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Neutron Reflectometry Studies Define Prion Protein N-terminal Peptide Membrane Binding

Le Brun, Anton P., Haigh, Cathryn L., Drew, Simon C., James, Michael, Boland, Martin P. and Collins, Steven J. (2014). Neutron Reflectometry Studies Define Prion Protein N-terminal Peptide Membrane Binding. Biophysical Journal,107(10):2313-2324.

Document type: Journal Article
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IRMA ID 84377429xPUB14
Title Neutron Reflectometry Studies Define Prion Protein N-terminal Peptide Membrane Binding
Author Le Brun, Anton P.
Haigh, Cathryn L.
Drew, Simon C.
James, Michael
Boland, Martin P.
Collins, Steven J.
Journal Name Biophysical Journal
Publication Date 2014
Volume Number 107
Issue Number 10
ISSN 0006-3495   (check CDU catalogue open catalogue search in new window)
Start Page 2313
End Page 2324
Total Pages 12
Place of Publication United States of America
Publisher Cell Press
HERDC Category C1 - Journal Article (DIISR)
Abstract The prion protein (PrP), widely recognized to misfold into the causative agent of the transmissible spongiform encephalopathies, has previously been shown to bind to lipid membranes with binding influenced by both membrane composition and pH. Aside from the misfolding events associated with prion pathogenesis, PrP can undergo various posttranslational modifications, including internal cleavage events. Alpha- and beta-cleavage of PrP produces two N-terminal fragments, N1 and N2, respectively, which interact specifically with negatively charged phospholipids at low pH. Our previous work probing N1 and N2 interactions with supported bilayers raised the possibility that the peptides could insert deeply with minimal disruption. In the current study we aimed to refine the binding parameters of these peptides with lipid bilayers. To this end, we used neutron reflectometry to define the structural details of this interaction in combination with quartz crystal microbalance interrogation. Neutron reflectometry confirmed that peptides equivalent to N1 and N2 insert into the interstitial space between the phospholipid headgroups but do not penetrate into the acyl tail region. In accord with our previous studies, interaction was stronger for the N1 fragment than for the N2, with more peptide bound per lipid. Neutron reflectometry analysis also detected lengthening of the lipid acyl tails, with a concurrent decrease in lipid area. This was most evident for the N1 peptide and suggests an induction of increased lipid order in the absence of phase transition. These observations stand in clear contrast to the findings of analogous studies of Ab and α-synuclein and thereby support the possibility of a functional role for such N-terminal fragment-membrane interactions.
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Created: Wed, 19 Aug 2015, 12:29:13 CST