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They offer promising biological activity against pathogenic fungi and gram-positive bacteria. Admittedly, production titers are very low, and pamamycins are typically formed as crude mixture of mainly smaller derivatives, leaving larger derivatives rather unexplored so far. Therefore, strategies that enable a more efficient production of pamamycins and provide increased fractions of the rare large derivatives are highly desired. Here we took a systems biology approach, integrating transcription profiling by RNA sequencing and intracellular metabolite analysis, to enhance pamamycin production in the heterologous host <jats:italic>S. albus<\/jats:italic> J1074\/R2.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Supplemented with <jats:sc>l<\/jats:sc>-valine, the recombinant producer\u00a0S. albus J1074\/R2 achieved a threefold increased pamamycin titer of 3.5\u00a0mg L<jats:sup>\u22121<\/jats:sup> and elevated fractions of larger derivatives: Pam 649 was strongly increased, and Pam 663 was newly formed. These beneficial effects were driven by increased availability of intracellular CoA thioesters, the building blocks for the polyketide, resulting from<jats:sc> l<\/jats:sc>-valine catabolism. Unfavorably, <jats:sc>l<\/jats:sc>-valine impaired growth of the strain, repressed genes of mannitol uptake and glycolysis, and suppressed pamamycin formation, despite the biosynthetic gene cluster was transcriptionally\u00a0activated, restricting production to the post <jats:sc>l<\/jats:sc>-valine phase. A deletion mutant of the transcriptional regulator <jats:italic>bkdR,<\/jats:italic> controlling a branched-chain amino acid dehydrogenase complex, revealed decoupled pamamycin biosynthesis. The regulator mutant accumulated the polyketide independent of the nutrient status. Supplemented with <jats:sc>l<\/jats:sc>-valine, the novel strain enabled the biosynthesis of pamamycin mixtures with up to 55% of the heavy derivatives Pam 635, Pam 649, and Pam 663:\u00a0almost 20-fold more than the wild type.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>Our findings open the door to provide rare heavy pamamycins at markedly increased efficiency and facilitate studies to assess their specific biological activities and explore this important polyketide further.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12934-021-01602-6","type":"journal-article","created":{"date-parts":[[2021,6,3]],"date-time":"2021-06-03T12:04:21Z","timestamp":1622721861000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Superior production of heavy pamamycin derivatives using a bkdR deletion mutant of Streptomyces albus J1074\/R2"],"prefix":"10.1186","volume":"20","author":[{"given":"Lars","family":"Gl\u00e4ser","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martin","family":"Kuhl","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julian","family":"Stegm\u00fcller","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christian","family":"R\u00fcckert","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maksym","family":"Myronovskyi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J\u00f6rn","family":"Kalinowski","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andriy","family":"Luzhetskyy","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7952-985X","authenticated-orcid":false,"given":"Christoph","family":"Wittmann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,6,3]]},"reference":[{"key":"1602_CR1","doi-asserted-by":"publisher","first-page":"673","DOI":"10.7164\/antibiotics.32.673","volume":"32","author":"PA McCann","year":"1979","unstructured":"McCann PA, Pogell BM. 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