Table 4.

Effect of a cepI mutation on siderophore, protease, and lipase productiona

StrainGenotypeSupernatant CAS activity (A630/A600)CAS agar zone diam (mm)Ornibactinb (μg/ml/ A600)Protease zone radius (mm)Lipase activity (U/ml/ A600)
K56-2Wild type1.39 ± 0.009.5 ± 0.528.9 ± 7.65.5 ± 0.50.53 ± 0.02
K56-I2 cepI::tmp 2.14 ± 0.44c 13.5 ± 0.3c 46.5 ± 10.3c 0c 0.46 ± 0.07
  • a All values are the means ± standard deviations of triplicate experiments, unless indicated otherwise.

  • b Mean ± standard deviation of quadruplicate experiments.

  • c Significantly different from parent K56-2 in unpaired t test (P < 0.05).