期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 276, 期 18, 页码 15489-15497出版社
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M100288200
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The formation of protease-resistant prion protein (PrP-res or PrPSc) involves selective interactions between PrP-res and its normal protease-sensitive counterpart, PrP-sen or PrPC. Previous studies have shown that synthetic peptide fragments of the PrP sequence corresponding to residues 119-136 of hamster PrP (Ha119-136) can selectively block PrP-res formation in cell-free systems and scrapie-infected tissue culture cells. Here we show that two other peptides corresponding to residues 166-179 (Ha166-179) and 200-223 (Ha200-223) also potently inhibit the PrP-res induced cell-free conversion of PrP-sen to the protease-resistant state. In contrast, Ha121-141, Ha180-199, and Ha218-232 were much less effective as inhibitors. Mechanistic analyses indicated that Ha166-179, Ha200-223, and peptides containing residues 119-136 inhibit primarily by binding to PrP-sen and blocking its binding to PrP-res, Circular dichroism analyses indicated that Ha117-141 and Ha200-223, but not non-inhibitory peptides, readily formed high beta -sheet structures when placed under the conditions of the conversion reaction, We conclude that these inhibitory peptides may mimic contact surfaces between PrP-res and PrP-sen and thereby serve as models of potential therapeutic agents for transmissible spongiform encephalopathies.
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