Fluorescence Imaging of Viral Sialidase Activity Using a Fluorogenic Probe.

Area of Science:

• Virology
• Biochemistry
• Molecular Biology

Background:

• Influenza and paramyxoviruses possess sialidases that cleave sialic acid, a crucial viral receptor on glycans.
• Viral sialidase expression is significantly upregulated in cells infected by these viruses.

Purpose of the Study:

• To develop and characterize novel sialidase imaging probes for visualizing viral sialidase activity.
• To enable rapid, antibody-free fluorescence imaging of virus-infected cells.
• To facilitate the detection of drug-resistant influenza strains and study sialidase localization.

Main Methods:

• Synthesis of a water-soluble, non-fluorescent sialidase imaging probe incorporating sialic acid and a fluorescent moiety.
• Histochemical visualization of sialidase activity in infected cells using the developed probe.
• Application of the probe for virus isolation and detection, including drug-resistant strains.

Main Results:

• The sialidase imaging probe successfully visualized sialidase activity in infected cells.
• The probe enabled rapid fluorescence imaging without the need for antiviral antibodies or cell fixation.
• The probe demonstrated utility in detecting drug-resistant influenza viruses and characterizing sialidase localization.

Conclusions:

• Novel sialidase imaging probes provide an effective tool for visualizing viral sialidase activity.
• These probes facilitate rapid detection of infected cells and drug-resistant viral strains.
• The developed probes enhance the study of viral sialidases and their localization.