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• W3100820074 abstract "Abstract The increasing problem of bacterial resistance to antibiotics underscores the urgent need for new antibacterials. The Sec preprotein export pathway is an attractive potential alternative target. It is essential for bacterial viability and includes components that are absent from eukaryotes. Here we used a new high throughput in vivo screen based on the secretion and activity of alkaline phosphatase (PhoA), a Sec-dependent secreted enzyme that becomes active in the periplasm. The assay was optimized for a luminescence-based substrate and was used to screen a ~240K small molecule compound library. After hit confirmation and analoging, fourteen HTS secretion inhibitors (HSI), belonging to 8 structural classes, were identified (IC 50 <60 μM). The inhibitors were also evaluated as antibacterials against 19 Gram − and Gram + bacterial species (including those from the WHO top pathogens list). Seven of them, HSI#6, 9; HSI#1, 5, 10 and HSI#12, 14 representing three structural families were microbicidals. HSI#6 was the most potent (IC 50 of 0.4-8.7 μM), against 13 species of both Gram − and Gram + bacteria. HSI#1, 5, 9 and 10 inhibited viability of Gram + bacteria with IC 50 ~6.9-77.8 μM. HSI#9, 12 and 14 inhibited viability of E. coli strains with IC 50 <65 μM. Moreover, HSI#1, 5 and 10 inhibited viability of an E. coli strain missing TolC to improve permeability with IC 50 4-14 μM, indicating their inability to penetrate the outer membrane. In vitro assays revealed that antimicrobial activity was not related to inhibition of the SecA component of the translocase and hence HSI molecules may target new unknown components that affect secretion. The results provide proof of principle for our approach, and new starting compounds for optimization." @default.
• W3100820074 created "2020-11-23" @default.
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• W3100820074 date "2020-11-17" @default.
• W3100820074 modified "2023-10-01" @default.
• W3100820074 title "Small-molecule antibiotic inhibitors of post-translational protein secretion" @default.
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• W3100820074 doi "https://doi.org/10.1101/2020.11.17.387027" @default.
• W3100820074 hasPublicationYear "2020" @default.
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