A direct radioassay for pyruvate kinase activity

Area of Science:

• Biochemistry
• Enzymology

Background:

• Pyruvate kinase is a key enzyme in glycolysis, catalyzing the final step.
• Accurate and efficient assays are crucial for studying enzyme kinetics and function.

Purpose of the Study:

• To develop a direct radioassay for pyruvate kinase activity.
• To establish a method suitable for high-throughput analysis.

Main Methods:

• Utilized [14C]phosphoenolpyruvate ([14C]PEP) as a substrate.
• Separated the product, [14C]pyruvate, from the substrate using a hydroxyapatite column.
• Collected eluent directly into scintillation vials for radioactivity measurement.

Main Results:

• Developed a sensitive and rapid radioassay for pyruvate kinase.
• Demonstrated efficient separation of [14C]pyruvate from [14C]PEP on hydroxyapatite.
• The hydroxyapatite column is regenerable for indefinite reuse.

Conclusions:

• The developed radioassay is effective for quantifying pyruvate kinase activity.
• The method is well-suited for simultaneous assay of numerous samples.
• This technique offers a robust tool for biochemical and enzymatic studies.