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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.
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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.
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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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A nuclear import pathway exploited by pathogenic noncoding RNAs.

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Viroids, plant pathogens, utilize the cellular IMPORTIN ALPHA-4 (IMPa-4) pathway for nuclear import. A specific RNA structure, the C-loop, is crucial for this process and infectivity.

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Area of Science:

  • Molecular Biology
  • Plant Pathology
  • Cell Biology

Background:

  • Intracellular RNA trafficking typically involves nuclear export for function.
  • Emerging evidence shows functional RNAs can move from cytoplasm to nucleus, but mechanisms are unclear.
  • Viroids are plant-infecting circular noncoding RNAs.

Purpose of the Study:

  • To elucidate the mechanism of RNA nuclear import.
  • To investigate the role of cellular factors and RNA structures in viroid nuclear import.

Main Methods:

  • Utilized Nicotiana benthamiana and tomato (Solanum lycopersicum) as model systems.
  • Employed nuclear-replicating viroids to study RNA import pathways.
  • Investigated the involvement of IMPORTIN ALPHA-4 (IMPa-4) and viroid RNA-binding protein 1 (VIRP1).

Main Results:

  • Identified IMPORTIN ALPHA-4 (IMPa-4) as a key factor in viroid nuclear import.
  • Confirmed the role of viroid RNA-binding protein 1 (VIRP1) in binding both IMPa-4 and viroid RNA.
  • Demonstrated that a conserved C-loop in viroid RNA acts as a nuclear import signal, essential for VIRP1 binding, nuclear accumulation, and infectivity.
  • Found the C-loop motif in a satellite noncoding RNA dependent on VIRP1 for nuclear import.

Conclusions:

  • Viroid nuclear import involves the Importin-based cellular pathway, specifically IMPa-4.
  • The C-loop is a critical RNA signal for nuclear import, mediated by VIRP1.
  • These findings enhance understanding of subviral RNA infection and RNA nuclear import regulation.