期刊
INORGANIC CHEMISTRY
卷 61, 期 26, 页码 10089-10100出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.2c01085
关键词
-
资金
- National Scientific Program for young scientists - Bulgarian Ministry of Education and Science [DCM 577/2018, 271/2019]
Although silver has broad applications in everyday life, the mechanism of its bacteriostatic/bactericidal activity is not fully understood. This research reveals that the silver cation shows different preferences for constituents in Gram-negative and Gram-positive bacteria, shedding light on the specific interactions between the silver cation and phosphate-containing units.
Although silver is one of the first metals finding broad applications in everyday life, specific key points of the intimate mechanism of its bacteriostatic/bactericidal activity lack explanation. It is widely accepted that the antimicrobial potential of the silver cation depends on the composition and thickness of the bacterial external envelope: the outer membrane in Gram-negative bacteria is more prone to Ag+ attack than the cell wall in Gram-positive bacteria. The major cellular components able to interact strongly with Ag+ (teichoic acids, phospholipids, and lipopolysaccharides) contain mono/diesterified phosphate moieties. By applying a reliable DFT/SMD methodology, we modeled the reactions between the aforementioned constituents in typical Gram-positive and Gram-negative bacteria and hydrated Ag+ species, thus disclosing the factors that govern the process of metal-model ligand complexation. The conducted research indicates thermodynamically possible reactions in all cases but still a greater preference of the Ag+ toward the constituents in Gram-negative bacteria in comparison with their counterparts in Gram-positive bacteria. The observed tendencies shed light on the specific interactions of the silver cation with the modeled phosphate-containing units at the atomic level.
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