Recombinant amyloidogenic domain of ApoA-I: analysis of its fibrillogenic potential(365 views) Di Gaetano S, Guglielmi F, Arciello A, Mangione P, Monti M, Pagnozzi D, Raimondi S, Giorgetti S, Orru S, Canale C, Pucci P, Dobson CM, Bellotti V, Piccoli R
Biochemical And Biophysical Research Communications (ISSN: 0006-291x, 0006-291xprint), 2006 Dec 8; 351(1): 223-228.
Istituto di Biostrutture e Bioimmagini, CNR, Napoli, 80134, Italy
Dipartimento di Biologia Strutturale e Funzionale, Università di Napoli Federico II, via Cinthia 4, Napoli, 80126, Italy
CEINGE Biotecnologie Avanzate, Napoli, 80131, Italy
Dipartimento di Chimica Organica e Biochimica, Università di Napoli Federico II, Napoli, 80126, Italy
Laboratorio di Biotecnologie IRCCS, Pavia, 27100, Italy
Dipartimento di Fisica, Università di Genova, Genova, 16146, Italy
Department of Chemistry, University of Cambridge, Cambridge, CB2 IEW, United Kingdom
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Recombinant amyloidogenic domain of ApoA-I: analysis of its fibrillogenic potential
A variety of amyloid diseases are associated with fibrillar aggregates from N-terminal fragments of ApoA-I generated through a largely unexplored multi-step process. The understanding of the molecular mechanism is impaired by the lack of suitable amounts of the fibrillogenic polypeptides that could not be produced by recombinant methods so far. We report the production and the conformational analysis of recombinant ApoA-I 1-93 fragment. Similarly to the polypeptide isolated ex vivo, a pH switch from 7 to 4 induces a fast and reversible conformational transition to a helical state and leads to the identification of a key intermediate in the fibrillogenesis process. Limited proteolysis experiments suggested that the C-terminal region is involved in helix formation. The recombinant polypeptide generates fibrils at pH 4 on a time scale comparable with that of the native fragment. These findings open the way to studies on structural, thermodynamic, and kinetic aspects of ApoA-I fibrillogenesis. (c) 2006 Elsevier Inc. All rights reserved.
Recombinant amyloidogenic domain of ApoA-I: analysis of its fibrillogenic potential
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Recombinant amyloidogenic domain of ApoA-I: analysis of its fibrillogenic potential