N-acetyltransferase MPR1

UniProtKB accession:  E9P8D2

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UniProtKB description:  N-acetyltransferase involved in oxidative stress resistance. Acetylates the toxic proline metabolism intermediate (S)-1-pyrroline-5-carboxylate (P5C), or more likely its spontaneously forming tautomer glutamate-5-semialdehyde (GSA) into N-acetyl-GSA for arginine synthesis in the mitochondria. P5C has been shown to increase the levels of reactive oxygen species (ROS) in the cell by inhibiting the function of the respiratory chain in the mitochondria. The enzyme is able to reduce intracellular ROS levels under P5C-induced oxidative stress and protects cells from damage by oxidative stress (PubMed:15308773, PubMed:20550582, PubMed:22698729). Also acetylates and thereby detoxifies the proline analog azetidine-2-carboxylate (AZC), however it is unlikely that AZC is a natural substrate as it occurs only in plants belonging to the Lilaceae family (PubMed:11555637). Does not acetylate proline (PubMed:11555637, PubMed:12761200).