Aph(3′)-IIc, an Aminoglycoside Resistance Determinant from Stenotrophomonas maltophilia

Abstract
We report the characterization of an intrinsic, chromosomally carried aph(3′)-IIc gene from Stenotrophomonas maltophilia clinical isolate K279a, encoding an aminoglycoside phosphotransferase enzyme that significantly increases MICs of kanamycin, neomycin, butirosin, and paromomycin when expressed in Escherichia coli . Disruption of aph(3′)-IIc in K279a results in decreased MICs of these drugs.