Download MendeleyStructure-Activity Relationship Studies of the Peptide Antibiotic Clovibactin.
Brunicardi, J.E.H., Griffin, J.H., Ferracane, M.J., Kreutzer, A.G., Small, J., Mendoza, A.T., Ziller, J.W., Nowick, J.S.(2024) J Org Chem 89: 12479-12484
- PubMed: 39178334
- DOI: https://doi.org/10.1021/acs.joc.4c01414
- Primary Citation of Related Structures:
9BIC - PubMed Abstract:
Our laboratory reported the chemical synthesis and stereochemical assignment of the recently discovered peptide antibiotic clovibactin. The current paper reports an improved, gram-scale synthesis of the amino acid building block Fmoc-(2 R ,3 R )-3-hydroxyasparagine-OH that enables structure-activity relationship studies of clovibactin. An alanine scan reveals that residues Phe 1 , d-Leu 2 , Ser 4 , Leu 7 , and Leu 8 are important for antibiotic activity. The side-chain amide group of the rare d-Hyn 5 residue is not essential to activity and can be replaced with a methyl group with a moderate loss of activity. An acyclic clovibactin analogue reveals that the macrolactone ring is essential to antibiotic activity. The enantiomer of clovibactin is active, albeit somewhat less so than clovibactin. A conformationally constrained clovibactin analogue retains moderate antibiotic activity, while a backbone N -methylated analogue is almost completely inactive. X-ray crystallography of these two analogues reveals that the macrolactone ring adopts a crown-like conformation that binds anions.
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States.
Organizational Affiliation:
