title: Maturation of the Gag core decreases the stability of retroviral lipid membranes.
abstract: To better understand how detergents disrupt enveloped viruses, we monitored the biophysical stability of murine leukemia virus (MLV) virus-like particles (VLPs) against a panel of commonly used detergents using real-time biosensor measurements. Although exposure to many detergents, such as Triton X-100 and Empigen, results in lysis of VLP membranes, VLPs appeared resistant to complete membrane lysis by a significant number of detergents, including Tween 20, Tween 80, Lubrol, and Saponin. VLPs maintained their structural integrity after exposure to Tween 20 at concentrations up to 500-fold above its CMC. Remarkably, VLPs containing immature cores composed of unprocessed (uncleaved) Gag polyprotein were significantly more resistant to detergent lysis than VLPs with mature cores. Although the maturity of retroviral Gag is known to influence the stability of the protein core structure itself, our studies suggest that the maturity of the Gag core also influences the stability of the lipid bilayer surrounding the core.
authors.affiliation: Integral Molecular, Inc., Philadelphia, PA 19104, United States.
authors.forename: Candice
authors.initials: C
authors.lastname: Davidoff
authors.forename: Riley J
authors.initials: RJ
authors.lastname: Payne
authors.forename: Sharon H
authors.initials: SH
authors.lastname: Willis
authors.forename: Benjamin J
authors.initials: BJ
authors.lastname: Doranz
authors.forename: Joseph B
authors.initials: JB
authors.lastname: Rucker
mesh_terms: D000818:Animals; D055592:Biophysical Phenomena; D015374:Biosensing Techniques; D003902:Detergents; D015683:Gene Products, gag / Q000737:chemistry* / Q000378:metabolism; D057809:HEK293 Cells; D006801:Humans; D009052:Leukemia Virus, Murine / Q000737:chemistry* / Q000502:physiology*; D008051:Lipid Bilayers / Q000737:chemistry; D008563:Membrane Lipids / Q000737:chemistry*; D051379:Mice; D017830:Octoxynol; D011499:Protein Processing, Post-Translational; D057074:Virus Release / Q000502:physiology
chemical_list: D003902:Detergents; D015683:Gene Products, gag; D008051:Lipid Bilayers; D008563:Membrane Lipids; D017830:Octoxynol