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Characterization of the phenylglycine aminotransferase PglE from Streptomyces pristinaespiralis.
Journal of Biotechnology 2018 July 21
l-phenylglycine is a rare non-proteinogenic amino acid, which only occurs in a few natural compounds, such as the streptogramin antibiotics pristinamycin I and virginiamycin S or the bicyclic peptide antibiotic dityromycin. Here we report on the biochemical characterization of the aminotransferase PglE that catalyzes the transamination from phenylglyoxylate to l-phenylglycine, which represents the final reaction step during phenylglycine biosynthesis. Enzyme assays with the purified PglE enzyme revealed that l-phenylalanine is used as an amino group donor for the transamination reaction, leading to the formation of phenylpyruvate, which may re-enter phenylglycine biosynthesis as a precursor. Based on these results, we postulate a novel l-phenylglycine biosynthetic pathway.
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