Table 1.

Rate constants and parameters of the seven-state kinetic model

Parameter Value SD 
k120 (s−1) 1,500 110 
k230 (s−1) 59 2 
k340 (s−1) 200 10 
k450 (M−2s−1) 600,000 140,000 
k560 (M1s1111,000 4,300 
k670 (s1300 25 
k710 (s1100 
12 -0.41 0.01 
23 0.00 0.001 
34 −0.70 0.02 
45 −0.19 0.02 
56 −0.01 0.01 
67 −0.66 0.02 
71 −0.02 0.01 
k210 (s−1) 200 35 
k320 (s−1) 200 10 
k430 (s−1) 1,900 55 
k540 (s−1) 1,000 160 
k650 (s−182 
k760 (s−1700 50 
k170 (M−3 s−16,700,000 220,000 
N90Na 1.35 × 1011 3.6 × 109 
N50Na 8.94 × 1010 2.5 × 109 
N10Na 1.24 × 1011 5.5 × 109 
N0.1αMG 7.34 × 1010 2.1 × 108 
N5αMG 7.93 × 1010 6.3 × 108 
Parameter Value SD 
k120 (s−1) 1,500 110 
k230 (s−1) 59 2 
k340 (s−1) 200 10 
k450 (M−2s−1) 600,000 140,000 
k560 (M1s1111,000 4,300 
k670 (s1300 25 
k710 (s1100 
12 -0.41 0.01 
23 0.00 0.001 
34 −0.70 0.02 
45 −0.19 0.02 
56 −0.01 0.01 
67 −0.66 0.02 
71 −0.02 0.01 
k210 (s−1) 200 35 
k320 (s−1) 200 10 
k430 (s−1) 1,900 55 
k540 (s−1) 1,000 160 
k650 (s−182 
k760 (s−1700 50 
k170 (M−3 s−16,700,000 220,000 
N90Na 1.35 × 1011 3.6 × 109 
N50Na 8.94 × 1010 2.5 × 109 
N10Na 1.24 × 1011 5.5 × 109 
N0.1αMG 7.34 × 1010 2.1 × 108 
N5αMG 7.93 × 1010 6.3 × 108 

The seven-state model refers to the scheme presented in Fig. 3. The parameters highlighted in bold were obtained using the five-state model (absence of αMG) before expansion to the seven-state cotransport model. The αi’s (representing the energy barrier asymmetries) are fixed at 0.5. The rate constant k170 is adjusted to respect microreversibility. In the case of the five-state model, the SD was computed using 11 parameter sets reproducing satisfactorily the current traces averaged from four oocytes, whereas 8 parameter sets were used for the three additional transitions taking place in the seven-state model.

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