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. 1981 Sep;20(3):344–350. doi: 10.1128/aac.20.3.344

Aminoglycoside phosphotransferase-II-mediated amikacin resistance in Escherichia coli.

G P Bongaerts, G M Kaptijn
PMCID: PMC181698  PMID: 6272630

Abstract

An Escherichia coli strain with a plasmidic amikacin resistance has been selected for which the evidence strongly indicates that resistance is mediated by aminoglycoside phosphotransferase [APH(3')-II]: (i) this resistance was coupled with resistance against kanamycin and neomycin; (ii) partially purified APH(3')-II[APH(3") free] modified amikacin by phosphorylation; (iii) the product of the APH(3')-II mediated reaction (i.e., 3'-O-phosphoryl-amikacin) lost its antibacterial activity; and (iv) the amikacin-modifying APH(3')-II activity increased 5- to 10-fold after adaptation of the cells to higher concentrations of amikacin. The substrate spectrum of this enzyme showed a low activity against amikacin as compared with neomycin. It is argued that the enzyme level rather than its substrate spectrum is important for enzyme-mediated resistance. The increase in enzyme levels was found to be correlated with an increase in copy number of a 110-Megadalton plasmid (pBN66) which coded for the APH(3')-II and the APH(3") activity. The increase in copy number was irreversible, and therefore this phenomenon is ascribed to a mutation of a gene which affects the copy number. In transconjugants, the original low copy number was present, and therefore the mutation must be located on the chromosome and not on the plasmid.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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