Product inhibition steady-state kinetics. Double reciprocal plots of
1/k versus 1/[ATP] performed at 25 °C. A, ADP product
inhibition was measured using (i) varying [ATP] = 5, 10, 15, 20, 30, 50, and
100 μm, (ii) saturating fixed [Tide] = 200 μm, and
(iii) [ADP] = 0 μm (•), 5 μm (○), 10
μm (▴), 15 μm (▵), and 20
μm (▾). Solid lines were generated using the
kinetic constants determined from the global fit of the data to Equation S23
and its reciprocal Equation S26. B, pTide product inhibition was
measured using (i) varying [ATP] = 0.5, 1, 2, 3, 5, 10, 15, and 20
μm, (ii) saturating fixed [Tide] = 200 μm, and
(iii) [pTide] = 0 μm (•), 100 μm (○), 200
μm (▴), 300 μm (▵), and 400
μm (▾). Solid lines were generated using the
kinetic constants determined from the global fit of the data to Equation S31
and its reciprocal Equation S34.