title: Conformational diseases and structure-toxicity relationships: lessons from prion-derived peptides.
abstract: The physiological form of the prion protein is normally expressed in mammalian cell and is highly conserved among species, although its role in cellular function remains elusive. Available evidence suggests that this protein is essential for neuronal integrity in the brain, possibly with a role in copper metabolism and cellular response to oxidative stress. In prion diseases, the benign cellular form of the protein is converted into an insoluble, protease-resistant abnormal scrapie form. This conversion parallels a conformational change of the polypeptide from a predominantly alpha-helical to a highly beta-sheet secondary structure. The scrapie form accumulates in the central nervous system of affected individuals, and its protease-resistant core aggregates into amyloid fibrils outside the cell. The pathogenesis and molecular basis of the nerve cell loss that accompanies this process are not understood. Limited structural information is available on aggregate formation by this protein as the possible cause of these diseases and on its toxicity. A large amount of structure-activity studies is based on the prion fragment approach, but the resulting information is often difficult to untangle. This overview focuses on the most relevant structural and functional aspects of the prion-induced conformational disease linked to peptides derived from the unstructured N-terminal and globular C-terminal domains.
authors.affiliation: Dipartimento delle Scienze Biologiche, C.I.R.Pe.B., Università Federico II di Napoli, Istituto di Biostrutture e Bioimmagini, CNR, Via Mezzocannone 16, 80134 Napoli, Italy.
authors.forename: Luisa
authors.initials: L
authors.lastname: Ronga
authors.forename: Pasquale
authors.initials: P
authors.lastname: Palladino
authors.forename: Susan
authors.initials: S
authors.lastname: Costantini
authors.forename: Angelo
authors.initials: A
authors.lastname: Facchiano
authors.forename: Menotti
authors.initials: M
authors.lastname: Ruvo
authors.forename: Ettore
authors.initials: E
authors.lastname: Benedetti
authors.forename: Raffaele
authors.initials: R
authors.lastname: Ragone
authors.forename: Filomena
authors.initials: F
authors.lastname: Rossi
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D006801:Humans; D008670:Metals / Q000378:metabolism; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009410:Nerve Degeneration; D017096:Prion Diseases / Q000209:etiology* / Q000503:physiopathology; D011328:Prions / Q000737:chemistry* / Q000235:genetics / Q000502:physiology; D011485:Protein Binding; D011487:Protein Conformation; D017434:Protein Structure, Tertiary; D013816:Thermodynamics
chemical_list: D008670:Metals; D011328:Prions