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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 asMoleculeSum total ofEnzymeSubstrate of an enzymeProduct of an enzymeSubstrate in ReactionProduct in Reaction
No. of occurrences1000030

Accession and Pathway Details
Accession NameAccession No.Accession TypePathway Link
  • Osc_Ca_
    IP3metabolism
  • 24Network
    MIPP CaMKII CaM 
    PKC IP3-3K Gq 
    PLCbeta 134_dephos 145_dephos 
    IP4-system IHP-system 1345_dephos 
    CaRegulation Othmer-Tang-model 
    This network models an oscillatory calcium response to GPCR mediated PLCbeta activation, alongwith detailed InsP3 metabolism in the neuron. It differs from the NonOsc_Ca_IP3metabolism network in the CaRegulation module and in InsP3 receptor kinetics. Details of InsP3 receptor kinetics have been adapted from the Othmer-Tang model for oscillatory Ca dynamics. Mishra J, Bhalla US. Biophys J. 2002 Sep;83(3):1298-316.

    AA acting as a Molecule in  
    Osc_Ca_IP3metabolism Network
    NameAccession NamePathway NameInitial Conc.
    (uM)
    Volume
    (fL)
    Buffered
    AA
  • Osc_Ca_
    IP3metabolism

    Accession No. : 24
  • PKC
    Pathway No. : 123
    501000Yes
    Arachidonic Acid. This messenger diffuses through membranes as well as cytosolically, has been suggested as a possible retrograde messenger at synapses.

    AA acting as a Substrate in a reaction in  
    Osc_Ca_IP3metabolism 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
    1
  • PKC-act-by-Ca-AA
  • Osc_Ca_
    IP3metabolism

    Accession No. : 24
  • PKC
    Pathway No. : 123
    0.0012
    (uM^-1 s^-1)
    0.1
    (s^-1)
    Kd(bf) = 83.3333(uM)-Substrate
    AA
    PKC-Ca

    Product
    PKC-Ca-AA*
      Ca-dependent AA activation of PKC. Note that this step combines the AA activation and also the membrane translocation. From Schaechter and Benowitz 1993 J Neurosci 13(10):4361
    2PKC-act-by-AA
  • Osc_Ca_
    IP3metabolism

    Accession No. : 24
  • PKC
    Pathway No. : 123
    0.0001
    (uM^-1 s^-1)
    0.1
    (s^-1)
    Kd(bf) = 833.3333(uM)-Substrate
    AA
    PKC-cytosolic

    Product
    PKC-AA*
      AA stimulates PKC activity even at rather low Ca. Schaechter and Benowitz 1993 J Neurosci 13(10):4361 Note that this one reaction combines the initial interaction and also membrane translocation.
    3PKC-n-DAG-AA
  • Osc_Ca_
    IP3metabolism

    Accession No. : 24
  • PKC
    Pathway No. : 123
    0.018
    (uM^-1 s^-1)
    2
    (s^-1)
    Kd(bf) = 111.1111(uM)-Substrate
    AA
    PKC-DAG

    Product
    PKC-DAG-AA
      This is one of the more interesting steps. Mechanistically it does not seem necessary at first glance. Turns out that one needs this step to quantitatively match the curves in Schaechter and Benowitz 1993 J Neurosci 13(10):4361 and Shinomura et al 1991 PNAS 88:5149-5153. There is a synergy between DAG and AA activation even at low Ca levels, which is most simply represented by this reaction. Tau is assumed to be fast. Kd comes from matching the experimental curves.



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