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• W4225254849 abstract "This study aimed to investigate the in vitro activities of tigecycline (TGC) and the underlying molecular mechanisms of TGC stress response and resistance in clinical Enterococcus faecalis isolates from China.Antimicrobial susceptibility and antibiofilm activities of TGC in 399 E. faecalis isolates were evaluated. Heteroresistance was evaluated by population analysis profiling. Resistance and heteroresistance mechanisms were investigated by identifying genetic mutations in tetracycline (tet) target sites and through analysis of efflux protein inhibitors (EPIs). Furthermore, quantitative proteomics was used to investigate the global proteomic response of E. faecalis to TGC stress, as well as the resistance mechanisms of TGC within in vitro induced resistant isolate.TGC minimum inhibitory concentrations (MICs) against clinical E. faecalis isolates were ≤0.5 mg/L. TGC displayed remarkable inhibitory activity against biofilm formation. The occurrence rate of TGC heteroresistance was 1.75% (7/399), and the increased TGC MIC values of heteroresistance-derived clones could be reversed by EPI. TGC resistance was associated with mutations in the 16S rRNA site or 30S ribosomal protein S10. A total of 105 and 356 differentially expressed proteins was identified after being exposed to 1/2× MIC concentrations of TGC, while 356 differentially expressed proteins was identified in TGC-resistant isolate. The differentially expressed proteins were enriched in the translation and DNA replication process. In addition, multiple adenosine triphosphate (ATP)-binding cassette (ABC) transporters were upregulated.TGC exhibited excellent activity against a substantial proportion of clinical isolates from China. However, E. faecalis exhibited a strong adaptation mechanism during TGC exposure: mutation of TGC target sites and elevated expression of efflux pumps under TGC selection, resulting in TGC resistance." @default.
• W4225254849 created "2022-05-04" @default.
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• W4225254849 date "2022-09-01" @default.
• W4225254849 modified "2023-09-27" @default.
• W4225254849 title "In vitro activity of tigecycline and proteomic analysis of tigecycline adaptation strategies in clinical Enterococcus faecalis isolates from China" @default.
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• W4225254849 doi "https://doi.org/10.1016/j.jgar.2022.04.022" @default.
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