A close look at a ketosynthase from a trans-acyltransferase modular polyketide synthase.Gay, D.C., Gay, G., Axelrod, A.J., Jenner, M., Kohlhaas, C., Kampa, A., Oldham, N.J., Piel, J., Keatinge-Clay, A.T.
(2014) Structure 22: 444-451
- PubMed: 24508341
- DOI: https://doi.org/10.1016/j.str.2013.12.016
- Primary Citation of Related Structures:
4NA1, 4NA2, 4NA3
- PubMed Abstract:
The recently discovered trans-acyltransferase modular polyketide synthases catalyze the biosynthesis of a wide range of bioactive natural products in bacteria. Here we report the structure of the second ketosynthase from the bacillaene trans-acyltransferase polyketide synthase. This 1.95 Å resolution structure provides the highest resolution view available of a modular polyketide synthase ketosynthase and reveals a flanking subdomain that is homologous to an ordered linker in cis-acyltransferase modular polyketide synthases. The structure of the cysteine-to-serine mutant of the ketosynthase acylated by its natural substrate provides high-resolution details of how a native polyketide intermediate is bound and helps explain the basis of ketosynthase substrate specificity. The substrate range of the ketosynthase was further investigated by mass spectrometry.
Department of Chemistry, The University of Texas at Austin, 1 University Station A5300, Austin, TX 78712, USA.