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Biochemistry. 2009 Apr 14;48(14):3068-77. doi: 10.1021/bi900167q.

Uridine-based inhibitors as new leads for antibiotics targeting Escherichia coli LpxC.

Author information

1
Department of Biochemistry, Duke University Medical Center, Durham, North Carolina 27710, USA.

Erratum in

  • Biochemistry. 2009 Aug 18;48(32):7776. Hangauer, Matthew J [added].

Abstract

The UDP-3-O-(R-3-hydroxyacyl)-N-acetylglucosamine deacetylase LpxC catalyzes the committed reaction of lipid A (endotoxin) biosynthesis in Gram-negative bacteria and is a validated antibiotic target. Although several previously described compounds bind to the unique acyl chain binding passage of LpxC with high affinity, strategies to target the enzyme's UDP-binding site have not been reported. Here the identification of a series of uridine-based LpxC inhibitors is presented. The most potent examined, 1-68A, is a pH-dependent, two-step, covalent inhibitor of Escherichia coli LpxC that competes with UDP to bind the enzyme in the first step of inhibition. Compound 1-68A exhibits a K(I) of 54 muM and a maximal rate of inactivation (k(inact)) of 1.7 min(-1) at pH 7.4. Dithiothreitol, glutathione and the C207A mutant of E. coli LpxC prevent the formation of a covalent complex by 1-68A, suggesting a role for Cys-207 in inhibition. The inhibitory activity of 1-68A and a panel of synthetic analogues identified moieties necessary for inhibition. 1-68A and a 2-dehydroxy analogue, 1-68Aa, inhibit several purified LpxC orthologues. These compounds may provide new scaffolds for extension of existing LpxC-inhibiting antibiotics to target the UDP binding pocket.

PMID:
19256534
PMCID:
PMC2709817
DOI:
10.1021/bi900167q
[Indexed for MEDLINE]
Free PMC Article

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