10 Pyruvate Dehydrogenase
Last updated
Last updated
pyruvate dehydrogenase to acetyl coa to TCA
lactate: RBC without mitochondria and muscles. Muscles release lactate to blood to go back to liver
alanine: alanine carry nitrogen to liver, extract nitrogen to urea
must enter mitochondria for gluconeogenesis and acetyl coa
1st step for gluconeogenesis in mito
outer: just a pore
once inside mito
high ATP, slow TCA, high Acetyl- coa and activates pyruvate carboxylase, preferential shunt towards gluconeogenesis
acetyl coa also inactivates pyruvate dehydrogenase
E1 adds thiamine PP to pyruvate and release CO2
E3 keeps lipoic acid in proper form
TPP active form, 2 phosphates from ATP
thiamine deficient, cannot convert pyruvate to acetyl-coa, no ATP
used in oxidative phosphorylation
first 4 all used in pyruvate dehydrogenase complexes
Ca activator in skeletal muscles when exercising
whenever pyruvate not metabolized, build up in mito and shunted towards lactate
fat converted to acetyl coa without going through pyruvate