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We describe cryo-electron microscopic studies of the interaction between the ectodomain of the trimeric HIV-1 envelope glycoprotein (Env) and Z13e1, a broadly neutralizing antibody that targets the membrane-proximal external region (MPER) of the gp41 subunit. We show that Z13e1-bound Env displays an open quaternary conformation similar to the CD4-bound conformation. Our results support the idea that MPER-directed antibodies, such as Z13e1, block viral entry by interacting with Env at a step after CD4 activation.

journal of virology

HIV-1 Envelope Glycoprotein Trimers Display Open Quaternary Conformation When Bound to the gp41 Membrane-Proximal External-Region-Directed Broadly Neutralizing Antibody Z13e1