Publications by authors named "Emma H Kelley"

Bacteria are becoming increasingly resistant to antibiotics, therefore there is an urgent need for new classes of antibiotics to fight antibiotic resistance. Mammals do not express -acetyl-L-ornithine deacetylase (ArgE), an enzyme that is critical for bacterial survival and growth, thus ArgE represents a promising new antibiotic drug target, as inhibitors would not suffer from mechanism-based toxicity. A new ninhydrin-based assay was designed and validated that included the synthesis of the substrate analog , -di-methyl -acetyl-L-ornithine (k/K = 7.

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There is an urgent need for new antibiotics given the rise of antibiotic resistance, and succinyl-diaminopimelate desuccinylase (DapE, E.C. 3.

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Based on our previous success in using cyclobutanone derivatives as enzyme inhibitors, we have designed and prepared a 37-member library of α-aminocyclobutanone amides and sulfonamides, screened for inhibition of the bacterial enzyme diaminopimelate desuccinylase (DapE), which is a promising antibiotic target, and identified several inhibitors with micromolar inhibitory potency. Molecular docking suggests binding of the deprotonated hydrate of the strained cyclobutanone, and thermal shift analysis with the most potent inhibitor (, IC = 23.1 µM) enabled determination of a K value of 10.

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Article Synopsis
  • Growing antibiotic resistance in bacteria poses a significant global health crisis, highlighting the need for new antibiotic classes targeting specific enzymes.
  • The enzyme DapE, found exclusively in many harmful bacteria, plays a crucial role in the lysine biosynthesis pathway, essential for building bacterial cell walls.
  • Researchers synthesized a compound (N,N-dimethyl-SDAP) that was initially thought to inhibit DapE but instead acts as a substrate, allowing for improved assays to study DapE's function and behavior.
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Based on a hit from a high-throughput screen, a series of phenyltetrazole amides was synthesized and assayed for inhibitory potency against DapE from Haemophilus influenzae (HiDapE). The inhibitory potency was modest but confirmed, with the most potent analog containing an aminothiazole moiety displaying an IC = 50.2 ± 5.

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