1887

Abstract

The mechanisms of resistance to apramycin of five isolates of from animals were investigated. Three isolates, which were resistant to all the aminoglycosides tested, did not transfer their resistance and did not produce aminoglycoside-modifying enzymes. The fourth isolate, which was resistant to apramycin, tobramycin, gentamicin, kanamycin and neomycin but not to amikacin, owed its resistance to production of the acetyltransferase AAC(3)IV. The gene specifying this enzyme was carried on a transposon, Tn, on a plasmid designated R1535. The fifth isolate was resistant to apramycin, neomycin and kanamycin but not to gentamicin, tobramycin or amikacin. It produced an acetyltransferase that readily acetylated only apramycin, neomycin and paromomycin, a compound that is closely related to neomycin. Synthesis of this enzyme was specified by a chromosomal gene located near at about 20 min on the map of the K12 chromosome.

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1984-03-01
2021-08-03
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