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The binding of prion proteins to serum components is affected by detergent extraction conditions
Author(s) -
Shaked Yuval,
Engelstein Roni,
Gabizon Ruth
Publication year - 2002
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1046/j.1471-4159.2002.00995.x
Subject(s) - extraction (chemistry) , prion proteins , prion protein , chemistry , chromatography , biochemistry , biology , medicine , disease
As many GPI anchored proteins, PrP C and its abnormal conformer PrP Sc , are inserted into membrane microdomains known as rafts. Upon raft disruption, PrP C becomes soluble, while PrP Sc aggregates into insoluble structures. It was recently published that, as opposed to PrP C , PrP Sc , as well as its protease resistant core PrP27‐30, can bind specifically to plasminogen and other serum components. These findings were suggested to have important physiological implications in transmissible spongiform encephalopathies (TSE) diagnosis and pathogenesis. In this work, we show that the binding of PrP Sc or PrP 27–30 to serum proteins occurs only at specific detergent combinations, in which disease associated PrPs are present in aggregated structures. At detergent conditions in which rafts are intact, it is actually PrP C. that binds to blood proteins, albeit not directly, but through neighboring rafts components. Our results therefore indicate that the binding of PrP Sc to blood components has no physiological relevance.