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Molecule Parameter List for I1 | 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 | |
I1 acting as a Molecule in CaMKII_2003 Network
| Name | Accession Name | Pathway Name | Initial Conc.
(uM) | Volume
(fL) | Buffered | | I1 | CaMKII_2003
Accession No. : 49 | PP1
Pathway No. : 204 | 1.8 | 1000 | No | | I1 is a 'mixed' inhibitor, but at high enz concs it looks like a non-compet inhibitor (Foulkes et al Eur J Biochem 132 309-313 9183). We treat it as non-compet, so it just turns the enz off without interacting with the binding site. Cohen et al ann rev bioch refer to results where conc is 1.5 to 1.8 uM. In order to get complete inhib of PP1, which is at 1.8 uM, we need >= 1.8 uM. |
I1 acting as a Substrate for an Enzyme in CaMKII_2003 Network
Enzyme Molecule /
Enzyme Activity | Accession Name | Pathway Name | Km (uM) | kcat (s^-1) | Ratio | Enzyme Type | Reagents | PKA-active /
PKA-phosph-I1 | CaMKII_2003
Accession No. : 49 | Shared_Object_
CaMKII_2003
Pathway No. : 201 | 7.5 | 9 | 4 | explicit E-S complex | Substrate
I1
Product
I1*
| | #s 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. Now, k1 = 3e-5, k2 = 36, k3 = 9 (still pretty fast). Also lower Km 1/3 so k1 = 1e-5 Cohen et al FEBS Lett 76:182-86 1977 say rate =30% PKA act on phosphokinase beta. |
I1 acting as a Product of an Enzyme in CaMKII_2003 Network
| | Enzyme Molecule /
Enzyme Activity | Accession Name | Pathway Name | Km (uM) | kcat (s^-1) | Ratio | Enzyme Type | Reagents | | 1 | CaM(Ca)n-CaNAB /
dephosph_inhib1 | CaMKII_2003
Accession No. : 49 | Shared_Object_
CaMKII_2003
Pathway No. : 201 | 4.97076 | 0.34 | 4 | explicit E-S complex | Substrate
I1*
Product
I1
| | 2 | PP2A /
PP2A-dephosph-I1
| CaMKII_2003
Accession No. : 49 | Shared_Object_
CaMKII_2003
Pathway No. : 201 | 7.82828 | 6 | 4.16667 | explicit E-S complex | Substrate
I1*
Product
I1
| | | PP2A does most of the dephosph of I1 at basal Ca levels. See the review by Cohen in Ann Rev Biochem 1989. For now, lets halve Km. k1 was 3.3e-6, now 6.6e-6 | | 3 | CaNAB-Ca4 /
dephosph_
inhib1_noCaM
| CaMKII_2003
Accession No. : 49 | Shared_Object_
CaMKII_2003
Pathway No. : 201 | 4.97076 | 0.034 | 4 | explicit E-S complex | Substrate
I1*
Product
I1
| | | The rates here are so slow I do not know if we should even bother with this enz reacn. These numbers are from Liu and Storm. Other refs suggest that the Km stays the same but the Vmax goes to 10% of the CaM stim levels. Prev: k1=2.2e-9, k2 = 0.0052, k3 = 0.0013 New : k1=5.7e-8, k2=.136, k3=.034 |
I1 acting as a Product in a reaction in CaMKII_2003 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 | | dissoc-PP1-I1 | CaMKII_2003
Accession No. : 49 | PP1
Pathway No. : 204 | 1
(s^-1) | 0
(uM^-1 s^-1) | - | - | Substrate
PP1-I1
Product
I1
PP1-active
| | Let us assume that the equil in this case is very far over to the right. This is probably safe. |
| Database compilation and code copyright (C) 2022, Upinder S. Bhalla and NCBS/TIFR
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