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Related Concept Videos

Nuclear Export01:42

Nuclear Export

4.7K
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...
4.7K
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...
4.4K
Nuclear Localization Signals and Import01:46

Nuclear Localization Signals and Import

7.4K
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 Export of mRNA02:31

Nuclear Export of mRNA

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Subcellular Fractionation of Primary Chronic Lymphocytic Leukemia Cells to Monitor Nuclear/Cytoplasmic Protein Trafficking
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Targeting nuclear import and export in hematological malignancies.

Boaz Nachmias1, Aaron D Schimmer2

  • 1Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada.

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Nuclear transport proteins, importins and exportins, are crucial in cancer. Their dysregulation drives hematological malignancies, highlighting them as key therapeutic targets for novel anticancer drugs.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Oncology

Background:

  • Nuclear transport is vital for cell function, regulated by importins and exportins.
  • Aberrant protein localization by these transporters contributes to tumorigenesis.
  • Overexpression of importins and exportins is linked to various cancers, affecting cell growth, drug resistance, and the tumor microenvironment.

Purpose of the Study:

  • To review the role of importins and exportins in hematological malignancies.
  • To discuss current preclinical and clinical data regarding these proteins in cancer.
  • To identify importins and exportins as potential therapeutic targets in cancer treatment.

Main Methods:

  • Literature review of preclinical and clinical studies.
  • Analysis of the role of importins and exportins in cancer pathways.
  • Identification of therapeutic strategies targeting nuclear transport proteins.

Main Results:

  • Importins and exportins are implicated in the development and progression of hematological malignancies.
  • Their overexpression correlates with adverse clinical outcomes.
  • Targeting these proteins shows promise for novel cancer therapies.

Conclusions:

  • Importins and exportins are significant players in hematological cancers.
  • Understanding their function provides new avenues for therapeutic intervention.
  • Inhibitors of nuclear transport proteins represent a promising class of anticancer drugs.