TABLE 3.

Efficiency and selectivity of phosphate transporters for phosphate and selenite uptakes

The values are deduced from the data in Table II for P_i uptake and from values given in the text for selenite uptake.

Pi transporter expressed	Strain and growth conditions	Vmax/Km for Pi	Vmax/Km for selenite	Selectivitya
		pmol OD−1·min−1·mm−1	pmol OD−1·min−1·mm−1
Pho84p	BY4742 and 0.3 mm Pi	43000	34	1260
Low affinity	BY4742 and 7.3 mm Pi	370	10.5	35

^a Selectivity is defined as the ratio between the V_max/K_m for P_i uptake and that for selenium uptake.