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Molecule Parameter List for DAG

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
DAG participated asMoleculeSum total ofEnzymeSubstrate of an enzymeProduct of an enzymeSubstrate in ReactionProduct in Reaction
No. of occurrences1000440

Accession and Pathway Details
Accession NameAccession No.Accession TypePathway Link
  • Ajay_Bhalla_
    2004_Feedback_
    Tuning
  • 78Network
    Shared_Object_Ajay_Bhalla_2004_Feedback_Tuning PKC PLA2 
    PLCbeta Gq MAPK 
    Ras EGFR Sos 
    PLC_g CaMKII CaM 
    PP1 PP2B PKA 
    AC 
    This model is taken from Ajay SM, Bhalla US. Eur J Neurosci. 2004 Nov;20(10):2671-80. This is the feedback model from Figure 8a.

    DAG acting as a Molecule in  
    Ajay_Bhalla_2004_Feedback_Tuning Network
    NameAccession NamePathway NameInitial Conc.
    (uM)
    Volume
    (fL)
    Buffered
    DAG
  • Ajay_Bhalla_
    2004_Feedback_
    Tuning

    Accession No. : 78
  • Shared_Object_
    Ajay_Bhalla_
    2004_Feedback_
    Tuning

    Pathway No. : 347
  • 01.5No

    DAG acting as a Product of an Enzyme in  
    Ajay_Bhalla_2004_Feedback_Tuning Network
     Enzyme Molecule /
    Enzyme Activity
    Accession NamePathway NameKm (uM)kcat (s^-1)RatioEnzyme TypeReagents
    1PLC-Ca  /
    PLC-Ca
  • Ajay_Bhalla_
    2004_Feedback_
    Tuning

    Accession No. : 78
  • PLCbeta
    Pathway No. : 350
    19.8413104explicit E-S complexSubstrate
    PIP2

    Product
    DAG
    IP3
        From Sternweis et al Phil Trans R Soc Lond 1992, also matched by Homma et al. k1 = 1.5e-5, now 4.2e-6 k2 = 70/sec; now 40/sec k3 = 17.5/sec; now 10/sec Note that the wording in Sternweis et al is ambiguous re the Km.
    2PLC-Ca-Gq  /
    PLCb-Ca-Gq
  • Ajay_Bhalla_
    2004_Feedback_
    Tuning

    Accession No. : 78
  • PLCbeta
    Pathway No. : 350
    5.00003484explicit E-S complexSubstrate
    PIP2

    Product
    DAG
    IP3
        From Sternweis et al, Phil Trans R Soc Lond 1992, and the values from other refs eg Homma et al JBC 263(14) pp6592 1988 match. k1 = 5e-5/sec k2 = 240/sec; now 120/sec k3 = 60/sec; now 30/sec Note that the wording in Sternweis et al is ambiguous wr. to the Km for Gq vs non-Gq states of PLC. K1 is still a bit too low. Raise to 7e-5 9 Jun 1996: k1 was 0.0002, changed to 5e-5
    3Ca.PLC_g  /
    PIP2_hydrolysis
  • Ajay_Bhalla_
    2004_Feedback_
    Tuning

    Accession No. : 78
  • PLC_g
    Pathway No. : 356
    97.2222144explicit E-S complexSubstrate
    PIP2

    Product
    DAG
    IP3
        Mainly Homma et al JBC 263:14 1988 pp 6592, but these parms are the Ca-stimulated form. It is not clear whether the enzyme is activated by tyrosine phosphorylation at this point or not. Wahl et al JBC 267:15 10447-10456 1992 say that the Ca_stim and phosph form has 7X higher affinity for substrate than control. This is close to Wahl's figure 7, which I am using as reference.
    4Ca.PLC_g*  /
    PIP2_hydrolysis
  • Ajay_Bhalla_
    2004_Feedback_
    Tuning

    Accession No. : 78
  • PLC_g
    Pathway No. : 356
    19.7917574explicit E-S complexSubstrate
    PIP2

    Product
    DAG
    IP3
        Mainly Homma et al JBC 263:14 1988 pp 6592, but these parms are the Ca-stimulated form. It is not clear whether the enzyme is activated by tyrosine phosphorylation at this point or not. Wahl et al JBC 267:15 10447-10456 1992 say that this has 7X higher affinity for substrate than control.

    DAG acting as a Substrate in a reaction in  
    Ajay_Bhalla_2004_Feedback_Tuning 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
    1PKC-act-by-DAG
  • Ajay_Bhalla_
    2004_Feedback_
    Tuning

    Accession No. : 78
  • PKC
    Pathway No. : 348
    0.008
    (uM^-1 s^-1)
    8.6348
    (s^-1)
    Kd(bf) = 1079.3729(uM)-Substrate
    DAG
    PKC-Ca

    Product
    PKC-Ca-DAG
      Need est of rate. Assume it is fast Obtained from param search kf raised 10 X : see Shinomura et al PNAS 88 5149-5153 1991. kf changed from 3.865e-7 to 2.0e-7 in line with closer analysis of Shinomura data. 26 June 1996: Corrected DAG data: reduce kf 15x from 2e-7 to 1.333e-8
    2PKC-n-DAG
  • Ajay_Bhalla_
    2004_Feedback_
    Tuning

    Accession No. : 78
  • PKC
    Pathway No. : 348
    0.0006
    (uM^-1 s^-1)
    0.1
    (s^-1)
    Kd(bf) = 166.6658(uM)-Substrate
    DAG
    PKC-cytosolic

    Product
    PKC-DAG
      kf raised 10 X based on Shinomura et al PNAS 88 5149-5153 1991 closer analysis of Shinomura et al: kf now 1e-8 (was 1.66e-8). Further tweak. To get sufficient AA synergy, increase kf to 1.5e-8 26 June 1996: Corrected DAG levels: reduce kf by 15x from 1.5e-8 to 1e-9
    3DAG-Ca-PLA2-act
  • Ajay_Bhalla_
    2004_Feedback_
    Tuning

    Accession No. : 78
  • PLA2
    Pathway No. : 349
    0.003
    (uM^-1 s^-1)
    4
    (s^-1)
    Kd(bf) = 1333.3467(uM)-Substrate
    DAG
    PLA2-Ca*

    Product
    DAG-Ca-PLA2*
      27 June 1996 Scaled kf down by 0.015 from 3.33e-7 to 5e-9 to fit with revised DAG estimates and use of mole-fraction to calculate eff on PLA2.
    4Degrade-DAG
  • Ajay_Bhalla_
    2004_Feedback_
    Tuning

    Accession No. : 78
  • PLCbeta
    Pathway No. : 350
    0.15
    (s^-1)
    0
    (s^-1)
    Not applicable**-Substrate
    DAG

    Product
    PC
      These rates are the same as for degrading IP3, but I am sure that they could be improved. Lets double kf to 0.2, since the amount of DAG in the cell should be <= 1uM. Need to double it again, for the same reason. kf now 0.5 27 June 1996 kf is now 0.02 to get 50 sec time course 30 Aug 1997: Raised kf to 0.11 to accomodate PLC_gamma 27 Mar 1998: kf now 0.15 for PLC_gamma
    ** This is a trasport reation between compartments of different volumes. Therefore Kd is not applicable. Please Note Kf, Kb units are in number of molecules instead of concentration



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