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Related Concept Videos

Regulation of Nuclear Protein Sorting01:45

Regulation of Nuclear Protein Sorting

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...
Directionality of Nuclear Transport01:42

Directionality of Nuclear Transport

Ras-related nuclear protein or Ran is a small G protein that cycles between its GTP and GDP bound states. Ran specific regulators, a Ran GTPase Activating Protein or RanGAP present in the cytosol and a Ran guanine nucleotide exchange factor or RanGEF present inside the nucleus regulate GTP/GDP exchange. A high concentration of GTP inside the cells, in addition to this asymmetric distribution of  Ran-specific regulators, leads to a higher RanGTP concentration inside the nucleus. This...
Nuclear Protein Sorting01:34

Nuclear Protein Sorting

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...
Nuclear Export01:42

Nuclear Export

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...
Nuclear Localization Signals and Import01:46

Nuclear Localization Signals and Import

Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of  2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...
Nuclear Export of mRNA02:31

Nuclear Export of mRNA

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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Related Experiment Video

Updated: Jun 23, 2026

Assay to Measure Nucleocytoplasmic Transport in Real Time within Motor Neuron-like NSC-34 Cells
08:53

Assay to Measure Nucleocytoplasmic Transport in Real Time within Motor Neuron-like NSC-34 Cells

Published on: May 16, 2017

Nuclear transport factors in neuronal function.

Rotem Ben-Tov Perry1, Mike Fainzilber

  • 1Dept. of Biological Chemistry, Weizmann Institute of Science, Rehovot, Israel.

Seminars in Cell & Developmental Biology
|May 5, 2009
PubMed
Summary
This summary is machine-generated.

Importins (karyopherins) are crucial for nuclear transport in all cells. In neurons, they have specialized roles in differentiation, injury response, and signaling, with localized RNA regulation impacting their function.

Related Experiment Videos

Last Updated: Jun 23, 2026

Assay to Measure Nucleocytoplasmic Transport in Real Time within Motor Neuron-like NSC-34 Cells
08:53

Assay to Measure Nucleocytoplasmic Transport in Real Time within Motor Neuron-like NSC-34 Cells

Published on: May 16, 2017

Area of Science:

  • Cell Biology
  • Neuroscience

Background:

  • Nucleocytoplasmic transport relies on importin/karyopherin superfamily proteins.
  • Neurons face unique challenges requiring specialized importin mobilization.

Purpose of the Study:

  • To explore the specialized roles and regulation of importins in neurons.
  • To investigate the implications of neuronal importin functions for broader cellular biology and disease.

Main Methods:

  • Analysis of importin alpha subtype expression during neuronal differentiation.
  • Investigation of localized importin beta1 synthesis in axons.
  • Examination of RNA targeting for importin complex components in axons.

Main Results:

  • Neurons exhibit dynamic importin alpha subtype expression and localized importin beta1 synthesis for injury signaling.
  • Axonal RNA targeting enables local regulation of importin function.
  • Specific importin family members are linked to neurodegenerative and mental health disorders.

Conclusions:

  • Importins play multifaceted roles in neuronal function, including differentiation, injury response, and synaptic signaling.
  • Localized RNA regulation provides sophisticated control over neuronal importin activity.
  • Neuronal importin functions may offer insights into non-neuronal cellular processes and disease mechanisms.