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Sökning: WFRF:(Budka Herbert)

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  • Sörgjerd, Karin, 1977-, et al. (författare)
  • BiP can function as a molecular shepherd that alleviates oligomer toxicity and amass amyloid
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • A wide range of diseases are linked to protein misfolding and aggregation inside and outside the cell. It is of utmost interest to understand how the molecular chaperone machinery of the endoplasmic reticulum (ER) handles the expression of highly amyloidogenic proteins. We explored the hypothesis that the ER located Hsp70 molecular chaperone BiP plays a crucial role in amyloid diseases and influence the misfolding process and disease progression. We used the transthyretin mutant TTR D18G associated with an unusual central nervous system amyloid disease as the model substrate because it represents the most destabilized and degraded TTR variant known. Over-expression of TTR D18G in concert with BiP showed that BiP selectively recognize the amyloidogenic mutant protein as compared to wild type in human cells and collects the mutant in stable intermediate size oligomers within the ER. Furthermore, whereas TTR D18G was found to be highly cytotoxic to neuroblastoma cells, TTR D18G preincubated with BiP was non-toxic indicating that BiP protects the cell from cytotoxicity. BiP was also found present in cerebellar amyloid deposits and co-localized with TTR in a TTR D18G patient suggesting that the complex can be found in the extracellular space. We promote a fundamental role of BiP in misfolding diseases and describe a molecular shepharding function of BiP in sequestrating amyloidogenic protein molecules in benign oligomeric states.
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