Abstract
According to the Koch postulates an infectious organism is the one that can be isolated from an host suffering from a disorder, can be propagated in laboratory, can cause the same disease when introduced in another host, and finally, can be re-isolated from the host itself. If we change the word "organism" with the word protein we have a quite exact description of prions. Prion related disorders are a very unique category of infectious diseases. The ethiology of the so-called prionoses is related to the conversion of a normal protein (PrPC, the cellular isoform of the prion protein) into a pathological form (the scrapie isoform of the prion protein , PrPSc) which is able to propagate . The striking difference between the two forms seems to consist in a conformational modification of a mainly a-helix structured PrPC into a mainly b-sheet PrPSc. The latter forms amyloid-like fibrils which precipitate into insoluble aggregates leading to the neurodegenerative changes specific of Spongiform Encephalopathies. This review will focus on the structure of the prion proteins and on PrPC cellular cycle, and it will discuss some hypothesis about the protein biochemical function. Finally, the various molecular mechanisms proposed for the development of conformational modifications will be reviewed, i.e. how a protein can become infectious by simply changing its structure.
Keywords: Infective Proteins, Prion, Prionoses, Pathogenesis, BSE, Scrapie, TME, Cronic Wasting Disease, FSE, Exotic Ungulate Encephalopathy
Current Protein & Peptide Science
Title: Infective Proteins: The Prion Puzzle
Volume: 2 Issue: 3
Author(s): Fabrizio Ceciliani and Paola Pergami
Affiliation:
Keywords: Infective Proteins, Prion, Prionoses, Pathogenesis, BSE, Scrapie, TME, Cronic Wasting Disease, FSE, Exotic Ungulate Encephalopathy
Abstract: According to the Koch postulates an infectious organism is the one that can be isolated from an host suffering from a disorder, can be propagated in laboratory, can cause the same disease when introduced in another host, and finally, can be re-isolated from the host itself. If we change the word "organism" with the word protein we have a quite exact description of prions. Prion related disorders are a very unique category of infectious diseases. The ethiology of the so-called prionoses is related to the conversion of a normal protein (PrPC, the cellular isoform of the prion protein) into a pathological form (the scrapie isoform of the prion protein , PrPSc) which is able to propagate . The striking difference between the two forms seems to consist in a conformational modification of a mainly a-helix structured PrPC into a mainly b-sheet PrPSc. The latter forms amyloid-like fibrils which precipitate into insoluble aggregates leading to the neurodegenerative changes specific of Spongiform Encephalopathies. This review will focus on the structure of the prion proteins and on PrPC cellular cycle, and it will discuss some hypothesis about the protein biochemical function. Finally, the various molecular mechanisms proposed for the development of conformational modifications will be reviewed, i.e. how a protein can become infectious by simply changing its structure.
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Cite this article as:
Ceciliani Fabrizio and Pergami Paola, Infective Proteins: The Prion Puzzle, Current Protein & Peptide Science 2001; 2 (3) . https://dx.doi.org/10.2174/1389203013381099
DOI https://dx.doi.org/10.2174/1389203013381099 |
Print ISSN 1389-2037 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-5550 |
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