Discrimination between Rb+ and K+ by Escherichia coli.

  title={Discrimination between Rb+ and K+ by Escherichia coli.},
  author={David B. Rhoads and Anna Woo and Wolfgang Epstein},
  journal={Biochimica et biophysica acta},
  volume={469 1},
1. The K+ requirment of Escherichia coli is only partially fulfilled by Rb+. The molar growth yield on Rb+ was about 5% of that on K+ and the growth rate in Rb+-supplemented media is lower thatn in K+ influx by any of the four K+ transport systems of E. coli. The high-affinity Kdp system (Km = 2 micron) is poorly traced by 86Rb+. It discriminates against a 86Rb+ tracer at least 1000-fold. The two moderate affinity systems, the high-rate TrkA system (Km = 1.5 mM) and the moderate rate TrkD… CONTINUE READING

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