Direct Visualization of the Conformational Dynamics of Single Influenza Hemagglutinin Trimers.
Direct Visualization of the Conformational Dynamics of Single Influenza Hemagglutinin Trimers.
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DOI:
10.1016/j.cell.2018.05.050
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发表时间:
2018-08-09
期刊:
影响因子:
64.5
通讯作者:
Munro JB
中科院分区:
文献类型:
--
作者:
Das DK;Govindan R;Nikić-Spiegel I;Krammer F;Lemke EA;Munro JB
Influenza hemagglutinin (HA) is the canonical type-I viral envelope glycoprotein, and provides a template for the membrane fusion mechanisms of numerous viruses. The current model of HA-mediated membrane fusion describes a static “spring-loaded” fusion domain (HA2) at neutral pH. Acidic pH triggers a singular irreversible conformational rearrangement in HA2 that fuses viral and cellular membranes. Here, using single-molecule Förster resonance energy transfer (smFRET) imaging we directly visualized pH-triggered conformational changes of HA trimers on the viral surface. Our analyses reveal reversible exchange between the pre-fusion and two intermediate conformations of HA2. Acidification of pH and receptor binding shift the dynamic equilibrium of HA2 in favor of forward progression along the membrane fusion reaction coordinate. Interaction with the target membrane promotes irreversible transition of HA2 to the post-fusion state. The reversibility of HA2 conformation may protect against transition to the post-fusion state prior to arrival at the target membrane. Single molecule FRET is used to provide real-time visualization of influenza hemagglutinin conformational dynamics on the viral surface during triggering by low pH.
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