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Related Concept Videos

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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Nuclear Export01:42

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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.
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Nuclear Protein Sorting01:34

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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.
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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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Exocytosis is a process that releases molecules outside the cell. Like other bulk transport mechanisms, exocytosis requires energy.
Exocytosis is the opposite of endocytosis, which brings molecules inside the cell. Sometimes, the released materials are signaling molecules. For example, neurons typically use exocytosis to release neurotransmitters. Cells also use exocytosis to insert proteins such as ion channels into their cell membranes, secrete proteins for use in the extracellular matrix, or...
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One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that carry out specialized functions. Since biological membranes are only selectively permeable to solutes, they help create a compartment with controlled conditions inside an organelle. These microenvironments are tailored to the organelle's specific functions and help isolate them from the surrounding cytosol.
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Single-Molecule Imaging of Nuclear Transport
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Nuclear envelope budding: Getting large macromolecular complexes out of the nucleus.

Kevin C Sule1, Mitsutoshi Nakamura1, Susan M Parkhurst1

  • 1Basic Sciences Division, Fred Hutchinson Cancer Center, Seattle, Washington, USA.

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PubMed
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Nuclear Envelope (NE)-budding is a novel pathway for exporting large molecules from the nucleus to the cytoplasm. This process bypasses traditional nuclear pores and is crucial for cellular functions and disease progression.

Keywords:
PavarottiTorsinTumbleweedWASHactin bundlingactin nucleationdFz2Cnuclear exitvesicle-mediated nucleocytoplasmic transportwash regulatory complex

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Nuclear export of macromolecules is vital for cellular and developmental processes.
  • Dysregulation of nuclear export is linked to diseases, including cancer.
  • Nuclear Envelope (NE)-budding is an emerging pathway for exporting large molecular complexes.

Purpose of the Study:

  • To summarize current knowledge on the regulatory and structural machinery of NE-budding.
  • To highlight the biological importance and clinical relevance of NE-budding.
  • To provide an overview of this intriguing nuclear export process.

Main Methods:

  • Literature review and synthesis of existing research on NE-budding.
  • Comparison of NE-budding with canonical nuclear export and viral egress mechanisms.
  • Analysis of proposed regulatory and structural components involved in NE-budding.

Main Results:

  • NE-budding facilitates the export of large macromolecular complexes by enveloping them within the inner nuclear membrane.
  • This pathway bypasses the nuclear pore complex, offering an alternative route for nuclear export.
  • NE-budding is a conserved process sharing similarities with herpesvirus nuclear egress.

Conclusions:

  • NE-budding represents a significant, yet understudied, mechanism for nuclear export of large complexes.
  • Understanding NE-budding machinery is critical for comprehending its role in cellular functions and diseases.
  • Further research is needed to elucidate the regulatory and structural details of NE-budding.