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Pyruvate

From Bioblast


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Pyruvate

Description

Pyruvic acid

Pyruvic acid, C3H4O3, is an alpha-keto monocarboxylic acid which occurs under physiological conditions mainly as the anion pyruvate-, P, with pKa = 2.5. Pyruvate is formed in glycolysis from phosphoenolpyruvate. In the cytosol, pyruvate is a substrate of lactate dehydrogenase. Pyruvate enters the mitochondrial matrix via a specific low Km' H+/monocarboxylate cotransporter known as the pyruvate carrier. In the mt-matrix the oxidative decarboxylation of pyruvate is catalyzed by pyruvate dehydrogenase and yields acetyl-CoA. Pyruvate competitively reverses the inhibition of cytochrome c oxidase by cyanide. Pyruvate is an antioxidant reacting with hydrogen peroxide.

Abbreviation: P

Reference: Gnaiger 2014 MitoPathways, MiPNet09.12



MitoPedia topics: Substrate and metabolite 

Application in HRR

P: Pyruvate (pyruvic acid, sodium salt, C3H3O3Na); Sigma P 2256, 25 g, store at 4 ยฐC; FW = 110.0


Preparation of 2 M stock solution (dissolved in H2O)

Prepare fresh everyday.
1. Weigh 44 mg of pyruvic acid directyl into a 1 ml Eppendorf tube.
2. Add 0.2 ml H2O.
3. Adjust pH to 7.0.


Oxygraph-2k manual titrations MiPNet09.12 O2k-Titrations

  • Titration volume: 5 ยตl using a 25 ยตl syringe (2 ml O2k-chamber).
  • Final concentration: 5 mM.