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DOI: 10.1371/journal.ppat.1003973
Zitationen: 13
Web of Science
Zitationen: 13

Structure of the Membrane Anchor of Pestivirus Glycoprotein Erns, a Long Tilted Amphipathic Helix

Aberle, D.; Muhle-Goll, C.; Bürck, J.; Wolf, M.; Reißer, S.; Luy, B.; Wenzel, W.; Ulrich, A.S.; Meyers, G.

Erns is an essential virion glycoprotein with RNase activity that suppresses host cellular innate immune responses upon being partially secreted from the infected cells. Its unusual C-terminus plays multiple roles, as the amphiphilic helix acts as a membrane anchor, as a signal peptidase cleavage site, and as a retention/secretion signal. We analyzed the structure and membrane binding properties of this sequence to gain a better understanding of the underlying mechanisms. CD spectroscopy in different setups, as well as Monte Carlo and molecular dynamics simulations confirmed the helical folding and showed that the helix is accommodated in the amphiphilic region of the lipid bilayer with a slight tilt rather than lying parallel to the surface. This model was confirmed by NMR analyses that also identified a central stretch of 15 residues within the helix that is fully shielded from the aqueous layer, which is C-terminally followed by a putative hairpin structure. These findings explain the strong membrane binding of the protein and provide clues to establishing the Erns membrane contact, processing and secretion.

Zugehörige Institution(en) am KIT Institut für Biologische Grenzflächen (IBG)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2014
Sprache Englisch
Identifikator ISSN: 1553-7366, 1553-7374
URN: urn:nbn:de:swb:90-492456
KITopen ID: 1000049245
HGF-Programm 47.02.02; LK 01
Erschienen in PLoS pathogens
Band 10
Heft 2
Seiten Art. Nr.: e1003973
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