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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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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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Directionality of Nuclear Transport01:42

Directionality of Nuclear Transport

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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...
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Nuclear Localization Signals and Import01:46

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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...
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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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Nuclear Export of mRNA02:31

Nuclear Export of mRNA

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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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Assay to Measure Nucleocytoplasmic Transport in Real Time within Motor Neuron-like NSC-34 Cells
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Nuclear transport proteins: structure, function, and disease relevance.

Yang Yang1, Lu Guo1, Lin Chen1

  • 1Department of Pulmonary and Critical Care Medicine, Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, China.

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This summary is machine-generated.

Nuclear transport proteins regulate macromolecule localization, impacting cell functions and disease. This review details their structure, function, and roles in health and disease, offering therapeutic insights.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Subcellular localization of biomacromolecules is essential for cellular function.
  • Nuclear transport governs the movement of macromolecules between the nucleus and cytoplasm.
  • Dysregulation of nuclear transport is implicated in diseases like cancer and neurodegeneration.

Purpose of the Study:

  • To provide a comprehensive overview of nuclear transport proteins.
  • To highlight recent findings on their structure and function.
  • To explore their roles in health and disease.

Main Methods:

  • Review of approximately three decades of research data.
  • Focus on recent studies of individual nuclear transport proteins.
  • Analysis of structure-function relationships.

Main Results:

  • Identified key proteins in nuclear transport: nucleoporins, karyopherins, and Ran system proteins.
  • Highlighted additional roles in mitosis, biomolecular condensation, and gene transcription.
  • Discussed the therapeutic potential of targeting nuclear transport, exemplified by Selinexor (KPT-330).

Conclusions:

  • Nuclear transport proteins are critical for fundamental biological processes.
  • Understanding these proteins offers insights into disease mechanisms.
  • This field holds promise for developing novel therapeutic strategies.