Identification of a Homology-independent Linchpin Domain Controlling Mouse and Bank Vole Prion Protein Conversion

Overview

Journal PLoS Pathog

Specialty Microbiology

Date 2020 Sep 8

PMID 32898162

Citations 6

Authors

Cassandra M Burke

Kenneth M K Mark

Daniel J Walsh

Geoffrey P Noble

Alexander D Steele

Abigail B Diack

Jean C Manson

Joel C Watts

Surachai Supattapone

Affiliations

Soon will be listed here.

Abstract

Prions are unorthodox pathogens that cause fatal neurodegenerative diseases in humans and other mammals. Prion propagation occurs through the self-templating of the pathogenic conformer PrPSc, onto the cell-expressed conformer, PrPC. Here we study the conversion of PrPC to PrPSc using a recombinant mouse PrPSc conformer (mouse protein-only recPrPSc) as a unique tool that can convert bank vole but not mouse PrPC substrates in vitro. Thus, its templating ability is not dependent on sequence homology with the substrate. In the present study, we used chimeric bank vole/mouse PrPC substrates to systematically determine the domain that allows for conversion by Mo protein-only recPrPSc. Our results show that that either the presence of the bank vole amino acid residues E227 and S230 or the absence of the second N-linked glycan are sufficient to allow PrPC substrates to be converted by Mo protein-only recPrPSc and several native infectious prion strains. We propose that residues 227 and 230 and the second glycan are part of a C-terminal domain that acts as a linchpin for bank vole and mouse prion conversion.

Citing Articles

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