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Nucleic acids in prion preparations: unspecific background or essential component?

K Kellings1, S B Prusiner, D Riesner

  • 1Heinrich-Heine-Universität Düsseldorf, Institut für Physikalische Biologie, Germany.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|March 29, 1994
PubMed
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Researchers investigated scrapie prions, finding that nucleic acids persist even after purification attempts. Modified purification methods and enzymatic degradation did not significantly reduce the particle-to-infectivity ratio, suggesting a complex relationship.

Area of Science:

  • Virology
  • Molecular Biology
  • Biochemistry

Background:

  • Analysis of purified scrapie prions revealed nucleic acids up to 1100 nucleotides.
  • Previous studies defined potential characteristics of scrapie-specific nucleic acids based on size and particle-to-infectivity ratio (P:I).

Purpose of the Study:

  • To decrease the amount of nucleic acids associated with scrapie prions.
  • To modify purification schemes to reduce the particle-to-infectivity (P:I) ratio.

Main Methods:

  • Modified purification using ultrafiltration instead of sucrose gradients.
  • Nucleic acid degradation using Benzonase, both post-purification and pre-incubation.
  • Combined nucleic acid degradation using Zn2+ hydrolysis and Benzonase digestion.

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Main Results:

  • Ultrafiltration and Benzonase treatment did not significantly reduce the P:I ratio.
  • Pre-incubation with Benzonase maintained prion infectivity but did not lower the P:I ratio.
  • Zn2+ hydrolysis combined with Benzonase digestion showed more efficient nucleic acid degradation with complete infectivity recovery.

Conclusions:

  • Standard and modified purification methods failed to significantly reduce the P:I ratio of scrapie prions.
  • Combined enzymatic and chemical degradation methods show promise for reducing nucleic acid content while preserving infectivity.
  • Further large-scale preparations are needed to determine the P:I ratio definitively.