Citation

Meier JL, Haushalter RW, Burkart MD. Bioorg. Med. Chem. Lett. 2010; 20(16): 4936-4939.

Copyright

(Copyright © 2010, Elsevier Publishing)

DOI

10.1016/j.bmcl.2010.06.028

PMID

20620055

PMCID

PMC2956584

Abstract

Recent advances in the structural study of fatty acid synthase (FAS) and polyketide synthase (PKS) biosynthetic enzymes have illuminated our understanding of modular enzymes of the acetate pathway. However, one significant and persistent challenge in such analyses is resolution of the acyl carrier protein (ACP), a small (approximately 9 kDa) protein to which biosynthetic intermediates are tethered throughout the biosynthetic cycle. Here we report a chemoenzymatic crosslinking strategy in which the installation of a historical suicide substrate scaffold upon the 4'-phosphopantetheine (PPant) arm of the ACP is used to capture the active site of acyl carrier protein dehydratase (DH) domains in FAS. Through the synthesis of a small panel of related probes we identify structural features essential for ACP-DH crosslinking, and apply gel-based assays to demonstrate the stability as well as purification strategies for isolation of the chemoenzymatically modified ACP. Applying these carrier protein crosslinking techniques to the structural analysis of FAS and PKS complexes has the potential to provide snapshots of these biosynthetic assembly lines at work.

Language: en

Keywords

Hydro-Lyases; Nuclear Magnetic Resonance, Biomolecular; Protein Binding; Protein Structure, Tertiary; Cross-Linking Reagents; Fatty Acid Synthases; Polyketide Synthases