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A spontaneous kanamycin-resistant Escherichia coli mutant, showing cross resistance to five other aminoglycosides and absence of the OppA protein was isolated. [3H]-dihydrostreptomycin uptake is reduced in this mutant, implying that the oligopeptide transport system is involved in accumulation of aminoglycosides, although apparently not related with aminoglycoside permeability alteration due to bacterial adaptation to osmotic changes. Um mutante espontâneo de Escherichia coli foi selecionado com canamicina e mostrou resistência cruzada a cinco outros aminoglicosídeos e ausência da proteína OppA. A incorporação de diidroestreptomicina tritiada mostrou-se reduzida nesse mutante, implicando que o sistema de transporte de oligopeptídeos está envolvido na acumulação de aminoglicosídeos, embora aparentemente não esteja relacionado com a alteração de permeabilidade aos aminoglicosídeos decorrente da adaptação bacteriana a mudanças osmóticas

revista de microbiologia

Spontaneous kanamycin-resistant Escherichia coli mutant with altered periplasmic oligopeptide permease protein (OppA) and impermeability to aminoglycosides