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| Title | The structure of full-length AFPK supports the ACP linker in a role that regulates iterative polyketide and fatty acid assembly. |
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| Journal, issue, pages | Proc Natl Acad Sci U S A, Vol. 122, Issue 6, Page e2419884122, Year 2025 |
| Publish date | Feb 11, 2025 |
 Authors | Heidi L Schubert / Feng Li / Christopher P Hill / Eric W Schmidt /  |
| PubMed Abstract | The polyketide synthases (PKSs) in microbes and the cytoplasmic fatty acid synthases in humans (FASs) are related enzymes that have been well studied. As a result, there is a paradigm explaining in ...The polyketide synthases (PKSs) in microbes and the cytoplasmic fatty acid synthases in humans (FASs) are related enzymes that have been well studied. As a result, there is a paradigm explaining in general terms how FASs repeatedly use a set of enzymatic domains to produce simple fats, while PKSs use the domains in a much more complex manner to produce pharmaceuticals and other elaborate molecules. However, most animals also have PKSs that do not conform to the rules described in microbes, including a large family of enzymes that bridge fatty acid and polyketide metabolism, the animal FAS-like PKSs (AFPKs). Here, we present the cryoelectron microscopy structures of two AFPKs from sea slugs. While the AFPK resemble mammalian FASs, their chemical products mimic those of PKSs in complexity. How then does the architecture of AFPKs facilitate this structural complexity? Unexpectedly, chemical complexity is controlled not solely by the enzymatic domains but is aided by the dynamics of the acyl carrier protein (ACP), a shuttle that moves intermediates between these domains. We observed interactions between enzyme domains and the linker-ACP domain, which, when manipulated, altered the kinetic properties of the enzyme to change the resulting chemical products. This unveils elaborate mechanisms and enzyme motions underlying lipid and polyketide biochemistry across the domains of life. |
 External links | Proc Natl Acad Sci U S A / PubMed:39913209 / PubMed Central |
| Methods | EM (single particle) |
| Resolution | 2.92 - 4.3 Å |
| Structure data | EMDB-45806, PDB-9cq1: EMDB-45812, PDB-9cq9: EMDB-45907, PDB-9cti: EMDB-45909, PDB-9ctk: EMDB-45910, PDB-9ctl: EMDB-45911, PDB-9ctm: EMDB-45912, PDB-9ctn: EMDB-45913, PDB-9cto: |
| Chemicals |  ChemComp-MLC:  ChemComp-NAP:  ChemComp-HOH:  ChemComp-NDP:  ChemComp-6VG: |
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 Keywords | BIOSYNTHETIC PROTEIN / polyketide adenosyl transferase / beta-keto-synthase / dehydratase / keto-redctase / Acyl carrier protein / beta-keto-synthase dehydratase / keto-reductase / polyketide adenosyl transferase beta-keto-synthase dehydratase keto-reductase Acyl carrier protein / polyketide synthase acetyltransferase ketoreductase ketosynthase dehydrogenase |
elysia chlorotica (eastern emerald elysia)