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Molecule Parameter List for CaM-Ca4

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-Ca4 participated asMoleculeSum total ofEnzymeSubstrate of an enzymeProduct of an enzymeSubstrate in ReactionProduct in Reaction
No. of occurrences1000052

Accession and Pathway Details
Accession NameAccession No.Accession TypePathway Link
  • AMPAR_CaMKII_
    weak_coupling
  • 65Network
    Shared_Object_AMPAR_CaMKII_weak_coupling CaMKII CaM 
    PP1 PP2B PP1_PSD 
    AMPAR PKA AC 
    AMPAR_memb PP1_CaMKII_PSD CaMKII_PSD 
    This is a model of weak coupling between the AMPAR traffikcing bistability, and the CaMKII autophosphorylation bistability. In this model, there are three stable states: Both off, AMPAR on, or both on. The fourth possible state: CaMKII on but AMPAR off, is not truly stable, since over the course of hours the AMPAR also turns on.

    CaM-Ca4 acting as a Molecule in  
    AMPAR_CaMKII_weak_coupling Network
    NameAccession NamePathway NameInitial Conc.
    (uM)
    Volume
    (fL)
    Buffered
    CaM-Ca4
  • AMPAR_CaMKII_
    weak_coupling

    Accession No. : 65
  • Shared_Object_
    AMPAR_CaMKII_
    weak_coupling

    Pathway No. : 281
  • 00.09No

    CaM-Ca4 acting as a Substrate in a reaction in  
    AMPAR_CaMKII_weak_coupling 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
    1CaMKII-bind-CaM
  • AMPAR_CaMKII_
    weak_coupling

    Accession No. : 65
  • CaMKII
    Pathway No. : 282
    49.9997
    (uM^-1 s^-1)
    5
    (s^-1)
    Kd(bf) = 0.1(uM)-Substrate
    CaM-Ca4
    CaMKII

    Product
    CaMKII-CaM
      This is tricky. There is some cooperativity here arising from interactions between the subunits of the CAMKII holoenzyme. However, the stoichiometry is 1. Kb/Kf = 6e4 #/cell. Rate is fast (see Hanson et al Neuron 12 943-956 1994) so lets say kb = 10. This gives kf = 1.6667e-4 H&S AnnRev Biochem 92 give tau for dissoc as 0.2 sec at low Ca, 0.4 at high. Low Ca = 100 nM = physiol.
    2
  • CaMK-thr286-bind
    -CaM
  • AMPAR_CaMKII_
    weak_coupling

    Accession No. : 65
  • CaMKII
    Pathway No. : 282
    1000.19
    (uM^-1 s^-1)
    0.1
    (s^-1)
    Kd(bf) = 0.0001(uM)-Substrate
    CaM-Ca4
    CaMKII-thr286

    Product
  • CaMKII-thr286*-C
    aM

  •   Affinity is up 1000X. Time to release is about 20 sec, so the kb is OK at 0.1 This makes Kf around 1.6666e-3
    3
  • CaMCa4-bind-CaNA
    B
  • AMPAR_CaMKII_
    weak_coupling

    Accession No. : 65
  • PP2B
    Pathway No. : 285
    599.994
    (uM^-1 s^-1)
    1
    (s^-1)
    Kd(bf) = 0.0017(uM)-Substrate
    CaM-Ca4
    CaNAB-Ca4

    Product
    CaM_Ca_n-CaNAB
    4CaM-bind-AC1
  • AMPAR_CaMKII_
    weak_coupling

    Accession No. : 65
  • AC
    Pathway No. : 289
    49.9997
    (uM^-1 s^-1)
    1
    (s^-1)
    Kd(bf) = 0.02(uM)-Substrate
    AC1
    CaM-Ca4

    Product
    AC1-CaM
      Half-max at 20 nM CaM (Tang et al JBC 266:13 8595-8603 1991 kb/kf = 20 nM = 12000 #/cell so kf = kb/12000 = kb * 8.333e-5
    5CaM_bind_PDE1
  • AMPAR_CaMKII_
    weak_coupling

    Accession No. : 65
  • AC
    Pathway No. : 289
    719.982
    (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

    CaM-Ca4 acting as a Product in a reaction in  
    AMPAR_CaMKII_weak_coupling 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
    1equilib
  • AMPAR_CaMKII_
    weak_coupling

    Accession No. : 65
  • Shared_Object_
    AMPAR_CaMKII_
    weak_coupling

    Pathway No. : 281
  • 540
    (s^-1)
    60
    (s^-1)
    Not applicable**-Substrate
    CaM-Ca4-PSD

    Product
    CaM-Ca4
      Diffusional equilibrium between PSD- and cytosolic compartment. According to D. Bary in Cell Movements 2nd ed 2001 D for proteins is 5e-7 cm^2/s giving 10 ms for a translocation of 1 um.
    2CaM-Ca3-bind-Ca
  • AMPAR_CaMKII_
    weak_coupling

    Accession No. : 65
  • Shared_Object_
    AMPAR_CaMKII_
    weak_coupling

    Pathway No. : 281
  • 0.465
    (uM^-1 s^-1)
    10
    (s^-1)
    Kd(bf) = 21.5054(uM)-Substrate
    Ca
    CaM-Ca3

    Product
    CaM-Ca4
      Use K3 = 21.5 uM here from Stemmer and Klee table 3. kb/kf =21.5 * 6e5 so kf = 7.75e-7, kb = 10



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