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Related Concept Videos

Nuclear Protein Sorting01:34

Nuclear Protein Sorting

6.7K
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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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 Export of mRNA02:31

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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 Localization Signals and Import01:46

Nuclear Localization Signals and Import

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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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Single-Molecule Imaging of Nuclear Transport
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Single-Molecule Imaging of Nuclear Transport

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The nuclear pore complex--structure and function at a glance.

Greg Kabachinski, Thomas U Schwartz

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    Summary
    This summary is machine-generated.

    Nuclear pore complexes (NPCs) regulate nuclear transport, crucial for cell function and human diseases. This review covers NPC structure, transport regulation, and assembly/disassembly processes.

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    Membrane Transport Processes Analyzed by a Highly Parallel Nanopore Chip System at Single Protein Resolution
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    Validation of a Mouse Model to Disrupt LINC Complexes in a Cell-specific Manner
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    Area of Science:

    • Cell Biology
    • Molecular Biology
    • Biochemistry

    Background:

    • Nuclear pore complexes (NPCs) are essential cellular structures regulating transport between the nucleus and cytoplasm.
    • NPCs are implicated in various human diseases, highlighting their critical biological roles.
    • These complexes are composed of numerous proteins called nucleoporins.

    Purpose of the Study:

    • To provide a comprehensive overview of the current understanding of nuclear pore complex structure and function.
    • To elucidate the mechanisms regulating nucleocytoplasmic transport.
    • To discuss the assembly and disassembly processes of NPCs and future research directions.

    Main Methods:

    • Literature review and synthesis of existing research on NPCs.
    • Analysis of structural data for individual nucleoporins and the assembled NPC.
    • Discussion of regulatory mechanisms for transport and NPC dynamics.

    Main Results:

    • NPCs form aqueous channels controlling the passage of proteins and RNA.
    • Nucleoporins form a complex network constituting the NPC structure.
    • The cell employs specific mechanisms to regulate NPC assembly, disassembly, and transport activities.

    Conclusions:

    • Understanding NPC structure and function is vital for comprehending cellular processes and disease pathogenesis.
    • Further research into NPC regulation and dynamics will uncover new therapeutic targets.
    • This review consolidates current knowledge and identifies key areas for future investigation in nuclear pore biology.