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MicroRNAs01:22

MicroRNAs

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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After...
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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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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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Nucleic Acid Structure01:25

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The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
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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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microRNA-binding proteins: specificity and function.

Richard W Zealy1, Samuel P Wrenn1, Sylvia Davila1

  • 1Department of Biochemistry and Molecular Biology, College of Medicine, Medical University of South Carolina, Charleston, SC, USA.

Wiley Interdisciplinary Reviews. RNA
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Summary
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RNA-binding proteins (RBPs) and microRNAs (miRNAs) regulate gene expression. Novel miRNA-binding proteins (miRBPs) interact with AGO-free miRNAs, revealing new insights into miRNA-mediated gene silencing.

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Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Biochemistry

Background:

  • MicroRNAs (miRNAs) and RNA-binding proteins (RBPs) are key regulators of post-transcriptional gene expression.
  • Research has elucidated how miRNAs and RBPs modulate mRNA decay and translation, and their interplay.
  • Emerging evidence shows direct interactions between RBPs and mature miRNAs beyond AGO-family proteins.

Purpose of the Study:

  • To review recent discoveries of novel miRNA-binding proteins (miRBPs).
  • To provide a new perspective on miRNA-mediated gene silencing mechanisms.
  • To highlight the emerging role of AGO-free cytoplasmic miRNAs complexing with miRBPs.

Main Methods:

  • Literature review of recent studies on miRNA-RBP interactions.
  • Analysis of emerging findings on novel miRBPs.
  • Synthesis of current knowledge on miRNA-mediated gene silencing pathways.

Main Results:

  • Certain RBPs directly interact with mature miRNAs, influencing miRNA-AGO association.
  • Mechanisms include competitive binding, miRNA sequestration from AGO, promotion of AGO binding, and miRNA transfer.
  • AGO-free cytoplasmic miRNAs form complexes with novel miRBPs, expanding the known regulatory network.

Conclusions:

  • Novel miRBPs represent a significant addition to the understanding of miRNA function.
  • These interactions offer new perspectives on the complexity of miRNA-mediated gene silencing.
  • The discovery of AGO-free miRNA complexes broadens the scope of post-transcriptional regulation.