Enter a Search String

Special character and space not allowed in the query term. Search string should be at least 2 characters long.

Search in:

ALL Accession Pathway Molecule Enzyme Reaction Connected to

Search for

Match

Anything Exact Word Starting With

By

Name Notes Model

Molecule Parameter List for AA

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

AA participated as	Molecule	Sum total of	Enzyme	Substrate of an enzyme	Product of an enzyme	Substrate in Reaction	Product in Reaction
No. of occurrences	1	0	0	0	5	4	0

Accession and Pathway Details

Accession Name	Accession No.	Accession Type	Pathway Link
Ajay_Bhalla_ 2007_Bistable	79	Network	Shared_Object_Ajay_Bhalla_2007_Bistable,  PKC,  PLA2,   MAPK,  Ras,  CaM
This is a model of ERKII signaling which is bistable due to feedback. The feedback occurs through ERKII phosphorylation of phospholipase A2 (PLA2), leading to increased production of arachidonic acid (AA), which activates protein kinase C (PKC) which activates c-Raf which is upstream of ERKII. The model is a highly simplified variant of more detailed bistable models of MAPK signaling (Bhalla US, Iyengar R. Science. 1999 Jan 15;283(5400):381-7, Ajay SM, Bhalla US. Eur J Neurosci. 2004 Nov;20(10):2671-80)

AA acting as a Molecule in  Ajay_Bhalla_2007_Bistable Network

Name	Accession Name	Pathway Name	Initial Conc. (uM)	Volume (fL)	Buffered
AA	Ajay_Bhalla_ 2007_Bistable Accession No. : 79	Shared_Object_ Ajay_Bhalla_ 2007_Bistable Pathway No. : 363	0	125.7	No

AA acting as a Product of an Enzyme in  Ajay_Bhalla_2007_Bistable Network

	Enzyme Molecule / Enzyme Activity	Accession Name	Pathway Name	Km (uM)	kcat (s^-1)	Ratio	Enzyme Type	Reagents
1	PLA2-Ca*  / kenz	Ajay_Bhalla_ 2007_Bistable Accession No. : 79	PLA2 Pathway No. : 365	19.9997	5.4	4	explicit E-S complex	Substrate APC Product AA
	10 x raise oct22 12 x oct 24, set k2 = 4 * k3
2	PIP2-PLA2*  / kenz	Ajay_Bhalla_ 2007_Bistable Accession No. : 79	PLA2 Pathway No. : 365	20	11.04	4	explicit E-S complex	Substrate APC Product AA
	10 X raise oct 22 12 X further raise oct 24 to allow for correct conc of enzyme
3	PIP2-Ca-PLA2*  / kenz	Ajay_Bhalla_ 2007_Bistable Accession No. : 79	PLA2 Pathway No. : 365	20.0003	36	4	explicit E-S complex	Substrate APC Product AA
	10 x raise oct 22 12 x and rescale for k2 = 4 * k3 convention oct 24 Increase further to get the match to expt, which was spoilt due to large accumulation of PLA2 in the enzyme complexed forms. Lets raise k3, leaving the others at k1 = 1.5e-5 and k2 = 144 since they are large already.
4	DAG-Ca-PLA2*  / kenz	Ajay_Bhalla_ 2007_Bistable Accession No. : 79	PLA2 Pathway No. : 365	19.9996	60	4	explicit E-S complex	Substrate APC Product AA
	10 X raise oct 22 12 X raise oct 24 + conversion to k2 =4 * k3
5	PLA2*-Ca  / kenz	Ajay_Bhalla_ 2007_Bistable Accession No. : 79	PLA2 Pathway No. : 365	20.0001	120	4	explicit E-S complex	Substrate APC Product AA
	This form should be 3 to 6 times as fast as the Ca-only form. I have scaled by 4x which seems to give a 5x rise. 10x raise Oct 22 12 x oct 24, changed k2 = 4 * k3

AA acting as a Substrate in a reaction in  Ajay_Bhalla_2007_Bistable 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-Ca-AA	Ajay_Bhalla_ 2007_Bistable Accession No. : 79	PKC Pathway No. : 364	0.0012 (uM^-1 s^-1)	0.1 (s^-1)	Kd(bf) = 83.3326(uM)	-	Substrate AA PKC-Ca Product PKC-Ca-AA*
	Schaechter and Benowitz We have to increase Kf for conc scaling Changed kf to 2e-9 on Sept 19, 94. This gives better match.
2	PKC-act-by-AA	Ajay_Bhalla_ 2007_Bistable Accession No. : 79	PKC Pathway No. : 364	0.0001 (uM^-1 s^-1)	0.1 (s^-1)	Kd(bf) = 833.3264(uM)	-	Substrate AA PKC-cytosolic Product PKC-AA*
	Raise kf from 1.667e-10 to 2e-10 to get better match to data.
3	PKC-n-DAG-AA	Ajay_Bhalla_ 2007_Bistable Accession No. : 79	PKC Pathway No. : 364	0.018 (uM^-1 s^-1)	2 (s^-1)	Kd(bf) = 111.113(uM)	-	Substrate AA PKC-DAG Product PKC-DAG-AA
	Reduced kf to 0.66X to match Shinomura et al data. Initial: kf = 3.3333e-9 New: 2e-9 Newer: 2e-8 kb was 0.2 now 2.
4	Degrade-AA	Ajay_Bhalla_ 2007_Bistable Accession No. : 79	PLA2 Pathway No. : 365	0.4 (s^-1)	0 (s^-1)	-	-	Substrate AA Product APC
	I need to check if the AA degradation pathway really leads back to APC. Anyway, it is a convenient buffered pool to dump it back into. For the purposes of the full model we use a rate of degradation of 0.2/sec Raised decay to 0.4 : see PLA35.g notes for Feb17