7SFP
Crystal structure of OssO, a spirocyclase involved in the biosynthesis of ossamycin
Summary for 7SFP
| Entry DOI | 10.2210/pdb7sfp/pdb |
| Descriptor | Spirocyclase (2 entities in total) |
| Functional Keywords | cyclase, spyrocyclase, oligomycin, calycin, hydrolase |
| Biological source | Streptomyces ossamyceticus |
| Total number of polymer chains | 1 |
| Total formula weight | 23832.33 |
| Authors | Bilyk, O.,Leadlay, P.F.,Dias, M.V.B. (deposition date: 2021-10-04, release date: 2022-08-17, Last modification date: 2023-10-18) |
| Primary citation | Bilyk, O.,Oliveira, G.S.,de Angelo, R.M.,Almeida, M.O.,Honorio, K.M.,Leeper, F.J.,Dias, M.V.B.,Leadlay, P.F. Enzyme-Catalyzed Spiroacetal Formation in Polyketide Antibiotic Biosynthesis. J.Am.Chem.Soc., 144:14555-14563, 2022 Cited by PubMed Abstract: A key step in the biosynthesis of numerous polyketides is the stereospecific formation of a spiroacetal (spiroketal). We report here that spiroacetal formation in the biosynthesis of the macrocyclic polyketides ossamycin and oligomycin involves catalysis by a novel spiroacetal cyclase. OssO from the ossamycin biosynthetic gene cluster (BGC) is homologous to OlmO, the product of an unannotated gene from the oligomycin BGC. The deletion of abolished oligomycin production and led to the isolation of oligomycin-like metabolites lacking the spiroacetal structure. Purified OlmO catalyzed complete conversion of the major metabolite into oligomycin C. Crystal structures of OssO and OlmO reveal an unusual 10-strand β-barrel. Three conserved polar residues are clustered together in the β-barrel cavity, and site-specific mutation of any of these residues either abolished or substantially diminished OlmO activity, supporting a role for general acid/general base catalysis in spiroacetal formation. PubMed: 35921248DOI: 10.1021/jacs.2c03313 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.2 Å) |
Structure validation
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