Table 1.

Kinetic parameters for Bv-PPase activation by Na⁺ and K⁺

Activator	pH	Ka, mM	V1, nmol·min−1·mg−1	V2, nmol·min−1·mg−1	Ki, mM
Na+	7.2	0.57 ± 0.06/33 ± 3	<3/<3	420 ± 20/360 ± 20	340 ± 60/320 ± 30
Na+	5.5	2.0 ± 0.3/21 ± 2	<2/<2	160 ± 10/56 ± 5	310 ± 70/n.d.
K+	7.2	11 ± 3	150 ± 10	390 ± 20
K+	5.5	12 ± 3	44 ± 4	170 ± 10

Parameter values separated by the slashed line were measured in the presence and absence of 50 mM K⁺, respectively. K⁺ binding experiments were conducted in the presence of 50 mM Na⁺. Parameter values are reported with SD. n.d., not determined.