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Journal of Virology, September 2005, p. 12065-12076, Vol. 79, No. 18
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.18.12065-12076.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Membrane Structures of the Hemifusion-Inducing Fusion Peptide Mutant G1S and the Fusion-Blocking Mutant G1V of Influenza Virus Hemagglutinin Suggest a Mechanism for Pore Opening in Membrane Fusion

Yinling Li, Xing Han,{dagger} Alex L. Lai, John H. Bushweller, David S. Cafiso, and Lukas K. Tamm*

Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, Virginia

Received 6 May 2005/ Accepted 21 June 2005

Influenza virus hemagglutinin (HA)-mediated membrane fusion is initiated by a conformational change that releases a V-shaped hydrophobic fusion domain, the fusion peptide, into the lipid bilayer of the target membrane. The most N-terminal residue of this domain, a glycine, is highly conserved and is particularly critical for HA function; G1S and G1V mutant HAs cause hemifusion and abolish fusion, respectively. We have determined the atomic resolution structures of the G1S and G1V mutant fusion domains in membrane environments. G1S forms a V with a disrupted "glycine edge" on its N-terminal arm and G1V adopts a slightly tilted linear helical structure in membranes. Abolishment of the kink in G1V results in reduced hydrophobic penetration of the lipid bilayer and an increased propensity to form ß-structures at the membrane surface. These results underline the functional importance of the kink in the fusion peptide and suggest a structural role for the N-terminal glycine ridge in viral membrane fusion.

* Corresponding author. Mailing address: Department of Molecular Physiology and Biological Physics, University of Virginia, Health Sciences Center, P.O. Box 800736, Charlottesville, VA 22908-0736. Phone: (434) 982-3578. Fax: (434) 982-1616. E-mail: lkt2e{at}virginia.edu.

{dagger} Present address: DuPont Haskell Laboratory for Health and Environmental Sciences, Newark, DE 19714.

Journal of Virology, September 2005, p. 12065-12076, Vol. 79, No. 18
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.18.12065-12076.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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