| | Molecule Name/
Site Name | Km (uM) | kcat (1/s) | Ratio
(k2/k3) | Enzyme Type | Substrate | Product |
| 1 |
Enzyme Activity:
basal_GEF_
activity
Enzyme Molecule:
inact-GEF | 10.1015 | 0.02 | 4 | explicit E-S complex | GDP-Ras
| GTP-Ras
|
| | |
| 2 |
Enzyme Activity:
CaM-GEF-act-ras
Enzyme Molecule:
CaM-GEF | 0.505057 | 0.2 | 4 | explicit E-S complex | GDP-Ras
| GTP-Ras
|
| | Kinetics same as GEF-bg_act-ras, but as of March 17, 2006, the kcat is scaled from 0.02 to 0.2 to have a stronger Ca response for the direct MAPK input. |
| 3 |
Enzyme Activity:
GAP-inact-ras
Enzyme Molecule:
GAP | 1.0104 | 10 | 4 | explicit E-S complex | GTP-Ras
| GDP-Ras
|
| | From Eccleston et al JBC 268(36)pp27012-19 get Kd < 2uM, kcat - 10/sec From Martin et al Cell 63 843-849 1990 get Kd ~ 250 nM, kcat = 20/min I will go with the Eccleston figures as there are good error bars (10%). In general the values are reasonably close. k1 = 1.666e-3/sec, k2 = 1000/sec, k3 = 10/sec (note k3 is rate-limiting) 5 Nov 2002: Changed ratio term to 4 from 100. Now we have k1=8.25e-5; k2=40, k3=10. k3 is still rate-limiting. |
| 4 |
Enzyme Activity:
GEF*-act-ras
Enzyme Molecule:
GEF* | 0.505057 | 0.02 | 4 | explicit E-S complex | GDP-Ras
| GTP-Ras
|
| | Kinetics same as GEF-bg-act-ras |
