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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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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
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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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Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
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Binding of SARS-CoV-2 Nonstructural Protein 1 to 40S Ribosome Inhibits mRNA Translation.

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SARS-CoV-2 NSP1 enhances mRNA binding to the 40S ribosome, inhibiting translation. Molecular dynamics simulations reveal electrostatic interactions and water molecules are key to this process, pinpointing NSP1 residues involved in translation arrest.

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Area of Science:

  • Molecular Biology
  • Virology
  • Biophysics

Background:

  • Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) non-structural protein 1 (NSP1) is known to inhibit host gene expression.
  • The precise molecular mechanisms by which NSP1 restricts mRNA translation at the 40S ribosomal subunit remain unclear.

Purpose of the Study:

  • To elucidate the molecular mechanisms of SARS-CoV-2 NSP1-mediated translation inhibition.
  • To investigate the role of NSP1 in mRNA binding affinity to the 40S ribosome.

Main Methods:

  • All-atom steered molecular dynamics simulations.
  • Coarse-grained alchemical simulations.
  • Analysis of mRNA-ribosome binding affinity in the presence and absence of NSP1.

Main Results:

  • SARS-CoV-2 NSP1 significantly enhances mRNA binding affinity to the 40S ribosome.
  • Electrostatic interactions between mRNA and the 40S ribosome are identified as the primary drivers of translation.
  • Water molecules play a crucial role in stabilizing the mRNA-40S ribosome complex.
  • Specific NSP1 residues responsible for translation arrest were identified.

Conclusions:

  • SARS-CoV-2 NSP1 inhibits mRNA translation by increasing mRNA binding to the 40S ribosome.
  • The findings provide molecular insights into viral-induced host translation shutdown.
  • Understanding these interactions can inform therapeutic strategies against SARS-CoV-2.