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Molecule Parameter List for PKC-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 | | PKC_turnover | 26 | Pathway |
PKC | | This model is a superset of the PKC model presented in Bhalla US and Iyengar R. Science (1999) 283(5400):381-7. The current version includes PKC turnover. This version includes the stimulating pools Ca, AA and DAG as well as the PKC activity within the synaptic signaling pathway since it is meant to be a self-contained pathway model rather than part of a network. |
PKC-Ca acting as a Molecule in PKC_turnover Network
| Name | Accession Name | Pathway Name | Initial Conc.
(uM) | Volume
(fL) | Buffered | | PKC-Ca | PKC_turnover
Accession No. : 26 | PKC
Pathway No. : 138 | 0 | 1000 | No | | This intermediate is strongly indicated by the synergistic activation of PKC by combinations of DAG and Ca, as well as AA and Ca. PKC by definition also has a direct Ca-activation, to which this also contributes. |
PKC-Ca acting as a Substrate in a reaction in PKC_turnover 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 | PKC-act-by-DAG | PKC_turnover
Accession No. : 26 | PKC
Pathway No. : 138 | 0.008
(uM^-1 s^-1) | 8.6348
(s^-1) | Kd(bf) = 1079.377(uM) | - | Substrate
DAG
PKC-Ca
Product
PKC-Ca-DAG
| | | Ca.PKC interaction with DAG is modeled by this reaction. Kf based on Shinomura et al PNAS 88 5149-5153 1991 and Schaechter and Benowitz 1993 J Neurosci 13(10):4361 and uses the constraining procedure referred to in the general notes for PKC. | | 2 | PKC-Ca-to-memb | PKC_turnover
Accession No. : 26 | PKC
Pathway No. : 138 | 1.2705
(s^-1) | 3.5026
(s^-1) | Keq = 2.7569(uM) | 0.21sec | Substrate
PKC-Ca
Product
PKC-Ca-memb*
| | | Membrane translocation is a standard step in PKC activation. It also turns out to be necessary to replicate the curves from Schaechter and Benowitz 1993 J Neurosci 13(10):4361 and Shonomura et al 1991 PNAS 88:5149-5153. These rates are constrained by matching the curves in the above papers and by fixing a rather fast (sub-second) tau for PKC activation. | | 3 | PKC-act-by-Ca-AA | PKC_turnover
Accession No. : 26 | PKC
Pathway No. : 138 | 0.0012
(uM^-1 s^-1) | 0.1
(s^-1) | Kd(bf) = 83.3333(uM) | - | Substrate
AA
PKC-Ca
Product
PKC-Ca-AA*
| | | Ca-dependent AA activation of PKC. Note that this step combines the AA activation and also the membrane translocation. From Schaechter and Benowitz 1993 J Neurosci 13(10):4361 |
PKC-Ca acting as a Product in a reaction in PKC_turnover 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 | | PKC-act-by-Ca | PKC_turnover
Accession No. : 26 | PKC
Pathway No. : 138 | 0.6
(uM^-1 s^-1) | 0.5
(s^-1) | Kd(bf) = 0.8333(uM) | - | Substrate
Ca
PKC-cytosolic
Product
PKC-Ca
| | This Kd is a straightforward result from the Schaechter and Benowitz 1993 J Neurosci 13(10):4361 curves. The time-course is based on the known rapid activation of PKC and also the fact that Ca association with proteins is typicmpdmyy quite fast. My guess is that this tau of 2 sec is quite conservative and the actualy rate may be much faster. The parameter is quite insensitive for most stimuli. |
| Database compilation and code copyright (C) 2022, Upinder S. Bhalla and NCBS/TIFR
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