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ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
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Novel RNA-Binding Proteins Isolation by the RaPID Methodology
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Ribosome-associated protein quality control.

Onn Brandman, Ramanujan S Hegde

    Nature Structural & Molecular Biology
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    PubMed
    Summary
    This summary is machine-generated.

    Ribosome-associated quality control pathways prevent cellular damage by degrading faulty proteins during interrupted translation. This review details the discovery and molecular mechanisms of this essential eukaryotic process.

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    Area of Science:

    • Molecular Biology
    • Cellular Biology
    • Biochemistry

    Background:

    • Protein synthesis is fundamental for cellular function but can be disrupted by various errors.
    • Stalled ribosomes trigger cellular mechanisms for recycling, quality control, and stress signaling.

    Purpose of the Study:

    • To review the discovery and molecular dissection of the eukaryotic ribosome-associated quality-control (RAQC) pathway.
    • To elucidate the mechanisms involved in degrading nascent polypeptides from interrupted translation.

    Main Methods:

    • Literature review of studies on ribosome function and quality control.
    • Analysis of molecular mechanisms underlying nascent polypeptide degradation.
    • Examination of eukaryotic cellular responses to translation stress.

    Main Results:

    • Identification and characterization of the RAQC pathway in eukaryotes.
    • Understanding the molecular triggers and components of the RAQC pathway.
    • Elucidation of how nascent polypeptides are targeted for degradation upon translation arrest.

    Conclusions:

    • The RAQC pathway is a critical cellular mechanism for maintaining proteostasis.
    • Dissecting the RAQC pathway provides insights into cellular responses to translational stress.
    • This pathway ensures the removal of potentially harmful polypeptide products from interrupted translation.