The role of proteins of the outer membrane of Shewanella oneidensis MR-1 in the formation and stabilization of silver sulfide nanoparticles
2016
Voeikova, T. A. | Shebanova, A. S. | Ivanov, Yu. D. | Kaysheva, A. L. | Novikova, L. M. | Zhuravliova, O. A. | Shumyantseva, V. V. | Shaitan, K. V. | Kirpichnikov, M. P. | Debabov, V. G.
Silver sulfide nanoparticles stable in aqueous solutions were obtained in presence of the cells of the bacterium Shewanella oneidensis MR-1 in aqueous solution containing an equimolar mixture of AgNO₃ and Na₂S₂O₃. Proteins absorbed on the surface of Ag₂S nanoparticles were identified for the first time by MALDITOF/TOF. Among these proteins, multiheme cytochromes MtrC and OmcA, as well as the MtrB membrane porin, which forms a complex on the outer cell membrane, were detected. It was shown that an insoluble precipitate consisting of agglomerated Ag₂S nanoparticles with a wide size distribution was formed in the absence of the cells. The role of the detected proteins in the mechanism of the formation and stabilization of the Ag₂S nanoparticles in the studied system is discussed.
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