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They contain a remarkable range of domains and module types that introduce different substituents into growing polyketide chains. As one such modification, we recently reported Baeyer\u2013Villiger\u2010type oxygen insertion into nascent polyketide backbones, thereby generating malonyl thioester intermediates. In this work, genome mining focusing on architecturally diverse oxidation modules in\n                    <jats:italic>trans<\/jats:italic>\n                    \u2010AT PKSs led us to the culturable plant symbiont\n                    <jats:italic>Gynuella sunshinyii<\/jats:italic>\n                    , which harbors two distinct modules in one orphan PKS. The PKS product was revealed to be lobatamide A, a potent cytotoxin previously only known from a marine tunicate. Biochemical studies show that one module generates glycolyl thioester intermediates, while the other is proposed to be involved in oxime formation. The data suggest varied roles of oxygenation modules in the biosynthesis of polyketide scaffolds and support the importance of\n                    <jats:italic>trans<\/jats:italic>\n                    \u2010AT PKSs in the specialized metabolism of symbiotic bacteria.\n                  <\/jats:p>","DOI":"10.1002\/anie.201916005","type":"journal-article","created":{"date-parts":[[2020,2,10]],"date-time":"2020-02-10T08:31:56Z","timestamp":1581323516000},"page":"7761-7765","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["Genome Mining of Oxidation Modules in\n                    <i>trans<\/i>\n                    \u2010Acyltransferase Polyketide Synthases Reveals a Culturable Source for Lobatamides"],"prefix":"10.1002","volume":"59","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1350-6652","authenticated-orcid":false,"given":"Reiko","family":"Ueoka","sequence":"first","affiliation":[{"name":"Institute of 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