Interaction between Prion Protein's Copper-Bound Octarepeat Domain and a Charged C-Terminal Pocket Suggests a Mechanism for N-Terminal Regulation.
Structure
; 24(7): 1057-67, 2016 07 06.
Article
em En
| MEDLINE
| ID: mdl-27265848
ABSTRACT
Copper plays a critical role in prion protein (PrP) physiology. Cu(2+) binds with high affinity to the PrP N-terminal octarepeat (OR) domain, and intracellular copper promotes PrP expression. The molecular details of copper coordination within the OR are now well characterized. Here we examine how Cu(2+) influences the interaction between the PrP N-terminal domain and the C-terminal globular domain. Using nuclear magnetic resonance and copper-nitroxide pulsed double electron-electron resonance, with molecular dynamics refinement, we localize the position of Cu(2+) in its high-affinity OR-bound state. Our results reveal an interdomain cis interaction that is stabilized by a conserved, negatively charged pocket of the globular domain. Interestingly, this interaction surface overlaps an epitope recognized by the POM1 antibody, the binding of which drives rapid cerebellar degeneration mediated by the PrP N terminus. The resulting structure suggests that the globular domain regulates the N-terminal domain by binding the Cu(2+)-occupied OR within a complementary pocket.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Cobre
/
Proteínas Priônicas
Idioma:
En
Revista:
Structure
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Estados Unidos