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Molecule Parameter List for SHC* | 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 |
Accession and Pathway Details | |
| Accession Name | Accession No. | Accession Type | Pathway Link | Ajay_Bhalla_
2004_Feedback_
Tuning | 78 | Network |
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. |
SHC* acting as a Molecule in Ajay_Bhalla_2004_Feedback_Tuning Network
SHC* acting as a Product of an Enzyme in Ajay_Bhalla_2004_Feedback_Tuning Network
Enzyme Molecule /
Enzyme Activity | Accession Name | Pathway Name | Km (uM) | kcat (s^-1) | Ratio | Enzyme Type | Reagents | L.EGFR /
phosph_Shc | Ajay_Bhalla_
2004_Feedback_
Tuning
Accession No. : 78 | EGFR
Pathway No. : 354 | 0.833354 | 0.2 | 4 | explicit E-S complex | Substrate
SHC
Product
SHC*
| | Rates from Okada et al JBC 270:35 pp 20737 1995 Km = 0.70 to 0.85 uM, Vmax = 4.4 to 5.0 pmol/min. Unfortunately the amount of enzyme is not known, the prep is only partially purified. Time course of phosph is max within 30 sec, falls back within 20 min. Ref: Sasaoka et al JBC 269:51 32621 1994. Use k3 = 0.1 based on this tau. |
SHC* 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. |
| | Name | Accession Name | Pathway Name | Kf | Kb | Kd | tau | Reagents | | 1 | dephosph_Shc | Ajay_Bhalla_
2004_Feedback_
Tuning
Accession No. : 78 | EGFR
Pathway No. : 354 | 0.0017
(s^-1) | 0
(s^-1) | - | - | Substrate
SHC*
Product
SHC
| | | Time course of decline of phosph is 20 min. Part of this is the turnoff time of the EGFR itself. Lets assume a tau of 10 min for this dephosph. It may be wildly off. | | 2 | Shc_bind_
Sos.Grb2 | Ajay_Bhalla_
2004_Feedback_
Tuning
Accession No. : 78 | Sos
Pathway No. : 355 | 0.5
(uM^-1 s^-1) | 0.1
(s^-1) | Kd(bf) = 0.2(uM) | - | Substrate
SHC*
Sos.Grb2
Product
Shc*.Sos.Grb2
| | | Sasaoka et al JBC 269:51 pp 32621 1994, table on pg 32623 indicates that this pathway accounts for about 50% of the GEF activation. (88% - 39%). Error is large, about 20%. Fig 1 is most useful in constraining rates. Chook et al JBC 271:48 pp 30472, 1996 say that the Kd is 0.2 uM for Shc binding to EGFR. The Kd for Grb direct binding is 0.7, so we'll ignore it. |
| Database compilation and code copyright (C) 2022, Upinder S. Bhalla and NCBS/TIFR
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