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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 Export of mRNA02:31

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Initiation of Translation02:33

Initiation of Translation

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Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
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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

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.
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Xenopus laevis as a Model to Identify Translation Impairment
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Translation initiation mediated by nuclear cap-binding protein complex.

Incheol Ryu, Yoon Ki Kim

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    |January 17, 2017
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    Summary
    This summary is machine-generated.

    Mammalian mRNA translation uses two pathways: cap-binding complex (CBC)-dependent translation (CT) and eIF4E-dependent translation (ET). Recent studies reveal overlapping roles in protein synthesis and mRNA surveillance for both CT and ET.

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    An In Vitro Single-Molecule Imaging Assay for the Analysis of Cap-Dependent Translation Kinetics
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    Area of Science:

    • Molecular Biology
    • Genetics
    • Biochemistry

    Background:

    • Cap-dependent translation initiation in mammals involves two main pathways: cap-binding complex (CBC)-dependent translation (CT) and eIF4E-dependent translation (ET).
    • While traditionally CT is linked to mRNA surveillance (e.g., nonsense-mediated mRNA decay) and ET to bulk protein synthesis, recent findings suggest functional overlap.
    • Understanding these distinct yet interconnected mechanisms is crucial for comprehending gene expression regulation.

    Purpose of the Study:

    • To review and compare the molecular characteristics of CT and ET.
    • To highlight the emerging and overlapping roles of CT and ET in both translation and mRNA surveillance.
    • To provide insights into the nuanced regulation of cap-dependent mRNA translation.

    Main Methods:

    • Literature review and synthesis of recent research findings.
    • Comparative analysis of molecular features and biological functions of CT and ET.
    • Focus on studies demonstrating shared roles in translation and mRNA surveillance.

    Main Results:

    • Both CT and ET initiate cap-dependent translation, sharing common features.
    • Evidence indicates CT can drive translation for specific mRNAs and ET participates in mRNA surveillance.
    • CT and ET exhibit overlapping functions, challenging previous distinct role assignments.

    Conclusions:

    • CT and ET are not mutually exclusive in their functions.
    • Emerging evidence points to a more complex interplay between CT and ET in regulating protein synthesis and mRNA fate.
    • Further research is needed to fully elucidate the intricate roles of CT and ET in cellular processes.