期刊
MOLECULES
卷 26, 期 14, 页码 -出版社
MDPI
DOI: 10.3390/molecules26144189
关键词
lytic transglycosylase; thionine acetate; enzyme inhibition; antibacterial
资金
- UK Biotechnology and Biological Sciences Research Council (BBSRC) [BB/L01758X/1]
- Life Sciences Research NetworkWales [NRNRG4Mar039]
- Libyan Embassy (London) [10007]
- Royal Society of Chemistry, Undergraduate Research Bursary
- Cardiff University
- Swansea University
- BBSRC [BB/L01758X/1] Funding Source: UKRI
Lytic transglycosylases like Slt35 are potential targets for novel antibacterial agents. Thionine acetate was found to be a weak inhibitor of both Slt35 and lysozyme, and also enhanced the efficacy of ampicillin against E. coli.
Lytic transglycosylases such as Slt35 from E. coli are enzymes involved in bacterial cell wall remodelling and recycling, which represent potential targets for novel antibacterial agents. Here, we investigated a series of known glycosidase inhibitors for their ability to inhibit Slt35. While glycosidase inhibitors such as 1-deoxynojirimycin, castanospermine, thiamet G and miglitol had no effect, the phenothiazinium dye thionine acetate was found to be a weak inhibitor. IC50 values and binding constants for thionine acetate were similar for Slt35 and the hen egg white lysozyme. Molecular docking simulations suggest that thionine binds to the active site of both Slt35 and lysozyme, although it does not make direct interactions with the side-chain of the catalytic Asp and Glu residues as might be expected based on other inhibitors. Thionine acetate also increased the potency of the beta-lactam antibiotic ampicillin against a laboratory strain of E. coli.
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