期刊
BIOCHEMISTRY
卷 48, 期 19, 页码 4198-4208出版社
AMER CHEMICAL SOC
DOI: 10.1021/bi900009d
关键词
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资金
- Fundacao para a Ciencia e Tecnologia (Portugal) [SFRH/BD/14337/2003]
- Australian Research Council
- Potter Foundation
- Fundação para a Ciência e a Tecnologia [SFRH/BD/14337/2003] Funding Source: FCT
Prion diseases result from a post-translational modification of the physiological prion protein (PrPC) into a scrapie isoform (PrPsc). The PrP(106-126) fragment conserved among various abnormal variants and shows PrPsc pathogenic properties. It has been proposed that the PrP(106-126) fragment may exhibit its toxic effects through membrane pore formation. Our previous studies showed that PrP(106-126) does not interact with membranes under physiological conditions. In the present study, PrP(106-126) affinity for membranes was increased by modifying PrP(106-126) with a M112W substitution, and pore formation was further evaluated. However, while the peptide exhibited an increased local concentration in the membrane, this did not lead to the induction of membrane permeabilization, as verified by fluorescence methodologies and surface plasmon resonance. These results further support the idea that PrP(106-126) toxicity is not a consequence of peptide-membrane interaction and pore formation.
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