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Solvent-dependent precipitation of prion protein
Kang Cai1, Jeanette L C Miller, Christopher J Stenland
1Department of Pathogen Safety and Research/Biological Products, Bayer Corporation, 85 T.W. Alexander Dr., Research Triangle Park, NC 27709, USA. kang.cai.b@bayer.com
Biochimica Et Biophysica Acta
|May 16, 2002
Summary
The prion protein (PrPSc) precipitation is influenced by pH, salt, and ethanol. This finding helps predict and control PrPSc removal during plasma-derived therapeutic protein purification.
Area of Science:
- Biochemistry
- Protein Chemistry
- Biopharmaceutical Manufacturing
Background:
- The misfolded prion protein isoform (PrPSc) has unique physicochemical properties.
- Differential partitioning of PrPSc during plasma-derived therapeutic protein purification is known.
- Understanding PrPSc behavior in purification is crucial for safety.
Purpose of the Study:
- Investigate solvent effects on PrPSc precipitation.
- Determine key factors driving PrPSc partitioning.
- Develop a predictive model for PrPSc removal.
Main Methods:
- Studied PrPSc precipitation under varying pH, salt, and ethanol concentrations.
- Utilized low-speed centrifugation to assess supernatant/precipitate fractions.
- Constructed an empirical mathematical model based on experimental data.
Main Results:
- PrPSc remained soluble in physiological buffer.
- Complete PrPSc precipitation occurred at pH 5, independent of salt.
- Precipitation at pH 8 with ethanol was salt-dependent.
- The developed model accurately predicted PrPSc partitioning during purification.
Conclusions:
- pH, salt, and ethanol are key determinants of PrPSc precipitation.
- The mathematical model can predict PrPSc partitioning in purification processes.
- This work aids in assessing and optimizing PrPSc removal strategies.