The metabolism of proline begins like glutamic acid reacting with acetyl-CoA through a amino-acid acetyltransferase resulting in the release of coenzyme A, hydrogen ion and a N-acetyl-L-glutamate. The latter reacts with an ATP through acetylglutamate kinase resulting in the release of ADP and N-acetylglutamyl-phosphate. The latter then reacts with an NADPH and a Hydrogen ion through a n-acetyl-gamma-glutamyl-phosphate reductase resulting in the release of phosphate, NADP and N-acetyl-L-glutamate 5-semialdehyde. The latter compound reacts with L-glutamate through an acetylornithine transaminase resulting in the release of oxoglutaric acid and N-acetyl-L-ornithine. The latter reacts with Water through a acetylornithine deacetylase resulting in the release of acetate and L-ornithine. Ornithine can also be produced by the acetyl cycle. The acetyl cycle starts with N-acetylglutamic acid being phosphorylated through an acetylglutamate kinase resulting in the release of ADP and N-acetylglutamyl-phosphate. The latter compound reacts with NADPH and a hydrogen ion through a N-acetyl-gamma-glutamyl-phosphate reductase resulting in the release of a phosphate, NADP and N-acetyl-L-glutamic 5-semialdehyde. The latter reacts with L-glutamate through an acetyl ornithine transaminase resulting in the release of oxoglutaric acid and N-acetylornithine. The latter compound reacts with L-glutamic acid resulting in the release of L-ornithine and N-acetylglutamate. The latter compound starts the cycle over again. Ornithine reacts with carbomoyl phosphate through an OTC resulting in the release of phosphate, hydrogen ion and L-citrulline. The latter compound reacts with ATP, and L-aspartate through a argininosuccinate synthase resulting in the release of AMP, diphosphate, hydrogen ion and L-arginino-succinate. The latter compound reacts with argininosuccinate lyase resulting in the release of fumarate and l-arginine. Arginine eacts with water through arginase resulting in the release of urea and l-ornithine. Ornithine reacts with oxoglutaric acid through an ornithine aminotransferase resulting in the release of glutamic acid and l-glutamate 5- semialdehyde react with pyrroline 5 carboxylate dehydrogenase resulting in the release of glutamic acid.Arginine reacts with water through arginase resulting in the release of urea and l-ornithine. Ornithine reacts with oxoglutaric acid through an ornithine aminotransferase resulting in the release of glutamic acid and l-glutamate 5- semialdehyde which can spontaneously react to produce S-pyrroline-5-carboxylate. The latter reacts with pyrroline 5-carboxylate reductase resulting in the release of proline. Proline is degraded by reacting with a proline dehydrogenase resulting in the release of S-1-pyrroline 5-carboxylate. The latter is then spontaneously reacts with water and hydrogen ion resulting in the release of L-glutamate-5-semialdehyde. The latter compoundreacts with NAD and water through a 1-pyrroline-5-carboxylate dehydrogenase resulting in the release of 2 hydrogen ions, NADH and L-glutamic acid.

Proline Metabolism References