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Related Concept Videos

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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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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Riboswitches01:56

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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.
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Types of RNA01:23

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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 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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Types of RNA01:20

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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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Ribozymes02:47

Ribozymes

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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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Structure-Activity Relationship of Flavin Analogues That Target the Flavin Mononucleotide Riboswitch.

Quentin Vicens1, Estefanía Mondragón1, Francis E Reyes1

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Researchers developed a structure-guided strategy to design novel RNA-targeting antibiotics. This approach led to a flavin mononucleotide (FMN) derivative effective against Clostridium difficile, offering a new avenue for antibacterial drug discovery.

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Area of Science:

  • Microbiology
  • Drug Discovery
  • Structural Biology

Background:

  • The flavin mononucleotide (FMN) riboswitch is a promising target for novel RNA-targeting antibiotics.
  • A previously discovered FMN derivative, 5FDQD, demonstrated efficacy in protecting mice against Clostridium difficile.

Purpose of the Study:

  • To present a structure-based drug design strategy for developing FMN riboswitch-targeting antibacterial agents.
  • To discover and characterize novel fluoro-phenyl derivatives with antibacterial properties.

Main Methods:

  • Comprehensive structural analysis of FMN riboswitch structures.
  • Design, synthesis, and purification of FMN derivatives.
  • In vitro binding assays (chemical probing) and transcription termination assays.
  • Resolution of crystal structures of FMN riboswitch-antibiotic complexes.

Main Results:

  • Delineation of key principles for productive binding to the FMN riboswitch.
  • Identification of a fluoro-phenyl derivative with antibacterial activity.
  • Validation of a structure-guided approach for RNA-targeting drug design.

Conclusions:

  • A coordinated structure-guided strategy is effective for designing drugs targeting RNA.
  • This approach yielded a promising FMN derivative for combating Clostridium difficile infections.
  • The study provides a framework for developing future RNA-targeting antibiotics.