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Virus particles and receptor interaction monitored by fluorescence spectroscopy.
Alexandra Alimova1, A Katz, Rakhi Podder
1Institute for Ultrafast Spectroscopy and Lasers, The City College of New York, NY 10031, USA.
Photochemistry and Photobiology
|April 12, 2005
Summary
Native fluorescence spectroscopy monitored virus-receptor attachment in bacteriophage phi6. Changes in tryptophan fluorescence revealed conformational shifts in viral proteins during attachment and potential disassembly.
Area of Science:
- Biophysics
- Virology
- Spectroscopy
Background:
- Bacteriophage phi6, a lipid-containing bacteriophage, interacts with specific receptors on its pseudomonad host.
- Understanding virus-receptor attachment is crucial for deciphering viral infection mechanisms.
Purpose of the Study:
- To investigate the virus-receptor attachment process of bacteriophage phi6 in situ.
- To utilize native fluorescence spectroscopy (NFS) to monitor conformational changes in viral proteins during attachment.
Main Methods:
- Native fluorescence spectroscopy (NFS) using tryptophan (trp) emission.
- In situ monitoring of bacteriophage phi6 interaction with its isolated receptor.
Main Results:
- An initial increase in tryptophan emission intensity was observed upon mixing, indicating conformational changes in viral surface proteins.
- A subsequent decrease in tryptophan emission intensity suggested potential viral protein changes during pilus disassembly.
- The cystovirus spike protein P3 was identified as responsible for receptor recognition and observed fluorescence changes.
Conclusions:
- NFS provides a kinetic view of virus-receptor attachment by detecting conformational transitions in viral proteins.
- The technique shows potential for dynamic monitoring of various stages of the virus replication cycle.
- Fluorescence spectroscopy is a valuable tool for detecting virus-host cell interactions.