Gentamicin uptake in Staphylococcus aureus possessing plasmid-encoded, aminoglycoside-modifying enzymes
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چکیده
منابع مشابه
Purification and characterization of aminoglycoside-modifying enzymes from Staphylococcus aureus and Staphylococcus epidermidis.
Several strains of Staphylococcus aureus and Staphylococcus epidermidis, exhibiting characteristic resistance patterns to aminoglycoside antibiotics, were examined. The aminoglycoside-modifying enzymes from these strains were purified by DEAE-Sephadex A-50 chromatography, affinity chromatography, and Sephadex G-100 gel filtration. Three enzymes, a 3'-phosphotransferase III (molecular weight, 31...
متن کاملGentamicin uptake in wild-type and aminoglycoside-resistant small-colony mutants of Staphylococcus aureus.
Gentamicin uptake and killing were studied in aminoglycoside-susceptible wild-type Staphylococcus aureus strains and aminoglycoside-resistant small-colony mutants selected by gentamicin from these strains. In wild-type S. aureus three phases of gentamicin accumulation were noted, and killing occurred during the last and most rapid phase of uptake. Uptake and killing were abolished by anaerobic ...
متن کاملIdentification of aminoglycoside-modifying enzymes by susceptibility testing: epidemiology of methicillin-resistant Staphylococcus aureus in Japan.
A multiple-primer PCR was used to identify genes encoding aminoglycoside-modifying enzymes in 381 clinical isolates of methicillin-resistant Staphylococcus aureus (MRSA). The technique used three sets of primers delineating specific DNA fragments of the aph(3')-III, ant(4')-I, and aac(6')-aph(2") genes, which influence the MICs of gentamicin, tobramycin, and lividomycin. Isolates with none of t...
متن کاملAminoglycoside modification by gentamicin-resistant isolates of Staphylococcus aureus.
Three clinical isolates of Staphylococcus aureus, which were previously shown to contain a 50S plasmid conferring resistance to several aminoglycosides, were examined for modifying enzymes. Both the wild-type and heat-cured derivatives of the isolates were screened for acetyl-, adenylyl-, and phosphotransferase activities. The substrates were gentamicin, amikacin, and netilmicin; the results in...
متن کاملMembrane potential and gentamicin uptake in Staphylococcus aureus.
At pH 5.0, the electrical potential (delta psi, interior negative) across the plasma membrane of Staphylococcus aureus exhibits a minimum of -85 to -90 mV; the pH gradient (delta pH, interior alkaline) across the membrane approximates a maximum of about -100 mV. Under these conditions, uptake of the aminoglycoside gentamicin is negligible, and viability of the organism is not impaired by the an...
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ژورنال
عنوان ژورنال: Antimicrobial Agents and Chemotherapy
سال: 1984
ISSN: 0066-4804,1098-6596
DOI: 10.1128/aac.26.4.563