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Prion protein structural features indicate possible relations to signal peptidases
Author(s) -
Glockshuber Rudi,
Hornemann Simone,
Billeter Martin,
Riek Roland,
Wider Gerhard,
Wüthrich Kurt
Publication year - 1998
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(98)00372-x
Subject(s) - prion protein , signal (programming language) , chemistry , computational biology , biology , computer science , medicine , disease , pathology , programming language
Transmissible spongiform encephalopathies (TSEs) in mammalian species are believed to be caused by an oligomeric isoform, PrP Sc , of the cellular prion protein, PrP C . One of the key questions in TSE research is how the observed accumulation of PrP Sc , or possibly the concomitant depletion of PrP C can cause fatal brain damage. Elucidation of the so far unknown function of PrP C is therefore of crucial importance. PrP C is a membrane‐anchored cell surface protein that possesses a so far unique three‐dimensional structure. While the N‐terminal segment 23–120 of PrP C is flexibly disordered, its C‐terminal residues 121–231 form a globular domain with three α‐helices and a two‐stranded β‐sheet. Here we report the observation of structural similarities between the domain of PrP(121–231) and the soluble domains of membrane‐anchored signal peptidases. At the level of the primary structure we find 23% identity and 41% similarity between residues 121–217 of the C‐terminal domain of murine PrP and a catalytic domain of the rat signal peptidase. The invariant PrP residues Tyr‐128 and His‐177 align with the two presumed active‐site residues of signal peptidases and are in close spatial proximity in the three‐dimensional structure of PrP(121–231).