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Related Concept Videos

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...
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...
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...
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...
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 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...

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Related Experiment Video

Updated: Jul 1, 2026

Single-Molecule Imaging of Nuclear Transport
12:13

Single-Molecule Imaging of Nuclear Transport

Published on: June 9, 2010

Structure, dynamics and function of nuclear pore complexes.

Maximiliano A D'Angelo1, Martin W Hetzer

  • 1Molecular and Cell Biology Laboratory, Salk Institute for Biological Studies, La Jolla, CA 92037, USA.

Trends in Cell Biology
|September 13, 2008
PubMed
Summary
This summary is machine-generated.

Nuclear pore complexes (NPCs) are dynamic structures, not static channels. These protein assemblies regulate molecular traffic and influence processes like gene expression and cytoskeleton organization.

Related Experiment Videos

Last Updated: Jul 1, 2026

Single-Molecule Imaging of Nuclear Transport
12:13

Single-Molecule Imaging of Nuclear Transport

Published on: June 9, 2010

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Nuclear pore complexes (NPCs) form channels through the nuclear envelope, mediating transport between the nucleus and cytoplasm.
  • Historically, NPCs were considered static structures primarily for molecular trafficking control.
  • Emerging evidence reveals NPCs as dynamic, multiprotein assemblies with broader cellular roles.

Purpose of the Study:

  • To review recent advancements in understanding nuclear pore complex (NPC) biology.
  • To highlight the dynamic nature and diverse functions of NPCs.
  • To focus on NPC assembly, disassembly, maintenance, and functional roles.

Main Methods:

  • Review of current literature on nuclear pore complexes.
  • Synthesis of recent findings on NPC structure and dynamics.
  • Analysis of NPC involvement in cellular processes.

Main Results:

  • NPCs are not static but are highly dynamic multiprotein assemblies.
  • NPCs play crucial roles beyond molecular trafficking, including cytoskeleton organization and gene expression.
  • Recent research has elucidated the intricate processes of NPC assembly, disassembly, and maintenance.

Conclusions:

  • The understanding of nuclear pore complexes has evolved from static channels to dynamic regulators of cellular processes.
  • NPCs are central to diverse cellular functions, impacting gene expression and cytoskeletal organization.
  • Continued research into NPC dynamics and function is vital for understanding cell biology.