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Schematic presentation of the PI biosynthetic pathway in S. pristinaespiralis. Domain arrangement of the PI NRPSs SnbA, SnbC and SnbDE. Domains: A, adenylation; C, condensation; P, peptidyl carrier protein; M, methyltransferase; T, thioesterase. Amino acids: L‐HPA, l‐hydroxypicolinic acid; L‐Thr, l‐threonine; L‐Aba, l‐aminobutyric acid; L‐Pro, l‐proline; DMAPA, 4‐N,N‐dimethylamino‐l‐phenylalanine; L‐Pip, 4‐oxo‐l‐pipecolic acid; L‐Phe, l‐phenylglycine. R = CH3 (PIA), R = H (PIB).
