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Clinical Microbiology Reviews, July 1999, p. 429-444, Vol. 12, No. 3
0893-8512/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Cellular Biology of Prion Diseases

David A. Harris*

Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri 63110

Prion diseases are fatal neurodegenerative disorders of humans and animals that are important because of their impact on public health and because they exemplify a novel mechanism of infectivity and biological information transfer. These diseases are caused by conformational conversion of a normal host glycoprotein (PrPC) into an infectious isoform (PrPSc) that is devoid of nucleic acid. This review focuses on the current understanding of prion diseases at the cell biological level. The characteristics of the diseases are introduced, and a brief history and description of the prion hypothesis are given. Information is then presented about the structure, expression, biosynthesis, and possible function of PrPC, as well as its posttranslational processing, cellular localization, and trafficking. The latest findings concerning PrPSc are then discussed, including cell culture systems used to generate this pathogenic isoform, the subcellular distribution of the protein, its membrane attachment, proteolytic processing, and its kinetics and sites of synthesis. Information is also provided on molecular models of the PrPCright-arrowPrPSc conversion reaction and the possible role of cellular chaperones. The review concludes with suggestions of several important avenues for future investigation.

* Mailing address: Department of Cell Biology and Physiology, Washington University School of Medicine, 660 South Euclid Ave., St. Louis, MO 63110. Phone: (314) 362-4690. Fax: (314) 362-7463. E-mail: dharris{at}cellbio.wustl.edu.

Clinical Microbiology Reviews, July 1999, p. 429-444, Vol. 12, No. 3
0893-8512/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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