Pyruvate dehydrogenase is an enzyme that converts pyruvate to acetyl- COA. Acetyl- CoA is further metabolized in the Krebs cycle. A researcher measured the accumulation of acetyl- CoA in a reaction containing pyruvate and pyruvate dehydrogenase under several different conditions. Pyruvate dehydrogenase deficiency is a genetic disease most commonly linked to a mutation in the a- subunit of the mitochondrial enzyme that causes the enzyme to cease functioning. Because of this mutation, individuals that are affected build up dangerous amounts of lactic acid How can vou exnlain the buildun of lantio

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Pyruvate dehydrogenase is an enzyme that converts pyruvate to acetyl- COA.
Acetyl- CoA is further metabolized in the Krebs cycle. A researcher measured
the accumulation of acetyl- CoA in a reaction containing pyruvate and pyruvate
dehydrogenase under several different conditions. Pyruvate dehydrogenase
deficiency is a genetic disease most commonly linked to a mutation in the a-
subunit of the mitochondrial enzyme that causes the enzyme to cease
functioning. Because of this mutation, individuals that are affected build up
dangerous amounts of lactic acid. How can you explain the buildup of lactic acid
when someone has this mutation? *
70T
60-
50-
40
30
20
Acetyl-CoA
micromoles)
Transcribed Image Text:Pyruvate dehydrogenase is an enzyme that converts pyruvate to acetyl- COA. Acetyl- CoA is further metabolized in the Krebs cycle. A researcher measured the accumulation of acetyl- CoA in a reaction containing pyruvate and pyruvate dehydrogenase under several different conditions. Pyruvate dehydrogenase deficiency is a genetic disease most commonly linked to a mutation in the a- subunit of the mitochondrial enzyme that causes the enzyme to cease functioning. Because of this mutation, individuals that are affected build up dangerous amounts of lactic acid. How can you explain the buildup of lactic acid when someone has this mutation? * 70T 60- 50- 40 30 20 Acetyl-CoA micromoles)
Condition 1
Condition 2
Condition 3
Figure 1. Accumulation of acetyl-CoA under different conditions
O Cells undergo glycolysis because there is a buildup of pyruvate in affected individuals.
Cells undergo fermentation because pyruvate cannot be metabolized to proceed into
the Krebs cycle.
Cells use lactic acid to shunt electrons from pyruvate to the electron transport chain
in the mitochondria.
Cells cannot transport pyruvate to the mitochondria in the absence of pyruvate
dehydrogenase activity, so the pyruvate is broken down to lactic acid and ethanol.
following auestions can best be answered by the diagram?
Transcribed Image Text:Condition 1 Condition 2 Condition 3 Figure 1. Accumulation of acetyl-CoA under different conditions O Cells undergo glycolysis because there is a buildup of pyruvate in affected individuals. Cells undergo fermentation because pyruvate cannot be metabolized to proceed into the Krebs cycle. Cells use lactic acid to shunt electrons from pyruvate to the electron transport chain in the mitochondria. Cells cannot transport pyruvate to the mitochondria in the absence of pyruvate dehydrogenase activity, so the pyruvate is broken down to lactic acid and ethanol. following auestions can best be answered by the diagram?
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