Abstract
Preparations of Ag 2 S nanoparticles obtained in equimolar AgNO3 and Na2S2O3 aqueous solutions in the presence of Shewanella oneidensis MR-1 bacteria cells have been shown to be stable in aqueous solutions. Proteins absorbed on the surface of these nanoparticles were identified for the first time by the MALDI TOF/TOF method. Among them, multi-heme cytochromes MtrC and OmcA, as well as a MtrB membrane protein porin that forms a complex with these cytochromes on the outer cell membrane were detected. It was shown that in the absence of the cells, an insoluble precipitate consisting of agglomerated Ag 2 S nanoparticles with broad size distribution was formed. The role of the identified proteins in the mechanism of the formation and stabilization of the Ag 2 S nanoparticles in this system is discussed.
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