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Related Concept Videos

Riboswitches01:56

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: Riboswitches01:23

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...
tRNA Activation02:26

tRNA Activation

Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
tRNA Activation02:26

tRNA Activation

Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
Cooperative Binding of Transcription Regulators02:13

Cooperative Binding of Transcription Regulators

Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome.  Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...
Cooperative Binding of Transcription Regulators02:13

Cooperative Binding of Transcription Regulators

Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome.  Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...

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Related Experiment Video

Updated: May 9, 2026

Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses
11:19

Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses

Published on: February 25, 2011

Two-codon T-box riboswitch binding two tRNAs.

Nizar Y Saad1, Vassiliki Stamatopoulou, Mélanie Brayé

  • 1Unité Mixte de Recherche 7156 Génétique Moléculaire, Génomique, Microbiologie, Centre National de la Recherche Scientifique, Université de Strasbourg, 67084 Strasbourg, France.

Proceedings of the National Academy of Sciences of the United States of America
|July 17, 2013
PubMed
Summary
This summary is machine-generated.

T-box riboswitches can sense two different transfer RNAs (tRNAs) by utilizing overlapping codons in their specifier loop. This dual specificity allows for balanced amino acid biosynthesis, revealing a new layer of transcriptional regulation.

Keywords:
antiterminationmetabolic networkstRNA specificity

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Last Updated: May 9, 2026

Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses
11:19

Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses

Published on: February 25, 2011

Nanomanipulation of Single RNA Molecules by Optical Tweezers
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Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs
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Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs

Published on: May 10, 2018

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • T-box riboswitches regulate gene transcription via tRNA binding and terminator/antiterminator structure formation.
  • Previously, T-boxes were considered single-specific, binding only one tRNA anticodon through their specifier loop (SL).

Purpose of the Study:

  • To investigate the specificity of a T-box riboswitch in Clostridium acetobutylicum that regulates an essential tRNA-dependent transamidation pathway.
  • To determine if this T-box exhibits dual specificity due to overlapping codons in its SL for tRNA(Asn) and tRNA(Glu).

Main Methods:

  • Extensive mutagenic analyses
  • Biochemical assays
  • Chemical probing experiments
  • Genomic comparisons

Main Results:

  • The T-box riboswitch demonstrated efficient binding of both tRNA(Asn) and tRNA(Glu) both in vitro and in vivo.
  • Dual specificity is achieved through a single base shift in the SL, enabling recognition of overlapping codons.
  • Genomic data suggest widespread occurrence of such flexible T-boxes in bacteria, with specificity linked to metabolic pathway interconnections.

Conclusions:

  • T-box riboswitches can exhibit dual specificity, sensing multiple tRNAs via overlapping codons in the SL.
  • This mechanism allows for balanced biosynthesis of multiple amino acids, representing a unique transcriptional regulation strategy.
  • The codon ambiguity of SLs is genome-dependent, highlighting metabolic context in riboswitch evolution.