Difference between revisions of "Lactate dehydrogenase"

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|11.4 <ref name="Hernandez2011"> Marín-Hernández A, Gallardo-Pérez JC, Rodríguez-Enríquez S et al (2011) Modeling cancer glycolysis. Biochim Biophys Acta 1807:755–767 ([http://dx.doi.org/10.1016/j.bbabio.2010.11.006 doi])  </ref>
 
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|HeLa cell line
 
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Revision as of 18:22, 4 March 2014

A dehydrogenase is an enzyme that transfers a hydride from one molecule to another. Lactate dehydrogenase catalyzes the conversion of pyruvate to lactate and back, as it converts NADH to NAD+ and back.

Chemical reactions

NADH + PYR \rightleftharpoons Lactate_{in} + NAD

Rate equation

 \frac{V_{mf}\frac{[NADH][PYR]}{K_{NADH} K_{PYR}} - V_{mr}\frac{[Lactate_{in}][NAD]}{K_{Lactate_{in}} K_{NAD}}}{1 + \frac{[NADH]}{K_{NADH}} + \frac{[PYR]}{K_{PYR}} + \frac{[NADH][PYR]}{K_{NADH} K_{PYR}} + \frac{[Lactate_{in}][NAD]}{K_{Lactate_{in}} K_{NAD}} + \frac{[Lactate_{in}]}{K_{Lactate_{in}}} + \frac{[PYR]}{K_{PYR}} }

Prameter values

Parameter Value Organism Remarks
V_{mf} 11.4 [1] HeLa cell line
V_{mr} 1.8[1] Rat AS-30D hepatoma
Km_{PYR} 0.1[1] HeLa cell line
Km_{LAC} 4.7[1] Rat AS-30D hepatoma
Km_{NAD} 0.07[1] HeLa cell line
Km_{NADH} 0.002[1] HeLa cell line


References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 Marín-Hernández A, Gallardo-Pérez JC, Rodríguez-Enríquez S et al (2011) Modeling cancer glycolysis. Biochim Biophys Acta 1807:755–767 (doi)