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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...
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...
Transducer Mechanism: Nuclear Receptors01:31

Transducer Mechanism: Nuclear Receptors

Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
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...

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Video Experimental Relacionado

Updated: May 13, 2026

Single-Molecule Imaging of Nuclear Transport
12:13

Single-Molecule Imaging of Nuclear Transport

Published on: June 9, 2010

Posicionamiento nuclear de posicionamiento.

Gregg G Gundersen1, Howard J Worman

  • 1Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA. ggg1@columbia.edu

Cell
|March 19, 2013
PubMed
Resumen
Este resumen es generado por máquina.

El núcleo celular, a menudo central, se mueve asimétricamente para apoyar las funciones celulares como la división y la migración. Las proteínas y las fuerzas citoesqueléticas impulsan este movimiento, crucial para la salud y la prevención de enfermedades.

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Last Updated: May 13, 2026

Single-Molecule Imaging of Nuclear Transport
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Published on: June 9, 2010

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09:31

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Área de la Ciencia:

  • Biología celular Biología celular.
  • Biología Molecular Biología Molecular
  • La biofísica es la biofísica.

Sus antecedentes:

  • El núcleo celular es típicamente central, pero cambia de posición durante los procesos celulares clave.
  • El posicionamiento nuclear es vital para la función celular, la organización y la señalización.

Objetivo del estudio:

  • Para explorar la maquinaria de proteínas y las fuerzas citoesqueléticas involucradas en el movimiento nuclear.
  • Para resaltar las implicaciones del posicionamiento nuclear interrumpido en la enfermedad.
  • Para discutir el papel de la posición nuclear en la organización celular y la señalización.

Principales métodos:

  • Revisión de la literatura sobre la mecánica nuclear y las interacciones de las proteínas.
  • Análisis de la dinámica citoesquelética y generación de fuerza.
  • Examen de modelos de enfermedades vinculados a defectos de posicionamiento nuclear.

Principales resultados:

  • Identificó "cajas de herramientas" de proteínas clave que median el movimiento y el anclaje nuclear.
  • Demostró el acoplamiento de las fuerzas citoesqueléticas al transporte nuclear.
  • Posicionamiento nuclear aberrante relacionado con varias enfermedades genéticas.

Conclusiones:

  • El posicionamiento nuclear es un proceso dinámico regulado por complejos proteicos específicos y fuerzas celulares.
  • El posicionamiento nuclear adecuado es esencial para la función celular normal y la salud del organismo.
  • Investigaciones adicionales sobre el posicionamiento nuclear pueden revelar nuevos objetivos terapéuticos para enfermedades relacionadas.