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Prion protein structural features indicate possible relations to signal peptidases
R Glockshuber1, S Hornemann, M Billeter
1Institut für Molekularbiologie und Biophysik, Eidgenössische Technische Hochschule-Hönggerberg, Zürich, Switzerland. RUDI@MOL.BIOL.ETHZ.CH
FEBS Letters
|May 26, 1998
Summary
Transmissible spongiform encephalopathies (TSEs) are linked to cellular prion protein (PrP(C)) dysfunction. This study reveals structural similarities between PrP(C) and signal peptidases, suggesting a novel function for PrP(C).
Area of Science:
- Neuroscience
- Biochemistry
- Structural Biology
Background:
- Transmissible spongiform encephalopathies (TSEs) are fatal neurodegenerative diseases.
- The cellular prion protein (PrP(C)) is implicated in TSE pathogenesis, but its function remains largely unknown.
- Understanding PrP(C) function is critical for TSE research.
Purpose of the Study:
- To investigate the function of PrP(C) by exploring its structural characteristics.
- To identify potential structural similarities between PrP(C) and other known proteins.
Main Methods:
- Structural analysis of the C-terminal domain of PrP(C) (residues 121-231).
- Comparison of PrP(C) structure with soluble domains of membrane-anchored signal peptidases.
- Sequence identity and similarity analysis between murine PrP and rat signal peptidase.
Main Results:
- The C-terminal domain of PrP(C) exhibits structural similarities to signal peptidases.
- A 23% sequence identity and 41% similarity were found between residues 121-217 of murine PrP and a rat signal peptidase catalytic domain.
- Key PrP residues (Tyr-128, His-177) align with presumed active-site residues of signal peptidases and are spatially close in the 3D structure.
Conclusions:
- PrP(C) may share functional or evolutionary links with signal peptidases.
- The structural findings suggest a potential enzymatic or signaling role for PrP(C).
- Further research is warranted to elucidate the precise function of PrP(C) in cellular processes and TSEs.