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Reaction List for pathway CaMKII (Pathway Number 216) in Accession MAPK_network_2003 (Accession Number 50) | Entries are grouped according to Pathway Number and they are alternately color coded using  and  color.
Further ordering can be done to the table header.   indicates that ordering is done according to ascending or descending order.
Keq is calculated only for first order reactions.
Kd is calculated only for second order reactions. [nA+nB <->nC or nA<->nC+nD, where n is number and A,B,C,D are molecules] |
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Reaction
Name | Pathway Name /
Pathway No. | Kf | Kb | Kd | tau | Reagents | | 1 | CaMKII-bind-CaM | CaMKII
Pathway No. 216 | 49.9998
(uM^-1 s^-1) | 5
(s^-1) | Kd(bf) = 0.1(uM) | - | Substrate:
CaM-Ca4
CaMKII
Products:
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 | CaMK-thr286-bind
-CaM | CaMKII
Pathway No. 216 | 1000.2
(uM^-1 s^-1) | 0.1
(s^-1) | Kd(bf) = 0.0001(uM) | - | Substrate:
CaMKII-thr286
CaM-Ca4
Products:
CaMKII-thr286*-C
aM
| | | Affinity is up 1000X. Time to release is about 20 sec, so the kb is OK at 0.1 This makes Kf around 1.6666e-3 | | 3 | basal-activity | CaMKII
Pathway No. 216 | 0.003
(s^-1) | 0
(s^-1) | - | - | Substrate:
CaMKII
Products:
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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