Download MendeleyStructural Basis of Polyketide Synthase O-Methylation.
Skiba, M.A., Bivins, M.M., Schultz, J.R., Bernard, S.M., Fiers, W.D., Dan, Q., Kulkarni, S., Wipf, P., Gerwick, W.H., Sherman, D.H., Aldrich, C.C., Smith, J.L.(2018) ACS Chem Biol 13: 3221-3228
- PubMed: 30489068
- DOI: https://doi.org/10.1021/acschembio.8b00687
- Primary Citation of Related Structures:
6ECT, 6ECU, 6ECV, 6ECW, 6ECX - PubMed Abstract:
Modular type I polyketide synthases (PKSs) produce some of the most chemically complex metabolites in nature through a series of multienzyme modules. Each module contains a variety of catalytic domains to selectively tailor the growing molecule. PKS O-methyltransferases ( O-MTs) are predicted to methylate β-hydroxyl or β-keto groups, but their activity and structure have not been reported. We determined the domain boundaries and characterized the catalytic activity and structure of the StiD and StiE O-MTs, which methylate opposite β-hydroxyl stereocenters in the myxobacterial stigmatellin biosynthetic pathway. Substrate stereospecificity was demonstrated for the StiD O-MT. Key catalytic residues were identified in the crystal structures and investigated in StiE O-MT via site-directed mutagenesis and further validated with the cyanobacterial CurL O-MT from the curacin biosynthetic pathway. Initial structural and biochemical analysis of PKS O-MTs supplies a new chemoenzymatic tool, with the unique ability to selectively modify hydroxyl groups during polyketide biosynthesis.
Organizational Affiliation:
Life Sciences Institute , University of Michigan , Ann Arbor , Michigan 48109 , United States.
