期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 105, 期 40, 页码 15382-15387出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0807771105
关键词
enveloped viruses; lipid bilayer; single molecule; virus entry
资金
- Harvard Medical School Department of Biological Chemistry and Molecular Pharmacology
- NIH [AI57159, AI72346]
- Medical Research Council
- Howard Hughes Medical Institute
- MRC [MC_U117512711] Funding Source: UKRI
- Medical Research Council [MC_U117512711] Funding Source: researchfish
Membrane fusion is an essential step during entry of enveloped viruses into cells. Conventional fusion assays are generally limited to observation of ensembles of multiple fusion events, confounding more detailed analysis of the sequence of the molecular steps involved. We have developed an in vitro, two-color fluorescence assay to monitor kinetics of single virus particles fusing with a target bilayer on an essentially fluid support. Analysis of lipid- and content-mixing trajectories on a particle-by-particle basis provides evidence for multiple, long-lived kinetic intermediates leading to hemifusion, followed by a single, rate-limiting step to pore formation. We interpret the series of intermediates preceding hemifusion as a result of the requirement that multiple copies of the trimeric hemagglutinin fusion protein be activated to initiate the fusion process.
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