The pyruvate dehydrogenase complex catalyzes the oxidative decarboxylation of pyruvate to form acetyl‑CoA. E 1 , E 2 , and E 3 are abbreviations for the enzymes of the complex. Classify the enzyme names, prosthetic groups, and reactions as E 1 , E 2 , or E 3 .

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11-12-2019
Biology

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The pyruvate dehydrogenase complex catalyzes the oxidative decarboxylation of pyruvate to form acetyl‑CoA. E 1 , E 2 , and E 3 are abbreviations for the enzymes of the complex. Classify the enzyme names, prosthetic groups, and reactions as E 1 , E 2 , or E 3 .

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sholadaniel1 sholadaniel1 · Answer 1 · 2019-12-11T07:54:24+01:00

Answer:

E1: Pyruvate dehydrogenase, TPP, oxidative decarboxylation reaction

E2: Dihydrolipoyl transacetylase, Lipoamide and Co-enzyme A, transacetylation reaction.

E3: Dihydrolipoyl dehydrogenase, FAD and NAD+, oxidation reaction

Explanation:

Pyruvate dehydrogenase is a multi-enzyme complex with 5 co-enzymes and 3 apo-enzymes:

Pyruvate dehydrogenase (E1) , which uses thiamine pyrophosphate (TPP) as as co-enzymes to catalyze oxidative decarboxylation of pyruvate to hydroxyethyl-TPP.

Dihydrolipoyl transacetylase (E2): which uses lipoamide and coenzyme A as co-enzymes to catalyse the transacetylation from TPP to Lipoamide to form acetyl lipoamide.

Dihydrolipoyl dehydrogenase (E3) which uses FAD and NAD+ as co-enzymes to catalyze the oxidation of lipoamide

luisvaschetto luisvaschetto · Answer 2 · 2022-04-05T13:48:34+02:00

E1 is pyruvate dehydrogenase and catalyzes oxidative decarboxylation, whereas E2 is dihydrolipoyl trans-acetylase and catalyzes the acetyl transfer to coenzyme A (CoA).

What is pyruvate dehydrogenase?

The pyruvate dehydrogenase is an enzyme, which is part of a multienzyme complex involved in catalyzing the decarboxylation of pyruvate to CoA.

E2 is a well-known dihydrolipoyl trans-acetylase enzyme that catalyzes the acetyl transfer to coenzyme A (CoA).

Finally, E3 is the dihydrolipoyl dehydrogenase enzyme and catalyzes the oxidation reaction.

In conclusion, E1 is pyruvate dehydrogenase and catalyzes oxidative decarboxylation, whereas E2 is dihydrolipoyl trans-acetylase and catalyzes the acetyl transfer to coenzyme A (CoA).

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