellularly generated molecules.

Main Methods:

  • In vitro transcription and translation assays.
  • Site-directed mutagenesis to probe riboswitch function.
  • Guanidine concentration measurements in bacterial cultures.

Main Results:

  • The bacterial riboswitch demonstrated specific binding to guanidine.
  • Gene expression was modulated by the riboswitch in response to varying guanidine levels.
  • Endogenous guanidine production was confirmed to activate the riboswitch.

Conclusions:

  • Bacterial riboswitches can function as sensors for endogenously produced metabolites like guanidine.
  • This provides a novel mechanism for bacteria to regulate gene expression based on internal metabolic status.