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| Content Provider | PubMed Central |
|---|---|
| Author | Horiuchi, M. Caughey, B. |
| Abstract | In the transmissible spongiform encephalopathies, normal prion protein (PrP-sen) is converted to a protease-resistant isoform, PrP-res, by an apparent self-propagating activity of the latter. Here we describe new, more physiological cell-free systems for analyzing the initial binding and subsequent conversion reactions between PrP-sen and PrP-res. These systems allowed the use of antibodies to map the sites of interaction between PrP-sen and PrP-res. Binding of antibodies (alpha219-232) to hamster PrP-sen residues 219-232 inhibited the binding of PrP-sen to PrP-res and the subsequent generation of PK-resistant PrP. However, antibodies to several other parts of PrP-sen did not inhibit. The alpha219-232 epitope itself was not required for PrP-res binding; thus, inhibition by alpha219-232 was likely due to steric blocking of a binding site that is close to, but does not include the epitope in the folded PrP-sen structure. The selectivity of the binding reaction was tested by incubating PrP-res with cell lysates or culture supernatants. Only PrP-sen was observed to bind PrP-res. This highly selective binding to PrP-res and the localized nature of the binding site on PrP-sen support the idea that PrP-sen serves as a critical ligand and/or receptor for PrP-res in the course of PrP-res propagation and pathogenesis in vivo. |
| Related Links | http://dx.doi.org/10.1093/emboj/18.12.3193 |
| Starting Page | 3193 |
| File Format | |
| ISSN | 14602075 |
| e-ISSN | 14602075 |
| Journal | The EMBO Journal |
| Issue Number | 12 |
| Volume Number | 18 |
| Language | English |
| Publisher Date | 1999-06-15 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Neuroscience Immunology and Microbiology Medicine Molecular Biology |
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