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Molecule Parameter List for CaM-Ca4 | 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 | Osc_Ca_
IP3metabolism | 32 | Network |
MIPP, CaMKII, CaM,
PKC, IP3-3K, Gq,
PLCbeta, 134_dephos, 145_dephos,
IP4-system, IHP-system, 1345_dephos,
CaRegulation, Othmer-Tang-model | | This network models an oscillatory calcium response to GPCR mediated PLCbeta activation, alongwith detailed InsP3 metabolism in the neuron. It is similar to the Osc_Ca_IP3metab model (accession 24) except that some enzymes in the InsP3 metabolism network have been modified to have reversible kinetics rather than Michaelis-Menten kinetics. The 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. |
CaM-Ca4 acting as a Molecule in Osc_Ca_IP3metabolism Network
| Name | Accession Name | Pathway Name | Initial Conc.
(uM) | Volume
(fL) | Buffered | | CaM-Ca4 | Osc_Ca_
IP3metabolism
Accession No. : 32 | CaM
Pathway No. : 160 | 0 | 1000 | No | | The four-calcium-bound form of CaM. It is the active form for most reactions. |
CaM-Ca4 acting as a Substrate in a reaction in Osc_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 | | 1 | CaMKII-bind-CaM | Osc_Ca_
IP3metabolism
Accession No. : 32 | CaMKII
Pathway No. : 159 | 49.9998
(uM^-1 s^-1) | 5
(s^-1) | Kd(bf) = 0.1(uM) | - | Substrate
CaM-Ca4
CaMKII
Product
CaMKII-CaM
| | | This is tricky. There is some cooperativity here arising from interactions between the subunits of the CAMKII holoenzyme. However, the stoichiometry is 1. Kd = 0.1 uM. Rate is fast (see Hanson et al Neuron 12 943-956 1994) Hanson and Schulman 1992 AnnRev Biochem 61:559-601 give tau for dissoc as 0.2 sec at low Ca, 0.4 at high. Low Ca = 100 nM = physiol. | | 2 | CaMK-thr286-bind
-CaM | Osc_Ca_
IP3metabolism
Accession No. : 32 | CaMKII
Pathway No. : 159 | 1000.2
(uM^-1 s^-1) | 0.1
(s^-1) | Kd(bf) = 0.0001(uM) | - | Substrate
CaM-Ca4
CaMKII-thr286
Product
CaMKII-thr286*-C
aM
| | | Affinity is up 1000X over the unphosphorylated CaMKII, which makes the Kd of 0.1 nM. See Hanson et al 1994 Neuron 12:943-956. Time to release is about 20 sec, so the kb is OK at 0.1/sec. as tested by a few runs. | | 3 | 3K-bind-CaM | Osc_Ca_
IP3metabolism
Accession No. : 32 | IP3-3K
Pathway No. : 162 | 19.2312
(uM^-1 s^-1) | 1
(s^-1) | Kd(bf) = 0.052(uM) | - | Substrate
CaM-Ca4
IP3_3K
Product
IP3_3K_CaM
| | | Communi et al, EMBO J 16; 1997 non-phosphorylated 3kinase with low sensitivity to CaM binding (Kd = 52nM) | | 4 | 3K*-bind-CaM | Osc_Ca_
IP3metabolism
Accession No. : 32 | IP3-3K
Pathway No. : 162 | 49.9998
(uM^-1 s^-1) | 0.1
(s^-1) | Kd(bf) = 0.002(uM) | - | Substrate
CaM-Ca4
IP3_3K*
Product
IP3_3K_CaM*
| | | Communi et al, EMBO J 16; 1997 phosphorylated 3kinase has 25 fold greater sensitivity to CaM binding than the non-phosphorylated enzyme (Kd of 2nM) |
CaM-Ca4 acting as a Product in a reaction in Osc_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 | | CaM-Ca3-bind-Ca | Osc_Ca_
IP3metabolism
Accession No. : 32 | CaM
Pathway No. : 160 | 0.465
(uM^-1 s^-1) | 10
(s^-1) | Kd(bf) = 21.5054(uM) | - | Substrate
Ca
CaM-Ca3
Product
CaM-Ca4
| | Use K3 = 21.5 uM here from Stemmer and Klee table 3. Stemmer and Klee 1994 Biochem 33:6859-6866 kb/kf =21.5 * 6e5 so kf = 7.75e-7, kb = 10 |
| Database compilation and code copyright (C) 2022, Upinder S. Bhalla and NCBS/TIFR
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