Table 2.

Relationship of growth rate and K+ flux on expression of Kdp in strain TK2469

Carbon source and [K+] (mM)Growth rate (h−1)Net K+fluxa (μmol g−1min−1)Kdp expressionb (μmol g−1 min−1)
Glucose
 400.674.3650
 440.725.0310
 1150.83 NDc 2.5
dl-Lactate
 700.413.71.3
 1150.41ND 1.4
  • a Rate of net increase in cell K+ content during growth, measured as described in Materials and Methods.

  • b Values are levels of β-galactosidase from the fusion.

  • c ND, not determined.