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Related Concept Videos

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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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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Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

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Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
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RNA Interference01:23

RNA Interference

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RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
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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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Mechanisms by Which Small RNAs Affect Bacterial Activity.

L Lei1, Y Yang1,2, Y Yang1

  • 1State Key Laboratory of Oral Diseases, Department of Preventive Dentistry, West China Hospital of Stomatology, Sichuan University, Chengdu, China.

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Bacterial small RNAs (sRNAs) regulate oral pathogens, impacting biofilm formation and virulence. These regulatory RNAs offer potential biomarkers and drug targets for oral diseases.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • The oral cavity harbors diverse bacteria, with small RNAs (sRNAs) emerging as crucial regulators of bacterial physiology and pathogenesis.
  • sRNAs are categorized into five groups: cis-encoded RNAs, trans-encoded RNAs, RNA regulators of protein activity, bacterial CRISPR RNAs, and miRNA-size small RNAs (msRNAs).

Purpose of the Study:

  • This review discusses the roles of bacterial sRNAs in key oral commensal and opportunistic pathogens.
  • It highlights their function in regulating cellular processes, stress responses, and adaptation to environmental changes.

Main Methods:

  • The review synthesizes current research on bacterial sRNAs in oral pathogens.
  • It examines specific examples like *Streptococcus mutans*, *Enterococcus faecalis*, *Porphyromonas gingivalis*, and *Aggregatibacter actinomycetemcomitans*.

Main Results:

  • Supragingival sRNAs synergistically regulate adaptation and stress responses.
  • In *S. mutans*, sRNAs impede exopolysaccharide metabolism, biofilm formation, and cariogenicity.
  • Subgingival sRNAs act as signaling molecules in periodontal homeostasis and interact with virulence genes in pathogens like *P. gingivalis* and *A. actinomycetemcomitans*.

Conclusions:

  • Bacterial sRNAs are critical regulators in oral pathogens, influencing virulence and host interactions.
  • These sRNAs represent potential biomarkers for oral disease monitoring and novel targets for drug development.
  • The study of bacterial regulatory RNAs is reshaping our understanding of gene regulation in oral pathobiology.