Related Experiment Videos
Parvovirus B19 does not bind to membrane-associated globoside in vitro.
Bärbel Kaufmann1, Ulrich Baxa, Paul R Chipman
1Department of Biological Sciences, Purdue University, 915 W. State Street, West Lafayette, IN 47907-2054, USA. bkaufman@purdue.edu
Virology
|January 22, 2005
Summary
Globoside (Gb4Cer) is not the sole cellular receptor for human parvovirus B19. Further research is needed to understand the complex interactions involved in B19 virus tropism.
Area of Science:
- Virology
- Biochemistry
- Structural Biology
Background:
- Globoside (globotetraosylceramide, Gb4Cer) has been implicated as the cellular receptor for human parvovirus B19.
- Understanding the virus-receptor interaction is crucial for elucidating parvovirus B19 tropism.
Purpose of the Study:
- To quantitatively measure the binding of human parvovirus B19 to globoside (Gb4Cer).
- To explore the molecular basis of parvovirus B19 tropism by investigating the virus-Gb4Cer interaction.
Main Methods:
- Solid-phase assays using fluorescence-labeled liposomes and 125iodine-labeled empty capsids.
- Surface plasmon resonance on lipid layers for real-time binding analysis.
- Isothermal titration microcalorimetry to characterize virus-receptor interactions.
- Cryo-electron microscopy image reconstructions at 10 Å resolution.
Main Results:
- Quantitative binding assays did not confirm the interaction between recombinant B19 VP2 capsids and Gb4Cer.
- Structural analysis via cryo-electron microscopy showed no significant interaction between capsids and Gb4Cer.
- These findings suggest Gb4Cer alone is not the cellular receptor for parvovirus B19.
Conclusions:
- Globoside (Gb4Cer) does not appear to function independently as the cellular receptor for human parvovirus B19.
- Parvovirus B19 tropism may involve a more complex recognition mechanism than previously thought, potentially including Gb4Cer in a larger molecular complex.