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    UBQLN proteins in health and disease with a focus on UBQLN2 in ALS/FTD

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    Author
    Lin, Brian C
    Higgins, Nicole R
    Phung, Trong H
    Monteiro, Mervyn J
    Date
    2021-07-17
    Journal
    FEBS Journal
    Publisher
    Wiley-Blackwell
    Type
    Article
    
    Metadata
    Show full item record
    See at
    https://doi.org/10.1111/febs.16129
    Abstract
    Ubiquilin (UBQLN) proteins are a dynamic and versatile family of proteins found in all eukaryotes that function in the regulation of proteostasis. Besides their canonical function as shuttle factors in delivering misfolded proteins to the proteasome and autophagy systems for degradation, there is emerging evidence that UBQLN proteins play broader roles in proteostasis. New information suggests the proteins function as chaperones in protein folding, protecting proteins prior to membrane insertion, and as guardians for mitochondrial protein import. In this review, we describe the evidence for these different roles, highlighting how different domains of the proteins impart these functions. We also describe how changes in the structure and phase separation properties of UBQLNs may regulate their activity and function. Finally, we discuss the pathogenic mechanisms by which mutations in UBQLN2 cause amyotrophic lateral sclerosis and frontotemporal dementia. We describe the animal model systems made for different UBQLN2 mutations and how lessons learnt from these systems provide fundamental insight into the molecular mechanisms by which UBQLN2 mutations drive disease pathogenesis through disturbances in proteostasis. © 2021 Federation of European Biochemical Societies
    Rights/Terms
    © 2021 Federation of European Biochemical Societies.
    Keyword
    ALS
    OXPHOS
    UBQLN2
    mitochondria
    Identifier to cite or link to this item
    http://hdl.handle.net/10713/16333
    ae974a485f413a2113503eed53cd6c53
    10.1111/febs.16129
    Scopus Count
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