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Molecule Parameter List for CaM

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
CaM 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
  • Synaptic_
    Network
  • 16Network
    Shared_Object_Synaptic_Network PKC PLA2 
    PLCbeta Gq MAPK 
    Ras EGFR Sos 
    PLC_g CaMKII CaM 
    PP1 PP2B PKA 
    AC CaRegulation 
    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 Biophys J. 2002 Aug;83(2):740-52
    Bhalla US J Comput Neurosci. 2002 Jul-Aug;13(1):49-62

    CaM acting as a Molecule in  
    Synaptic_Network Network
    NameAccession NamePathway NameInitial Conc.
    (uM)
    Volume
    (fL)
    Buffered
    CaM
  • Synaptic_
    Network

    Accession No. : 16
  • CaM
    Pathway No. : 81
    201000No
    There is a LOT of this in the cell: upto 1% of total protein mass. (Alberts et al, Mol Biol. of the Cell, Garland Publishers) Say 25 uM. Meyer et al Science 256 1199-1202 1992 refer to studies saying it is comparable to CaMK levels.

    CaM acting as a Product of an Enzyme in  
    Synaptic_Network Network
    Enzyme Molecule /
    Enzyme Activity
    Accession NamePathway NameKm (uM)kcat (s^-1)RatioEnzyme TypeReagents
    PKC-active  /
  • PKC-phosph-ng-Ca
    M
  • Synaptic_
    Network

    Accession No. : 16
  • Shared_Object_
    Synaptic_
    Network

    Pathway No. : 70
  • 28.59480.354explicit E-S complexSubstrate
    neurogranin-CaM

    Product
    CaM
    neurogranin*
    Rates are 60% those of PKC-phosph-neurogranin. See Huang et al ABB 305:2 570-580 1993

    CaM acting as a Substrate in a reaction in  
    Synaptic_Network 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
    1CaM-TR2-bind-Ca
  • Synaptic_
    Network

    Accession No. : 16
  • CaM
    Pathway No. : 81
    72
    (uM^-2 s^-1)
    72
    (s^-1)
    Kd(af) = 1(uM)-Substrate
    Ca
    Ca
    CaM

    Product
    CaM-TR2-Ca2
      We use the Martin et al 1985 Eur J Biochem 151(3):543-550 rates here, plus the Drabikowski and Brzeska 1982 JBC 257(19):11584-11590 binding consts. All are scaled by 3X to cell temperature. kf = 2e-10 kb = 72 Stemmer & Klee 1994 Biochem 33:6859-6866 have values of : K1=.9, K2=1.1. Assume 1.0uM for both
    2
  • neurogranin-bind
    -CaM
  • Synaptic_
    Network

    Accession No. : 16
  • CaM
    Pathway No. : 81
    0.3
    (uM^-1 s^-1)
    1
    (s^-1)
    Kd(bf) = 3.3333(uM)-Substrate
    CaM
    neurogranin

    Product
    neurogranin-CaM
      Surprisingly, no direct info on rates from neurogranin at this time. These rates are based on GAP-43 binding studies. As GAP-43 and neurogranin share near identity in the CaM/PKC binding regions, and also similarity in phosph and dephosph rates, I am borrowing GAP-43 kinetic info. See Alexander et al JBC 262:13 6108-6113 1987



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