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Molecule Parameter List for PLC-Ca | 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 | Synaptic_
Network | 16 | Network |
Shared_Object_Synaptic_Network, PKC, PLA2,
PLCbeta, Gq, MAPK,
Ras, EGFR, Sos,
PLC_g, CaMKII, CaM,
PP1, PP2B, PKA,
AC, CaRegulation | This model is an annotated version of the synaptic signaling network.
The primary reference is Bhalla US and Iyengar R. Science (1999) 283(5400):381-7 but several of the model pathways have been updated.
Bhalla US Biophys J. 2002 Aug;83(2):740-52
Bhalla US J Comput Neurosci. 2002 Jul-Aug;13(1):49-62 |
PLC-Ca acting as a Molecule in Synaptic_Network Network
| Name | Accession Name | Pathway Name | Initial Conc.
(uM) | Volume
(fL) | Buffered | | PLC-Ca | Synaptic_
Network
Accession No. : 16 | PLCbeta
Pathway No. : 73 | 0 | 1000 | No | | Ca-bound form of PLCbeta. This form is moderately active. Reviewed in Sternweis et al 1992 Phil Trans Roy Soc. Lond. |
PLC-Ca acting as an Enzyme in Synaptic_Network Network
Enzyme Molecule /
Enzyme Activity | Accession Name | Pathway Name | Km (uM) | kcat (s^-1) | Ratio | Enzyme Type | Reagents | PLC-Ca /
PLC-Ca
| Synaptic_
Network
Accession No. : 16 | PLCbeta
Pathway No. : 73 | 19.8413 | 10 | 4 | explicit E-S complex | Substrate
PIP2
Product
DAG
IP3
| | From Sternweis et al Phil Trans R Soc Lond 1992, also matched by Homma et al. Km of 20 is higher than for the Gq bound form, but Vmax is about 1/3 of the Gq form. |
PLC-Ca acting as a Substrate in a reaction in Synaptic_Network 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 | | Act-PLC-by-Gq | Synaptic_
Network
Accession No. : 16 | PLCbeta
Pathway No. : 73 | 25.2
(uM^-1 s^-1) | 1
(s^-1) | Kd(bf) = 0.0397(uM) | - | Substrate
G*GTP
PLC-Ca
Product
PLC-Ca-Gq
| | Affinity for Gq is > 20 nM (Smrcka et al Science251 804-807 1991) so [Gq].kf = kb so 40nM * 6e5 = kb/kf = 24e3 so kf = 4.2e-5, kb =1 |
PLC-Ca acting as a Product in a reaction in Synaptic_Network 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 | | 1 | Act-PLC-Ca | Synaptic_
Network
Accession No. : 16 | PLCbeta
Pathway No. : 73 | 3
(uM^-1 s^-1) | 1
(s^-1) | Kd(bf) = 0.3333(uM) | - | Substrate
Ca
PLC
Product
PLC-Ca
| | | Affinity for Ca = 1uM without AlF, 0.1 with: from Smrcka et al science 251 pp 804-807 1991 Assigned affinity to a Kd of 0.333 to maintain detailed balance. | | 2 | Inact-PLC-Gq | Synaptic_
Network
Accession No. : 16 | PLCbeta
Pathway No. : 73 | 0.0133
(s^-1) | 0
(uM^-1 s^-1) | - | - | Substrate
PLC-Ca-Gq
Product
G*GDP
PLC-Ca
| | | This process is assumed to be directly caused by the inactivation of the G*GTP to G*GDP. Hence, kf = .013 /sec = 0.8/min, same as the rate for Inact-G. kb = 0 since this is irreversible. We may be interested in studying the role of PLC as a GAP. If so, the kf would be faster here than in Inact-G |
| Database compilation and code copyright (C) 2022, Upinder S. Bhalla and NCBS/TIFR
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