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Related Concept Videos

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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Types of RNA01:23

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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

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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Regulation of Expression at Multiple Steps01:23

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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Ribosomal RNA Synthesis02:53

Ribosomal RNA Synthesis

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Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
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Regulation of Expression Occurs at Multiple Steps02:24

Regulation of Expression Occurs at Multiple Steps

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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
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Translational remodeling by RNA-binding proteins and noncoding RNAs.

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Cellular adaptation relies on translation reprogramming. RNA-binding proteins (RBPs) and noncoding RNAs (ncRNAs) coordinate protein synthesis during stress, acting as translatome remodelers.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Translation generates the proteome controlling cellular phenotype.
  • Adaptive translational reprogramming is crucial for cellular adaptation.
  • RNA-binding proteins (RBPs) and noncoding RNAs (ncRNAs) regulate mRNA stability and translation efficiency.

Purpose of the Study:

  • To explore the role of stress-activated RBP networks and ncRNAs in adaptive protein synthesis.
  • To highlight the post-transcriptional functions of long noncoding RNAs (lncRNAs).
  • To present a new paradigm of RNA-mediated regulation of protein output.

Main Methods:

  • Review of foundational studies on RBP-ncRNA interactions.
  • Analysis of recent conceptual innovations in translational control.
  • Integration of findings on lncRNAs, microRNAs, and RBP networks.

Main Results:

  • Stress-activated RBP networks and ncRNAs enhance translation efficiency of functionally related transcripts.
  • Long noncoding RNAs (lncRNAs) exhibit cell-type-specific, post-transcriptional regulatory functions.
  • Convergence of RBPs, lncRNAs, and microRNAs remodels the translatome for adaptive protein synthesis.

Conclusions:

  • RBPs, lncRNAs, and microRNAs act as "translatome remodelers."
  • The concept of "RNA operons" is revitalized by these findings.
  • This paradigm advances understanding of cellular stress adaptation and therapeutic strategies.