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Molecule Parameter List for PDE1

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

PDE1 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	1	0	0	1	0

Accession and Pathway Details

Accession Name	Accession No.	Accession Type	Pathway Link
MAPK_network_ 2003	50	Network	Shared_Object_MAPK_network_2003,  PKC,  PLA2,   PLCbeta,  Gq,  MAPK,   Ras,  EGFR,  Sos,   PLC_g,  CaMKII,  CaM,   PP1,  PP2B,  PKA,   AC
This is a network model of many pathways present at the neuronal synapse. The network has properties of temporal tuning as well as steady-state computational properties. In its default form the network is bistable.Bhalla US Biophys J. 2004 Aug;87(2):745-53

PDE1 acting as a Molecule in  MAPK_network_2003 Network

Name	Accession Name	Pathway Name	Initial Conc. (uM)	Volume (fL)	Buffered
PDE1	MAPK_network_ 2003 Accession No. : 50	AC Pathway No. : 221	2	1000	No
CaM-Dependent PDE. Amount calculated from total rate in brain vs. specific rate.

PDE1 acting as an Enzyme in  MAPK_network_2003 Network

Enzyme Molecule / Enzyme Activity	Accession Name	Pathway Name	Km (uM)	kcat (s^-1)	Ratio	Enzyme Type	Reagents
PDE1 / PDE1	MAPK_network_ 2003 Accession No. : 50	AC Pathway No. : 221	39.7	1.667	4.0012	explicit E-S complex	Substrate cAMP Product AMP
Rate is 1/6 of the CaM stim form. We'll just reduce all lf k1, k2, k3 so that the Vmax goes down 1/6.

PDE1 acting as a Substrate in a reaction in  MAPK_network_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
CaM_bind_PDE1	MAPK_network_ 2003 Accession No. : 50	AC Pathway No. : 221	720 (uM^-1 s^-1)	5 (s^-1)	Kd(bf) = 0.0069(uM)	-	Substrate CaM-Ca4 PDE1 Product CaM.PDE1
For olf epi PDE1, affinity is 7 nM. Assume same for brain. Reaction should be pretty fast. Assume kb = 5/sec. Then kf = 5 / (0.007 * 6e5) = 1.2e-3