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Related Concept Videos

Nuclear Protein Sorting01:34

Nuclear Protein Sorting

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Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
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Nuclear Export of mRNA02:31

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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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Eukaryotic RNA Polymerases00:58

Eukaryotic RNA Polymerases

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RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
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Regulation of Nuclear Protein Sorting01:45

Regulation of Nuclear Protein Sorting

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Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
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Nuclear Export01:42

Nuclear Export

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The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
NES are of three types- the canonical 10-residue long leucine-rich signal and other...
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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.
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
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Analysis of Spliceosomal snRNA Localization in Human Hela Cells Using Microinjection
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Nuclear sorting of short RNA polymerase II transcripts.

William Garland1, Torben Heick Jensen1

  • 1Department of Molecular Biology and Genetics, Aarhus University, Universitetsbyen 81, Aarhus, Denmark.

Molecular Cell
|October 4, 2024
PubMed
Summary

Mammalian genomes generate numerous short RNAs due to RNA polymerase II (RNAPII) activity and early termination. The arsenite resistance protein 2 (ARS2) helps sort these RNAs for proper function or degradation.

Keywords:
ARS2FLASHIntegratorNEXTPAXTPHAXRNA decayRNA sortingRestrictorpremature transcription termination

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Area of Science:

  • Molecular Biology
  • Genomics
  • RNA Biology

Background:

  • Mammalian genomes extensively produce short RNAs.
  • This production is linked to RNA polymerase II (RNAPII) activity and early transcription termination.
  • The fate of these RNAs (functional vs. non-functional) necessitates effective sorting mechanisms.

Purpose of the Study:

  • To discuss early RNA quality control (QC) mechanisms.
  • To explore how these QC pathways sort short RNAs.
  • To highlight the role of the arsenite resistance protein 2 (ARS2) in RNA processing.

Main Methods:

  • The study is a discussion and review of existing research.
  • It focuses on the molecular mechanisms of RNA processing and degradation.
  • It examines the assembly of RNA effectors at the 5' end of capped RNA.

Main Results:

  • Both destructive and productive RNA effectors associate with the 5' end of capped RNAs.
  • The arsenite resistance protein 2 (ARS2) is central to orchestrating these interactions.
  • Early QC mechanisms are crucial for determining the fate of newly synthesized RNAs.

Conclusions:

  • ARS2 plays a key role in the early sorting of short RNAs.
  • RNA processing pathways act as a quality control system to manage RNA abundance.
  • Understanding these mechanisms is vital for comprehending gene expression regulation.