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Molecule Parameter List for CaMKII | 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_
2004_Feedback_
Tuning | 78 | Network |
Shared_Object_Ajay_Bhalla_2004_Feedback_Tuning, PKC, PLA2,
PLCbeta, Gq, MAPK,
Ras, EGFR, Sos,
PLC_g, CaMKII, CaM,
PP1, PP2B, PKA,
AC | | This model is taken from Ajay SM, Bhalla US. Eur J Neurosci. 2004 Nov;20(10):2671-80. This is the feedback model from Figure 8a. |
CaMKII acting as a Molecule in Ajay_Bhalla_2004_Feedback_Tuning Network
| Name | Accession Name | Pathway Name | Initial Conc.
(uM) | Volume
(fL) | Buffered | | CaMKII | Ajay_Bhalla_
2004_Feedback_
Tuning
Accession No. : 78 | CaMKII
Pathway No. : 357 | 70 | 1.5 | No | | Huge conc of CaMKII. In PSD it is 20-40% of protein, so we assume it is around 2.5% of protein in spine as a whole. This level is so high it is unlikely to matter much if we are off a bit. This comes to about 70 uM. |
CaMKII acting as a Product of an Enzyme in Ajay_Bhalla_2004_Feedback_Tuning Network
CaMKII acting as a Substrate in a reaction in Ajay_Bhalla_2004_Feedback_Tuning 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 | Ajay_Bhalla_
2004_Feedback_
Tuning
Accession No. : 78 | CaMKII
Pathway No. : 357 | 49.9995
(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. Kb/Kf = 6e4 #/cell. Rate is fast (see Hanson et al Neuron 12 943-956 1994) so lets say kb = 10. This gives kf = 1.6667e-4 H&S AnnRev Biochem 92 give tau for dissoc as 0.2 sec at low Ca, 0.4 at high. Low Ca = 100 nM = physiol. | | 2 | basal-activity | Ajay_Bhalla_
2004_Feedback_
Tuning
Accession No. : 78 | CaMKII
Pathway No. : 357 | 0.003
(s^-1) | 0
(s^-1) | - | - | Substrate
CaMKII
Product
CaMKII-thr286
| | | This reaction represents one of the big unknowns in CaMK-II biochemistry: what maintains the basal level of phosphorylation on thr 286 ? See Hanson and Schulman Ann Rev Biochem 1992 61:559-601, specially pg 580, for review. I have not been able to find any compelling mechanism in the literature, but fortunately the level of basal activity is well documented. |
| Database compilation and code copyright (C) 2022, Upinder S. Bhalla and NCBS/TIFR
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