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Molecule Parameter List for PKC-DAG-memb*

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
PKC-DAG-memb* participated asMoleculeSum total ofEnzymeSubstrate of an enzymeProduct of an enzymeSubstrate in ReactionProduct in Reaction
No. of occurrences1100001

Accession and Pathway Details
Accession NameAccession No.Accession TypePathway Link
  • MAPK-bistability
    -fig1c
  • 35Network
    Shared_Object_MAPK-bistability-fig1c Sos PKC 
    MAPK PLA2 Ras 
    PDGFR 
    Model for figure 1c in Bhalla US et al. Science (2002) 297(5583):1018-23.
    The demo for this figure is available here. This synaptic signaling model is without the MKP-1 feedback, so it is bistable and remains so over long periods.

    PKC-DAG-memb* acting as a Molecule in  
    MAPK-bistability-fig1c Network
    NameAccession NamePathway NameInitial Conc.
    (uM)
    Volume
    (fL)
    Buffered
    PKC-DAG-memb*
  • MAPK-bistability
    -fig1c

    Accession No. : 35
  • PKC
    Pathway No. : 181
    01000No
    Active, membrane attached form of Ca.DAG.PKC complex.

    PKC-DAG-memb* acting as a Summed Molecule in  
    MAPK-bistability-fig1c Network
    Accession NamePathway NameTargetInput
  • MAPK-bistability
    -fig1c

    Accession No. : 35
  • Shared_Object_
    MAPK-bistability
    -fig1c

    Pathway No. : 179
  • PKC-activePKC-DAG-AA*
    PKC-Ca-memb*
    PKC-Ca-AA*
    PKC-DAG-memb*
    PKC-basal*
    PKC-AA*
    This is the total active PKC. It is the sum of the respective activities of PKC-basal* PKC-Ca-memb* PKC-DAG-memb* PKC-Ca-AA* PKC-DAG-AA* PKC-AA* I treat PKC here in a two-state manner: Either it is in an active state (any one of the above list) or it is inactive. No matter what combination of stimuli activate the PKC, I treat it as having the same activity. The scaling comes in through the relative amounts of PKC which bind to the respecive stimuli. The justification for this is the mode of action of PKC, which like most Ser/Thr kinases has a kinase domain normally bound to and blocked by a regulatory domain. I assume that all the activators simply free up the kinase domain. A more general model would incorporate a different enzyme activity for each combination of activating inputs, as well as for each substrate. The current model seems to be a decent and much simpler approximation for the available data. One caveat of this way of representing PKC is that the summation procedure assumes that PKC does not saturate with its substrates. If this assumption fails, then the contributing PKC complexes would experience changes in availability which would affect their balance. Given the relatively low percentage of PKC usually activated, and its high throughput as an enzyme, this is a safe assumption under physiological conditions.

    PKC-DAG-memb* acting as a Product in a reaction in  
    MAPK-bistability-fig1c 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
    PKC-DAG-to-memb
  • MAPK-bistability
    -fig1c

    Accession No. : 35
  • PKC
    Pathway No. : 181
    1
    (s^-1)
    0.1
    (s^-1)
    Keq = 0.1(uM)0.909secSubstrate
    PKC-Ca-DAG

    Product
    PKC-DAG-memb*
    membrane translocation step for Ca.DAG.PKC complex. Rates constrained from Shinomura et al 1991 PNAS 88:5149-5153 and Schaechter and Benowitz 1993 J Neurosci 13(10):4361 as derived in the references cited in PKC general notes.



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