Generating polyketide diversity in Dictyostelium : a Steely hybrid polyketide synthase produces alternate products at different developmental stages
| Autor: | Tamao Saito, Tomoyuki Iijima, Kohei Koyama, Tomonori Shinagawa, Ayaka Yamanaka, Tsuyoshi Araki, Noriyuki Suzuki, Toyonobu Usuki, Robert R. Kay |
|---|---|
| Přispěvatelé: | Saito, Tamao [0000-0003-0368-4244], Kay, Robert R [0000-0001-9836-7967], Apollo - University of Cambridge Repository |
| Rok vydání: | 2022 |
| Předmět: |
General Immunology and Microbiology
Research articles antibacterial compound polyketide synthase Development and physiology dibenzofuran General Medicine Dictyostelium discoideum General Agricultural and Biological Sciences General Biochemistry Genetics and Molecular Biology differentiation-inducing factor (DIF) General Environmental Science |
| Popis: | Peer reviewed: True The soil is a rich ecosystem where many ecological interactions are mediated by small molecules, and in which amoebae are low-level predators and also prey. The social amoeba Dictyostelium discoideum has a high genomic potential for producing polyketides to mediate its ecological interactions, including the unique ‘Steely’ enzymes, consisting of a fusion between a fatty acid synthase and a chalcone synthase. We report here that D. discoideum further increases its polyketide potential by using the StlB Steely enzyme, and a downstream chlorinating enzyme, to make both a chlorinated signal molecule, DIF-1, during its multi-cellular development, and a set of abundant polyketides in terminally differentiated stalk cells. We identify one of these as a chlorinated dibenzofuran with potent anti-bacterial activity. To do this, StlB switches expression from prespore to stalk cells in late development and is cleaved to release the chalcone synthase domain. Expression of this domain alone in StlB null cells allows synthesis of the stalk-associated, chlorinated polyketides. Thus, by altered expression and processing of StlB, cells make first a signal molecule, and then abundant secondary metabolites, which we speculate help to protect the mature spores from bacterial infection. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|