Pyruvate Oxidase
Pyruvate Oxidase - Related Videos
02:29
Pyruvate Assay for Estimation of Pyruvate Levels in Cellular Fractions of Worms
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2025
This video describes a colorimetric assay for quantitatively measuring pyruvate in the cellular fractions of Caenorhabditis elegans. Utilizing the hydrogen peroxide produced from the enzymatic reaction of pyruvate oxidase with cellular pyruvate, a chromogenic dye is oxidized to produce a colored product, measured using colorimetry to determine the pyruvate concentration.
01:15
Pyruvate Oxidation
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2019
After glycolysis, the charged pyruvate molecules enter the mitochondria via active transport and undergo three enzymatic reactions. These reactions ensure that pyruvate can enter the next metabolic pathway so that energy stored in the pyruvate molecules can be harnessed by the cells. First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
10:42
Bioluminescence Imaging of NADPH Oxidase Activity in Different Animal Models
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Cited by 16 •
2012
NADPH oxidase is the major source of reactive oxygen species (ROS) in phagocytes. Because of the ephemeral nature of ROS, it is difficult to measure and monitor ROS levels in living animals. A minimally invasive method for serial quantification of ROS in living mice is described.
01:20
Fates of Pyruvate
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2025
Pyruvate is the end product of glycolysis, where glucose is oxidized to pyruvate, simultaneously reducing NAD+ to NADH. Two molecules of ATP are also produced by substrate-level phosphorylation. In aerobic organisms, pyruvate is metabolized via the citric acid cycle to produce reduced coenzymes NADH and FADH2. These coenzymes are then oxidized in the electron transport chain to produce ATP and, in the process, regenerate the NAD+ and FAD. As seen in some cell types and organisms, fermentation...
09:35
Small-Scale Colorimetric Assays of Intracellular Lactate and Pyruvate in the Nematode Caenorhabditis elegans
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Cited by 2 •
2018
We describe a modified small-scale extraction and colorimetric assays of lactate and pyruvate in the nematode C. elegans. When utilizing commercial assay kits, the technical development of their sensitivity and accuracy is important. Protein precipitation in extraction is the most critical step for the quantitative determination of intracellular metabolites.
FAQs
Inorganic phosphate and oxygen serve different roles in the reaction. Phosphate supports formation of acetyl phosphate, whereas oxygen enables the associated redox chemistry that produces hydrogen peroxide. Pyruvate consequently generates three relevant products: acetyl phosphate, carbon dioxide, and peroxide. Monitoring these products helps separate acetyl-group transfer from the oxygen-dependent reaction output.
The flavin cofactor provides an essential component of the enzyme’s redox chemistry. This is significant because the reaction does more than remove carbon dioxide from pyruvate: it also produces hydrogen peroxide when oxygen is available. In experimental systems, that peroxide formation creates a measurable signal that can connect enzyme activity with pyruvate detection.
Decarboxylation removes carbon dioxide from pyruvate while directing the remaining acetyl group toward acetyl phosphate formation. This couples a central metabolic intermediate to a transferable acetyl-containing product rather than treating carbon loss and group transfer as separate events. The coupling makes the reaction useful for examining how pyruvate utilization connects with acetyl-group chemistry.
A coupled assay can use hydrogen peroxide as the measurable output of the pyruvate oxidase reaction. Pyruvate is supplied under conditions containing inorganic phosphate and oxygen, and the resulting peroxide signal is then used to indicate reaction activity. This arrangement converts enzyme chemistry into an experimentally detectable readout without requiring direct measurement of every reaction product.
Pyruvate oxidase provides a defined enzymatic recognition reaction for biosensors because pyruvate conversion generates hydrogen peroxide. A sensor can therefore be designed around detecting the peroxide formed during the reaction. This links chemical recognition of pyruvate to a measurable signal and makes the enzyme relevant to analytical biological techniques focused on pyruvate detection.
The reaction offers a controlled way to examine bacterial pyruvate utilization, oxygen-dependent chemistry, and pathways that generate acetyl phosphate. By focusing on a defined enzymatic conversion, researchers can relate pyruvate consumption to both acetyl-group transfer and peroxide production. This provides metabolic context while preserving a clear connection between substrate use and specific reaction outputs.