Molecular basis of endosomal-membrane association for the dengue virus envelope protein

Rogers, David M.; Kent, Michael S.; Rempe, Susan B.

doi:10.1016/j.bbamem.2014.12.018

Title: Molecular basis of endosomal-membrane association for the dengue virus envelope protein

Journal Article · Wed Apr 01 00:00:00 EDT 2015 · Biochimica et Biophysica Acta. Biomembranes

DOI:https://doi.org/10.1016/j.bbamem.2014.12.018· OSTI ID:1242426

Rogers, David M.; Kent, Michael S.; Rempe, Susan B.

Dengue virus is coated by an icosahedral shell of 90 envelope protein dimers that convert to trimers at low pH and promote fusion of its membrane with the membrane of the host endosome. We provide the first estimates for the free energy barrier and minimum for two key steps in this process: host membrane bending and protein–membrane binding. Both are studied using complementary membrane elastic, continuum electrostatics and all-atom molecular dynamics simulations. The predicted host membrane bending required to form an initial fusion stalk presents a 22–30 kcal/mol free energy barrier according to a constrained membrane elastic model. Combined continuum and molecular dynamics results predict a 15 kcal/mol free energy decrease on binding of each trimer of dengue envelope protein to a membrane with 30% anionic phosphatidylglycerol lipid. The bending cost depends on the preferred curvature of the lipids composing the host membrane leaflets, while the free energy gained for protein binding depends on the surface charge density of the host membrane. The fusion loop of the envelope protein inserts exactly at the level of the interface between the membrane's hydrophobic and head-group regions. As a result, the methods used in this work provide a means for further characterization of the structures and free energies of protein-assisted membrane fusion.

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Research Organization:: Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1242426

Alternate ID(s):: OSTI ID: 1214661

Journal Information:: Biochimica et Biophysica Acta. Biomembranes, Journal Name: Biochimica et Biophysica Acta. Biomembranes Vol. 1848 Journal Issue: 4; ISSN 0005-2736

Publisher:: ElsevierCopyright Statement

Country of Publication:: Netherlands

Language:: English

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Cited by: 22 works

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