Coupled-enzyme system for measuring viral neuraminidase activity

Area of Science:

• Biochemistry
• Enzymology
• Virology

Background:

• Viral neuraminidase is a key target for antiviral drugs.
• Accurate and efficient assays are needed to measure neuraminidase activity.
• Existing methods can be complex and time-consuming.

Purpose of the Study:

• To describe a novel coupled-enzyme assay for determining viral neuraminidase activity.
• To provide a simpler, single-step alternative to existing assays.

Main Methods:

• A coupled-enzyme system was designed involving viral neuraminidase, fetuin, N-acetylneuraminic acid aldolase, lactic acid dehydrogenase, and reduced nicotinamide adenine dinucleotide.
• All reactants were combined in a single cuvette.
• Neuraminidase activity was measured by monitoring the oxidation of reduced nicotinamide adenine dinucleotide at 340 nm.

Main Results:

• The assay successfully coupled neuraminidase activity to the oxidation of reduced nicotinamide adenine dinucleotide.
• The rate of absorbance change at 340 nm directly correlated with neuraminidase activity.
• The method provides a quantitative measure of N-acetylneuraminic acid release.

Conclusions:

• The described coupled-enzyme assay is an efficient and straightforward method for measuring viral neuraminidase activity.
• This assay serves as a valuable alternative to multistep colorimetric determinations.
• The assay's simplicity and single-step nature facilitate rapid assessment of neuraminidase function.