62 results found
    1. Cell Biology

    The sterol-responsive RNF145 E3 ubiquitin ligase mediates the degradation of HMG-CoA reductase together with gp78 and Hrd1

    Sam A Menzies et al.
    CRISPR/Cas9 genome-wide screens using sterol-sensitive endogenous HMG-CoA reductase (HMGCR) reporter identify the sterol-responsive RNF145 and gp78 as independently responsible for sterol-accelerated degradation of HMGCR, the rate-limiting enzyme of cholesterol biosynthesis.
    1. Cell Biology

    USP13 antagonizes gp78 to maintain functionality of a chaperone in ER-associated degradation

    Yanfen Liu et al.
    A deubiquitinase antagonizes the activity of an associated E3 ligase to prevent uncontrolled ubiquitination of a degradation machinery protein and thus maintain its functionality in protein quality control at the endoplasmic reticulum.
    1. Biochemistry and Chemical Biology
    2. Cell Biology

    AMPylation matches BiP activity to client protein load in the endoplasmic reticulum

    Steffen Preissler et al.
    Attaching a molecule of adenosine mono-phosphate (AMP) to the BiP protein at threonine 518 regulates its chaperone activity in the endoplasmic reticulum.
    1. Cell Biology

    Unstructured regions in IRE1α specify BiP-mediated destabilisation of the luminal domain dimer and repression of the UPR

    Niko Amin-Wetzel et al.
    Client protein-driven reversal of endoplasmic reticulum chaperone (BiP) mediated-repression is revealed as a principal component of the regulation of the unfolded protein response transducer IRE1 in cells.
    1. Biochemistry and Chemical Biology
    2. Cell Biology

    Calcium depletion challenges endoplasmic reticulum proteostasis by destabilising BiP-substrate complexes

    Steffen Preissler et al.
    Regulation of the endoplasmic reticulum chaperone BiP by calcium.
    1. Cell Biology

    Proinsulin misfolding is an early event in the progression to type 2 diabetes

    Anoop Arunagiri et al.
    Proinsulin misfolding, an established cause of diabetes in patients with INS gene mutations, is now observed in normal human pancreatic islets, and rodents with genetic predisposition to type 2 diabetes.
    1. Cell Biology

    Inadequate BiP availability defines endoplasmic reticulum stress

    Milena Vitale et al.
    The extent of (proteotoxic) endoplasmic reticulum stress, and the ensuing unfolded protein response activation, are commensurate with the extent of the chaperone BiP being sequestered by its client proteins.
    1. Biochemistry and Chemical Biology
    2. Cell Biology

    Physiological modulation of BiP activity by trans-protomer engagement of the interdomain linker

    Steffen Preissler et al.
    Interdomain linker-mediated oligomerization of the endoplasmic reticulum chaperone protein BiP responds to the unfolded protein burden
    1. Cell Biology
    2. Developmental Biology

    The CHORD protein CHP-1 regulates EGF receptor trafficking and signaling in C. elegans and in human cells

    Andrea Haag et al.
    The co-chaperone CHORDC1 is specifically required for epidermal growth factor receptor trafficking and signaling in Caenorhabditis elegans and in human cells.
    1. Genetics and Genomics

    PRD-2 directly regulates casein kinase I and counteracts nonsense-mediated decay in the Neurospora circadian clock

    Christina M Kelliher et al.
    Casein kinase I, a pivotal kinase in the circadian clock encoded by ck-1a, is positively regulated by a novel RNA-binding protein that protects ck-1a transcripts from nonsense-mediated decay.

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