Related Experiment Video
Updated: Jul 2, 2026
10:12
Protein Misfolding Cyclic Amplification of Prions
Published on: November 7, 2012
Generation of Infectious Prions Amenable to Site-specific Click Chemistry
Biorxiv : the Preprint Server for Biology
|April 17, 2026
Summary
Researchers developed a novel method to study prion diseases by incorporating a click chemistry-reactive amino acid into the prion protein. This breakthrough allows for direct investigation of prion structure and function, advancing our understanding of these fatal neurodegenerative conditions.
Area of Science:
- Neurodegenerative diseases
- Protein misfolding diseases
- Biochemistry
Background:
- Prion diseases involve the conversion of normal PrPC to infectious PrPSc.
- Studying PrPSc biology is challenging due to difficulties in producing and modifying functional molecules.
- Understanding PrPSc conversion is key to disease progression.
Purpose of the Study:
- To overcome limitations in studying PrPSc biology.
- To develop a method for direct investigation of PrPSc structure and function.
- To enable targeted questions about prion infectivity.
Main Methods:
- Site-specific substitution of tryptophan residue 99 in PrPC with p-azido-L-phenylalanine (AzF).
- Utilizing click chemistry for selective modification of AzF-containing PrPC.
- In vitro propagation of infectious and non-infectious PrPSc conformers using W99AzF PrPC substrate.
Main Results:
- W99AzF PrPC successfully propagated both infectious and non-infectious PrPSc conformers in vitro.
- W99AzF PrPSc amyloid fibrils remained amenable to click chemistry after conversion.
- A multitude of modified prions were produced for targeted investigations.
Conclusions:
- The developed method enables direct study of PrPSc biology.
- Site-specific incorporation of AzF and click chemistry provides a powerful tool for prion research.
- This approach facilitates a deeper understanding of the biochemical and biological basis of prion infectivity.
Related Concept Videos
02:53Conservative Site-specific Recombination and Phase Variation
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
01:30Production of Pharmaceuticals
Industrial insulin production uses genetically engineered E. coli expressing a proinsulin gene controlled by a tryptophan promoter and containing a methionine linker for later cleavage. The cells also carry ampicillin resistance for selective growth. Seed cultures are stored at −80 °C and production begins by thawing a small amount to inoculate starter cultures, which are progressively scaled to a 50,000-L bioreactor. In the bioreactor, E. coli grow in nutrient-rich media under sterile, tightly...