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Molecule Parameter List for inact-GEF | The statistics table lists the distribution of a molecule acting either as a substrate, product, enzyme or as a molecule within the network.
The text color of a molecule is highlighted by  color. | | Statistics |
Accession and Pathway Details | |
| Accession Name | Accession No. | Accession Type | Pathway Link | Ajay_Bhalla_
2007_Bistable | 79 | Network |
Shared_Object_Ajay_Bhalla_2007_Bistable, PKC, PLA2,
MAPK, Ras, CaM | This is a model of ERKII signaling which is bistable due to feedback. The feedback occurs through ERKII phosphorylation of phospholipase A2 (PLA2), leading to increased production of arachidonic acid (AA), which activates protein kinase C (PKC) which activates c-Raf which is upstream of ERKII.
The model is a highly simplified variant of more detailed bistable models of MAPK signaling (Bhalla US, Iyengar R. Science. 1999 Jan 15;283(5400):381-7, Ajay SM, Bhalla US. Eur J Neurosci. 2004 Nov;20(10):2671-80) |
inact-GEF acting as a Molecule in Ajay_Bhalla_2007_Bistable Network
| Name | Accession Name | Pathway Name | Initial Conc.
(uM) | Volume
(fL) | Buffered | | inact-GEF | Ajay_Bhalla_
2007_Bistable
Accession No. : 79 | Ras
Pathway No. : 367 | 0.1 | 125.7 | No | | Assume that SoS is present only at 50 nM. Revised to 100 nM to get equil to experimentally known levels. |
inact-GEF acting as an Enzyme in Ajay_Bhalla_2007_Bistable Network
Enzyme Molecule /
Enzyme Activity | Accession Name | Pathway Name | Km (uM) | kcat (s^-1) | Ratio | Enzyme Type | Reagents | inact-GEF /
basal_GEF_
activity
| Ajay_Bhalla_
2007_Bistable
Accession No. : 79 | Ras
Pathway No. : 367 | 10.1014 | 0.02 | 4 | explicit E-S complex | Substrate
GDP-Ras
Product
GTP-Ras
| | |
inact-GEF acting as a Substrate for an Enzyme in Ajay_Bhalla_2007_Bistable Network
Enzyme Molecule /
Enzyme Activity | Accession Name | Pathway Name | Km (uM) | kcat (s^-1) | Ratio | Enzyme Type | Reagents | PKC-active /
PKC-act-GEF | Ajay_Bhalla_
2007_Bistable
Accession No. : 79 | Shared_Object_
Ajay_Bhalla_
2007_Bistable
Pathway No. : 363 | 3.33331 | 4 | 4 | explicit E-S complex | Substrate
inact-GEF
Product
GEF*
| | Rate consts from PKC-act-raf. This reaction activates GEF. It can lead to at least 2X stim of ras, and a 2X stim of MAPK over and above that obtained via direct phosph of c-raf. Note that it is a push-pull reaction, and there is also a contribution through the phosphorylation and inactivation of GAPs. The original PKC-act-raf rate consts are too fast. We lower K1 by 10 X |
inact-GEF acting as a Substrate in a reaction in Ajay_Bhalla_2007_Bistable Network
| Kd is calculated only for second order reactions, like nA+nB <->nC or nA<->nC+nD, where n is number and A,B,C,D are molecules, where as for first order reactions Keq is calculated.
Kd for higher order reaction are not consider. |
| Name | Accession Name | Pathway Name | Kf | Kb | Kd | tau | Reagents | | CaM-bind-GEF | Ajay_Bhalla_
2007_Bistable
Accession No. : 79 | Ras
Pathway No. : 367 | 199.999
(uM^-1 s^-1) | 1
(s^-1) | Kd(bf) = 0.005(uM) | - | Substrate
CaM-Ca4
inact-GEF
Product
CaM-GEF
| | We have no numbers for this. It is probably between the two extremes represented by the CaMKII phosph states, and I have used guesses based on this. kf=1e-4 kb=1 The reaction is based on Farnsworth et al Nature 376 524-527 1995 28 Feb 2006: Increased affinity 36-fold to account for Ca input to MAPK cascade, possibly folding in other pathway inputs. 21 April 2006: Altered affinity to same level as pkm_mapk21.g model to prevent spontaneous turnon. Kf = 200, Kb = 1. |
inact-GEF acting as a Product in a reaction in Ajay_Bhalla_2007_Bistable Network
| Kd is calculated only for second order reactions, like nA+nB <->nC or nA<->nC+nD, where n is number and A,B,C,D are molecules, where as for first order reactions Keq is calculated.
Kd for higher order reaction are not consider. |
| Name | Accession Name | Pathway Name | Kf | Kb | Kd | tau | Reagents | | dephosph-GEF | Ajay_Bhalla_
2007_Bistable
Accession No. : 79 | Ras
Pathway No. : 367 | 1
(s^-1) | 0
(s^-1) | - | - | Substrate
GEF*
Product
inact-GEF
|
| Database compilation and code copyright (C) 2022, Upinder S. Bhalla and NCBS/TIFR
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