Document Report Card

ID: ALA3396965

Journal: J Med Chem

Title: Peptide inhibitors of the Escherichia coli DsbA oxidative machinery essential for bacterial virulence.

Authors: Duprez W, Premkumar L, Halili MA, Lindahl F, Reid RC, Fairlie DP, Martin JL.

Abstract: One approach to address antibiotic resistance is to develop drugs that interfere with bacterial virulence. A master regulator of virulence in Gram-negative bacteria is the oxidative folding machinery comprising DsbA and DsbB. A crystal structure at 2.5 Å resolution is reported here for Escherichia coli DsbA complexed with PFATCDS, a heptapeptide derived from the partner protein Escherichia coli DsbB. Details of the peptide binding mode and binding site provide valuable clues for inhibitor design. Structure-activity relationships for 30 analogues were used to produce short peptides with a cysteine that bind tightly to EcDsbA (Kd = 2.0 ± 0.3 μM) and inhibit its activity (IC50 = 5.1 ± 1.1 μM). The most potent inhibitor does not bind to or inhibit human thioredoxin that shares a similar active site. This finding suggests that small molecule inhibitors can be designed to exploit a key interaction of EcDsbA, as the basis for antivirulence agents with a novel mechanism of action.

CiteXplore: 25470204

DOI: 10.1021/jm500955s