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(A) Chemical structures of α-amanitin (127) and θ-amanitin (128). GmP450-29 is responsible for one or both oxygenations on proline and isoleucine. (B) Chemical structures of omphalotins A–I (129–137). The two P450s encoded in the omphalotin BGC are presumed for the C–N cross-link of Trp1 and consecutive oxygenations in Trp1, Val7, Ile8, and Gly9. (C) UstC-catalyzed C–S cross-link and chemical structure of ustiloxin B (140). The PTMs catalyzed by P450s are highlighted in blue.
