The pyruvate kinase activity assay is a critical tool for measuring the enzymatic activity of pyruvate kinase (PK), an enzyme that plays a pivotal role in glycolysis. This assay typically involves the conversion of phosphoenolpyruvate (PEP) and adenosine diphosphate (ADP) into pyruvate and adenosine triphosphate (ATP).

The generated pyruvate can be quantified through colorimetric or fluorometric methods, where the intensity of the resulting signal is directly proportional to the amount of pyruvate produced.

This assay is particularly valuable in various research areas, including cancer metabolism, where altered PK activity is often observed. Additionally, it has significant clinical applications, such as diagnosing pyruvate kinase deficiency, a genetic disorder leading to hemolytic anemia due to reduced glycolytic capacity.

The assay can be performed on various sample types, including plasma, serum, and tissue extracts, making it versatile for both laboratory and clinical settings. With advancements in assay kits that allow for automation and high-throughput screening, researchers can efficiently evaluate drug effects on PK activity and explore its implications in metabolic diseases and therapeutic interventions. Overall, the pyruvate kinase activity assay is essential for understanding metabolic regulation and developing targeted treatments.