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Publication Abstract from PubMed

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 A 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 muM) and inhibit its activity (IC50 = 5.1 +/- 1.1 muM). 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.

Peptide Inhibitors of the Escherichia coli DsbA Oxidative Machinery Essential for Bacterial Virulence.,Duprez W, Premkumar L, Halili MA, Lindahl F, Reid RC, Fairlie DP, Martin JL J Med Chem. 2014 Dec 18. PMID:25470204^[3]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.