In the case of the removal of the carboxyl group also can occur in an oxidative and non-oxidative manner.

Oxidative decarboxylation

The enzyme which is capable of removing the carboxyl group in an oxidative way: α-keto acid dehydrogenase enzyme complex (KDC). The end product

Three mitochondrial complexes belong to this family:

  1. pyruvate dehydrogenase complex (PDC),
  2. α-KG dehydrogenase complex, and
  3. branched-chain

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