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Giuseppe Legname,1,2*Ilia V. Baskakov,1,2*Hoang-Oanh B. Nguyen,1Detlev Riesner,6Fred E. Cohen,1,3,4Stephen J. DeArmond,1,5Stanley B. Prusiner1,2,4
Recombinant mouse prion protein (recMoPrP) produced in Escherichiacoli was polymerized into amyloid fibrils that represent a subsetof ß sheetrich structures. Fibrils consistingof recMoPrP(89230) were inoculated intracerebrally intotransgenic (Tg) mice expressing MoPrP(89231). The micedeveloped neurologic dysfunction between 380 and 660 days afterinoculation. Brain extracts showed protease-resistant PrP byWestern blotting; these extracts transmitted disease to wild-typeFVB mice and Tg mice overexpressing PrP, with incubation timesof 150 and 90 days, respectively. Neuropathological findingssuggest that a novel prion strain was created. Our results providecompelling evidence that prions are infectious proteins.
1 Institute for Neurodegenerative Diseases, University of California, San Francisco, CA 94143, USA. 2 Department of Neurology, University of California, San Francisco, CA 94143, USA. 3 Department of Cellular and Molecular Pharmacology, University of California, San Francisco, CA 94143, USA. 4 Department of Biochemistry and Biophysics, University of California, San Francisco, CA 94143, USA. 5 Department of Pathology, University of California, San Francisco, CA 94143, USA. 6 Institut für Physikalische Biologie, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany.
* These two authors contributed equally to this work.
Present address: Medical Biotechnology Center, University ofMaryland Biotechnology Institute, Baltimore, MD 21201, USA.
To whom correspondence should be addressed. E-mail: stanley{at}itsa.ucsf.edu
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