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Molecule Parameter List for PKA-active | 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 | Synaptic_
Network | 16 | Network |
Shared_Object_Synaptic_Network, PKC, PLA2,
PLCbeta, Gq, MAPK,
Ras, EGFR, Sos,
PLC_g, CaMKII, CaM,
PP1, PP2B, PKA,
AC, CaRegulation | This model is an annotated version of the synaptic signaling network.
The primary reference is Bhalla US and Iyengar R. Science (1999) 283(5400):381-7 but several of the model pathways have been updated.
Bhalla US Biophys J. 2002 Aug;83(2):740-52
Bhalla US J Comput Neurosci. 2002 Jul-Aug;13(1):49-62 |
PKA-active acting as a Molecule in Synaptic_Network Network
PKA-active acting as an Enzyme in Synaptic_Network Network
| | Enzyme Molecule /
Enzyme Activity | Accession Name | Pathway Name | Km (uM) | kcat (s^-1) | Ratio | Enzyme Type | Reagents | | 1 | PKA-active /
PKA-phosph-GEF
| Synaptic_
Network
Accession No. : 16 | Shared_Object_
Synaptic_
Network
Pathway No. : 70 | 7.5 | 9 | 4 | explicit E-S complex | Substrate
inact-GEF
Product
inact-GEF*
| | | This pathway inhibits Ras when cAMP is elevated. See: Hordijk et al JBC 269:5 3534-3538 1994 Burgering et al EMBO J 12:11 4211-4220 1993 The rates are the same as used in PKA-phosph-I1 | | 2 | PKA-active /
PKA-phosph-I1
| Synaptic_
Network
Accession No. : 16 | Shared_Object_
Synaptic_
Network
Pathway No. : 70 | 7.5 | 9 | 4 | explicit E-S complex | Substrate
I1
Product
I1*
| | | Numbers from Bramson et al CRC crit rev Biochem 15:2 93-124. They have a huge list of peptide substrates and I have chosen high-ish rates. These consts give too much PKA activity, so lower Vmax 1/3 since Cohen et al FEBS Lett 76:182-86 1977 say rate =30% PKA act on phosphokinase beta. | | 3 | PKA-active /
phosph-PDE
| Synaptic_
Network
Accession No. : 16 | Shared_Object_
Synaptic_
Network
Pathway No. : 70 | 7.5 | 9 | 4 | explicit E-S complex | Substrate
cAMP-PDE
Product
cAMP-PDE*
| | | Same rates as PKA-phosph-I1 |
PKA-active acting as a Substrate in a reaction in Synaptic_Network 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 | | inhib-PKA | Synaptic_
Network
Accession No. : 16 | PKA
Pathway No. : 84 | 60
(uM^-1 s^-1) | 1
(s^-1) | Kd(bf) = 0.0167(uM) | - | Substrate
PKA-active
PKA-inhibitor
Product
inhibited-PKA
| | See Doskeland and Ogreid Int J Biochem 13:1-19. Not clear what the rates are, but the reaction has to be fast and it has to have a pretty high affinity. The exact values are not critical under these conditions. |
PKA-active acting as a Product in a reaction in Synaptic_Network 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 | Release-C1 | Synaptic_
Network
Accession No. : 16 | PKA
Pathway No. : 84 | 60
(s^-1) | 18
(uM^-1 s^-1) | Kd(cb) = 0.3(uM) | - | Substrate
R2C2-cAMP4
Product
PKA-active
R2C-cAMP4
| | | The complex starts to dissociate and release the catalytic subunit C. This has to be fast, as the activation of PKA by cAMP is also fast. | | 2 | Release-C2 | Synaptic_
Network
Accession No. : 16 | PKA
Pathway No. : 84 | 60
(s^-1) | 18
(uM^-1 s^-1) | Kd(cb) = 0.3(uM) | - | Substrate
R2C-cAMP4
Product
PKA-active
R2-cAMP4
| | | Second catalytic subunit is now released. |
| Database compilation and code copyright (C) 2022, Upinder S. Bhalla and NCBS/TIFR
This Copyright is applied to ensure that the contents of this database remain freely available. Please see FAQ for details. |
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