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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.
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Transcriptional Regulation: Riboswitches01:23

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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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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 Regulation01:29

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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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Ribosome Profiling02:24

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Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Exploring intermolecular interactions of a substrate binding protein using a riboswitch-based sensor.

Casey C Fowler1, Seiji Sugiman-Marangos1, Murray S Junop1

  • 1Department of Biochemistry and Biomedical Sciences, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4K1, Canada.

Chemistry & Biology
|December 3, 2013
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Summary
This summary is machine-generated.

Researchers developed a novel riboswitch sensor to track biological transporter activity in bacteria. This method monitored vitamin B12 uptake by the ABC transporter BtuC2D2F in E. coli, revealing key molecular interactions.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Studying biological transporter activity within cells is challenging due to limited methodologies.
  • Efficient transport systems are crucial for cellular functions, including nutrient uptake.

Purpose of the Study:

  • To develop a novel method for monitoring biological transporter function in bacteria.
  • To investigate the functional importance of specific residues in the BtuF substrate-binding protein of the BtuC2D2F transporter.

Main Methods:

  • Utilized a genetically encoded riboswitch-based sensor to detect cytoplasmic substrate accumulation.
  • Applied the sensor to study the model ABC transporter BtuC2D2F in Escherichia coli.
  • Leveraged existing structural data to analyze key residues in the BtuF protein.

Main Results:

  • Successfully monitored the activity of the BtuC2D2F transporter using the riboswitch sensor.
  • Identified molecular interaction requirements for substrate binding proteins.
  • Probed the functional significance of residues in BtuF interacting with substrate and BtuC subunits.

Conclusions:

  • Riboswitch-based sensors are effective tools for studying biological transport mechanisms.
  • The study elucidated critical molecular interactions within the BtuC2D2F vitamin B12 transporter.
  • This methodology advances the study of transporter function in microbial systems.