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- W2890075254 abstract "Abstract The pneumococcal surface antigen A (PsaA) metal transporter protein provides manganese to bacterial cells. The X‐ray crystal structures of PsaA, in both closed (Mn bound) and open (metal free) conformations, were explored with virtual screening to identify potential inhibitors of manganese transport. We pursued three strategies for inhibition: i) targeting a cavity close to the bound Mn to keep the metal in place; ii) targeting the metal‐free Mn site to prevent metal uptake; and iii) targeting a potentially druggable allosteric site involving loops that translate between the conformations. Tiered assays were used to test the resulting 170 acquired hits: i) assay 1 tested the compounds’ growth inhibition of the TIGR4 S. pneumoniae strain (ΔPsaA mutant control), yielding 80 compounds (MIC≤250 μ m ); ii) assay 2 tested if the addition of 20 μ m Mn to inhibited cell cultures restored growth, yielding 21 compounds; and iii) assay 3 confirmed that the restored bacterial growth was Mn concentration dependent, as was the restoration of ΔPsaA growth, yielding 12 compounds with MICs of 125 μ m or greater. It may be possible for a small molecule to inhibit PsaA, but we have not yet identified a compound with exemplary properties." @default.
- W2890075254 created "2018-09-27" @default.
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- W2890075254 date "2018-11-21" @default.
- W2890075254 modified "2023-09-26" @default.
- W2890075254 title "Inhibiting Pneumococcal Surface Antigen A (PsaA) with Small Molecules Discovered through Virtual Screening: Steps toward Validating a Potential Target for<i>Streptococcus pneumoniae</i>" @default.
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- W2890075254 doi "https://doi.org/10.1002/cbdv.201800234" @default.
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