J. Cell Biol.
© The Rockefeller University Press
0021-9525/97/12/1455/10 $2.00
Volume 139, Number 6, December 15, 1997 1455-1464

Activation of a Retroviral Membrane Fusion Protein: Soluble Receptor-induced Liposome Binding of the ALSV Envelope Glycoprotein

Lorraine D. Hernandez,^* Reuben J. Peters,^§ Sue E. Delos,^* John A.T. Young, David A. Agard,^§ and Judith M. White^*

^* Department of Cell Biology, University of Virginia Health Sciences Center, Charlottesville, Virginia 22908;  Department of Biochemistry and Biophysics, ^§ Howard Hughes Medical Institute, University of California, San Francisco, California 94143; and  Department of Microbiology and Molecular Genetics, Harvard Medical School, Cambridge, Massachusetts 02138

It is not known how membrane fusion proteins that function at neutral pH, for example the human immunodeficiency virus envelope (Env) glycoprotein and intracellular fusion machines, are activated for target bilayer binding. We have addressed this question using a soluble oligomeric form of an avian retroviral Env glycoprotein (API) and soluble forms of its receptor. Binding of soluble receptor to API induces API to bind to liposomes composed of phosphatidylcholine and cholesterol at neutral pH. Liposome binding only occurs at fusion permissive temperatures (T > 20°C), is complete between 2 to 5 min at 37°C, and is stable to high salt, carbonate, and urea. Liposome binding is mediated by the ectodomain of the transmembrane subunit of API, and a mutant with a Val to Glu substitution in the Env fusion peptide (located in the ectodomain of the transmembrane subunit) shows significantly reduced liposome binding. Moreover, under conditions of equivalent binding to API, a mutant receptor that does not support infection (Zingler, K., and J.A.T. Young. 1996. J. Virol. 70:7510-7516) does not induce significant liposome binding. Our results indicate that a highly specific interaction between an avian retroviral Env and its receptor activates the retroviral glycoprotein for target bilayer binding at neutral pH in much the same way as low pH activates the influenza hemagglutinin. Our findings are discussed in terms of the mechanisms of viral and cellular fusion proteins that function at neutral pH.

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