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Molecule Parameter List for PLA2*

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
PLA2* participated asMoleculeSum total ofEnzymeSubstrate of an enzymeProduct of an enzymeSubstrate in ReactionProduct in Reaction
No. of occurrences1000120

Accession and Pathway Details
Accession NameAccession No.Accession TypePathway Link
3d_fold_model8Network
Shared_Object_3d_fold_model PKC MAPK 
PLA2 Ras 
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, Ram PT, Iyengar R. Science. 2002 Aug 9;297(5583):1018-23.

PLA2* acting as a Molecule in  
3d_fold_model Network
NameAccession NamePathway NameInitial Conc.
(uM)
Volume
(fL)
Buffered
PLA2*3d_fold_model
Accession No. : 8
PLA2
Pathway No. : 57
01000No

PLA2* acting as a Product of an Enzyme in  
3d_fold_model Network
Enzyme Molecule /
Enzyme Activity
Accession NamePathway NameKm (uM)kcat (s^-1)RatioEnzyme TypeReagents
MAPK*  /
MAPK*
3d_fold_model
Accession No. : 8
  • Shared_Object_
    3d_fold_model

    Pathway No. : 54
  • 25.641204explicit E-S complexSubstrate
    PLA2-cytosolic

    Product
    PLA2*
    Km = 25uM @ 50 uM ATP and 1mg/ml MBP (huge XS of substrate) Vmax = 4124 pmol/min/ml at a conc of 125 pmol/ml of enz, so: k3 = .5/sec (rate limiting) k1 = (k2 + k3)/Km = (.5 + 0)/(25*6e5) = 2e-8 (#/cell)^-1 #s from Sanghera et al JBC 265 pp 52 , 1990. From Nemenoff et al JBC 268(3):1960-1964 - using Sanghera's 1e-4 ratio of MAPK to protein, we get k3 = 7/sec from 1000 pmol/min/mg fig 5

    PLA2* acting as a Substrate in a reaction in  
    3d_fold_model 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.
     NameAccession NamePathway NameKfKbKdtauReagents
    1PLA2*-Ca-act3d_fold_model
    Accession No. : 8
    PLA2
    Pathway No. : 57
    6
    (uM^-1 s^-1)
    0.1
    (s^-1)
    Kd(bf) = 0.0167(uM)-Substrate
    Ca
    PLA2*

    Product
    PLA2*-Ca
      To start off, same kinetics as the PLA2-Ca-act direct pathway. Oops ! Missed out the Ca input to this pathway first time round. Let's raise the forward rate about 3x to 5e-6. This will let us reduce the rather high rates we have used for the kenz on PLA2*-Ca. In fact, it may be that the rates are not that different, just that this pathway for getting the PLA2 to the memb is more efficien....
    2
  • dephosphorylate-
    PLA2*
  • 3d_fold_model
    Accession No. : 8
    PLA2
    Pathway No. : 57
    0.17
    (s^-1)
    0
    (s^-1)
    --Substrate
    PLA2*

    Product
    PLA2-cytosolic



    Database compilation and code copyright (C) 2022, Upinder S. Bhalla and NCBS/TIFR
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