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Influenza virus-model membrane interaction. A morphological approach using modern cryotechniques
K N Burger1, G Knoll, A J Verkleij
1Institute of Molecular Biology and Medical Biotechnology, University of Utrecht, The Netherlands.
Biochimica Et Biophysica Acta
|March 22, 1988
Summary
Influenza B virus membrane fusion is minimal at neutral pH but highly active at low pH. Morphological and biochemical studies reveal a local point fusion mechanism, followed by lipid mixing and viral content release.
Area of Science:
- Virology
- Membrane Biology
- Biophysics
Background:
- Influenza virus entry into host cells is a critical step mediated by membrane fusion.
- Understanding the precise mechanism of viral membrane fusion is essential for developing antiviral strategies.
Purpose of the Study:
- To morphologically and biochemically characterize the membrane fusion activity of influenza B virus.
- To elucidate the mechanism of influenza virus-induced membrane fusion using a model system.
Main Methods:
- Utilized electron microscopy (freeze-fracture, freeze-substitution-thin sectioning) for high-resolution morphological analysis.
- Employed a fluorescence-based lipid mixing assay for biochemical characterization of fusion.
- Used a model system of purified influenza B virus and ganglioside-containing liposomes.
Main Results:
- Demonstrated negligible membrane fusion activity at neutral pH and significant fusion activity at low pH.
- Morphological data indicated a local point contact at neutral pH and a local point fusion mechanism at low pH.
- Biochemical and morphological findings were consistent, showing fusion followed by lipid mixing and viral content exposure.
Conclusions:
- Influenza B virus membrane fusion is pH-dependent, requiring acidic conditions for efficient activity.
- The fusion process initiates via a local point mechanism, leading to subsequent lipid mixing and viral content release into the liposome.