Table 2.
Estimated in Vivo Mass-Action Ratios of Enzyme and Transport Reactions Involved in Suc-to-Starch Conversion
| Molar Mass-action Ratio
|
||||
|---|---|---|---|---|
| Reaction | Formula | Attached Tubers | Detached Tubers | Theoretical Equilibrium Constant (Keq) |
| SuSy (cytosol) |
![]() |
0.181 | 0.632 | 0.15 to 0.56a |
| UGPase (cytosol) |
![]() |
1.48 | 3.21 | 3.2b |
| Fructokinase (cytosol) |
![]() |
0.032 | 0.085 | 851c |
| Phosphoglucoisomerase (cytosol) |
![]() |
3.47 | 4.05 | 2c |
| PGM (cytosol) |
![]() |
11.9 | 10.5 | 19c |
| Glc-6-P/Pi translocator |
![]() |
2.04 | 2.97 | 1d |
| 3PGA/Pi translocator |
![]() |
1.85 | 3.31 | 1d |
| Adenylate translocator |
![]() |
0.359 | 0.961 | 1d |
| PGM (plastid) |
![]() |
0.046 | 0.078 | 0.053c |
| AGPase (plastid) |
![]() |
1.6 × 10−2 | 4 × 10−4 | 1e |
| Inorganic pyrophosphatase (plastid) |
![]() |
0.323 | 0.373 | 1000b |
The data from Table 1 were used to calculate the in vivo molar mass-action ratios (ratio of product to substrate concentration) for each reaction. The theoretical equilibrium constant (ratio of product/substrate concentration) at which the net flux is zero) of each reaction is shown for comparison.
Estimated value.










