Mechanism of membrane perturbation by the HIV-1 gp41 membrane-proximal external region and its modulation by cholesterol.

ABSTRACT: Membrane-activity of the glycoprotein 41 membrane-proximal external region (MPER) is required for HIV-1 membrane fusion. Consequently, its inhibition results in viral neutralization by the antibody 4E10. Previous studies suggested that MPER might act during fusion by locally perturbing the viral membrane, i.e., following a mechanism similar to that proposed for certain antimicrobial peptides. Here, we explore the molecular mechanism of how MPER permeates lipid monolayers containing cholesterol, a main component of the viral envelope, using grazing incidence X-ray diffraction and X-ray reflectivity. Our studies reveal that helical MPER forms lytic pores under conditions not affecting the lateral packing order of lipids. Moreover, we observe an increment of the surface area occupied by MPER

SUBMITTER: Ivankin A 

PROVIDER: S-EPMC8796276 | biostudies-literature | 2012 Nov

REPOSITORIES: biostudies-literature