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Molecule Parameter List for ip4_1k_cmplx | 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 | NonOsc_Ca_
IP3metabolism | 31 | Network |
MIPP, CaMKII, CaM,
PKC, IP3-3K, CaRegulation,
Gq, PLCbeta, 134_dephos,
145_dephos, IP4-system, IHP-system,
1345_dephos | | This network models detailed metabolism of Ins(145)P3, integrated with GPCR mediated PLCbeta activation and Ca release by the InsP3 receptor in the neuron. It is similar to the NonOsc_Ca_IP3metab model (accession 23) except that some enzymes have been modified to have reversible kinetics rather than Michaelis-Menten kinetics. These modified enzymes belong to the groups: IP4-system, IP3-3K, 145_dephos and 134_dephos. Mishra J, Bhalla US. Biophys J. 2002 Sep;83(3):1298-316. |
ip4_1k_cmplx acting as a Molecule in NonOsc_Ca_IP3metabolism Network
| Name | Accession Name | Pathway Name | Initial Conc.
(uM) | Volume
(fL) | Buffered | | ip4_1k_cmplx | NonOsc_Ca_
IP3metabolism
Accession No. : 31 | IP4-system
Pathway No. : 154 | 0 | 1000 | No | | Enzyme complex exclusively modeled to accomodate reversible kinetics as opposed to M-M kinetics. Enzyme reversibility ascertained from dG calculations at -10 kJ/mol that yield a significant back flux from IP5. Also IP4-1K is experimentally reversible: Ho et al, Curr Biol, Mar 2002, 12: 1-20 |
ip4_1k_cmplx acting as a Substrate in a reaction in NonOsc_Ca_IP3metabolism 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 | | ip4-1k-off | NonOsc_Ca_
IP3metabolism
Accession No. : 31 | IP4-system
Pathway No. : 154 | 0.624
(s^-1) | 0.056
(uM^-1 s^-1) | Kd(cb) = 0.0897(uM) | - | Substrate
ip4_1k_cmplx
Product
IP3-56K_IP4-1K
IP5(13456)
| | Kf = enzyme Vmax : Yang and Shears, Biochem J 2000, 351, 551-5. Kb ascertained from dG calculations for equilibrium product substrate conditions. Ho et al, Curr Biol 2002, 12: 1-20 report a Vmax for reverse reaction of 0.0656 /sec. But this cannot be exactly incorporated unless Km for InsP5 is also known. Simulations show that incorporation of this reverse reaction can maintain basal InsP4 levels but cannot achieve the stimulated InsP4 levels shown in Ho et al. Hence the separate InsP5 1pase is retained. |
ip4_1k_cmplx acting as a Product in a reaction in NonOsc_Ca_IP3metabolism 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 | | ip4-1k-on | NonOsc_Ca_
IP3metabolism
Accession No. : 31 | IP4-system
Pathway No. : 154 | 31.2001
(uM^-1 s^-1) | 2.496
(s^-1) | Kd(bf) = 0.08(uM) | - | Substrate
IP3-56K_IP4-1K
IP4(3456)
Product
ip4_1k_cmplx
| | Rates derives from enzyme Km and Vmax values: Yang and Shears, Biochem J 2000, 351: 551-555. |
| Database compilation and code copyright (C) 2022, Upinder S. Bhalla and NCBS/TIFR
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