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Infective proteins: the prion puzzle.

F Ceciliani1, P Pergami

  • 1Dipartimento di Patologia Animale, Igiene e Sanità Pubblica Veterinaria, Università di Milano, Via Celoria 10, 20133 Milan, Italy. Fabrizio.Ceciliani@unimi.it

Current Protein & Peptide Science
|October 9, 2002
PubMed
Summary

Prions are unique infectious agents, essentially misfolded proteins that cause neurodegenerative diseases like Spongiform Encephalopathies. This review explores prion protein structure, function, and the molecular mechanisms behind their infectious conformational changes.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Infectious Diseases

Background:

  • Prion-related disorders, or prionoses, are unique infectious diseases.
  • They stem from the misfolding of normal cellular prion proteins (PrP(C)) into pathological scrapie isoforms (PrP(Sc)).
  • This conformational change, from alpha-helix to beta-sheet, leads to insoluble aggregates and neurodegeneration.

Purpose of the Study:

  • To review the structure of prion proteins.
  • To discuss the cellular cycle of PrP(C).
  • To explore hypotheses on the biochemical function of prion proteins and the mechanisms of conformational conversion.

Main Methods:

  • Literature review focusing on prion protein structure and function.
  • Analysis of proposed molecular mechanisms for prion protein conformational changes.

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  • Discussion of prionoses etiology and pathogenesis.

    • Main Results:

    • Prion protein misfolding is central to prion diseases.
    • PrP(Sc) forms amyloid-like fibrils, causing Spongiform Encephalopathies.
    • The review synthesizes current understanding of prion protein biology and disease development.

    Conclusions:

    • Prions exemplify infectious agents through protein conformational change.
    • Understanding these mechanisms is key to addressing neurodegenerative diseases.
    • Further research into prion protein function and conversion is warranted.