Table I. Key Rubisco catalytic parameters for five phylogenetic groups.
kcatc, Maximum carboxylation rate; Kcair, Michaelis-Menten constant for CO2 at atmospheric levels of O2 (21%); SC/O, specificity for CO2 versus O2. For details of the species within each group, see Figure 3. Values are means ± se of the mean (n as indicated).
| Group | n |
kcatc (s−1) |
Kcair (µm) |
SC/O |
||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 20°C | 25°C | 30°C | 20°C | 25°C | 30°C | 20°C | 25°C | 30°C | ||
| 1 | 34 | 2.3 ± 0.1 | 3.7 ± 0.2 | 5.7 ± 0.3 | 19.4 ± 0.9 | 28.6 ± 1.2 | 34.4 ± 1.7 | 114.9 ± 0.8 | 104.7 ± 0.6 | 92.6 ± 0.5 |
| 2 | 5 | 2.3 ± 0.2 | 3.9 ± 0.3 | 5.6 ± 0.1 | 14.8 ± 1.7 | 31.0 ± 2.9 | 40.1 ± 3.6 | 110.2 ± 1.9 | 99.4 ± 2.2 | 86.8 ± 0.9 |
| 3 | 4 | 2.3 ± 0.1 | 4.0 ± 0.3 | 7.2 ± 0.3 | 18.8 ± 3.9 | 39.5 ± 4.5 | 52.6 ± 8.3 | 110.0 ± 4.4 | 101.3 ± 3.1 | 88.5 ± 1.9 |
| 4 | 8 | 1.9 ± 0.1 | 3.1 ± 0.3 | 4.8 ± 0.3 | 16.4 ± 2.2 | 27.4 ± 1.9 | 30.3 ± 1.8 | 107.2 ± 1.1 | 99.8 ± 1.6 | 92.1 ± 1.3 |
| 5 | 18 | 1.9 ± 0.1 | 3.2 ± 0.2 | 5.2 ± 0.2 | 15.8 ± 1.0 | 25.9 ± 1.3 | 33.1 ± 2.4 | 107.7 ± 1.1 | 97.6 ± 1.2 | 87.2 ± 1.1 |