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Engineering the prion protein using chemical synthesis.

H L Ball¹, D S King, F E Cohen

¹Institute for Neurodegenerative Diseases and Department of Neurology, University of California at San Francisco, 94143-0518, USA. haydnb@itsa.ucsf.edu

The Journal of Peptide Research : Official Journal of the American Peptide Society

|March 15, 2002

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Chemical synthesis of prion proteins (PrP) is now viable, complementing recombinant methods. Researchers created synthetic PrP106, demonstrating its identical properties to recombinant versions, advancing prion disease research.

Area of Science:

Biochemistry
Protein Chemistry
Neuroscience

Background:

Prion diseases involve the misfolding of cellular prion protein (PrPc) into a pathogenic isoform (PrPSc).
Solid-phase peptide synthesis (SPPS) technology has advanced, enabling chemical protein synthesis.

Purpose of the Study:

To demonstrate the feasibility of chemically synthesizing prion protein (PrP) fragments.
To compare chemically synthesized PrP with its recombinant counterpart.
To develop methods for creating modified PrP analogs for disease research.

Main Methods:

Utilized optimized Fmoc and t-Boc solid-phase peptide synthesis methodologies.
Employed DCC/HOBt activation and HATU coupling reagents for efficient synthesis.
Incorporated lipophilic groups or biotin for surface immobilization and mimicry of GPI anchor.

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Main Results:

Successfully synthesized wild-type and modified prion protein polypeptides up to 112 residues.
Synthetic PrP106 (sPrP106) exhibited indistinguishable conformational and aggregational properties from recombinant PrP106 (rPrP106).
Chemically synthesized PrP analogs could be immobilized on surfaces, mimicking membrane-bound PrPc.

Conclusions:

Chemical synthesis is a flexible and powerful complementary strategy to recombinant expression for producing prion proteins.
Synthetic PrP analogs facilitate studies on prion protein structure, function, and disease mechanisms.
Chemical manipulation of PrP offers new avenues for understanding and potentially treating prion diseases.