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Molecule Parameter List for Grb2 | 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 |
| Grb2 participated as | Molecule | Sum total of | Enzyme | Substrate of an enzyme | Product of an enzyme | Substrate in Reaction | Product in Reaction | | No. of occurrences | 1 | 0 | 0 | 0 | 0 | 2 | 0 |
Accession and Pathway Details | |
Grb2 acting as a Molecule in EGFR_MAPK Network
| Name | Accession Name | Pathway Name | Initial Conc.
(uM) | Volume
(fL) | Buffered | | Grb2 | EGFR_MAPK
Accession No. : 58 | Sos
Pathway No. : 233 | 1 | 1000 | No | | There is probably a lot of it in the cell: it is also known as Ash (abundant src homology protein I think). Also Waters et al JBC 271:30 18224 1996 say that only a small fraction of cellular Grb is precipitated out when SoS is precipitated. As most of the Sos seems to be associated with Grb2, it would seem like there is a lot of the latter. Say 1 uM. I haven't been able to find a decent.... |
Grb2 acting as a Substrate in a reaction in EGFR_MAPK 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 | Grb2_bind_Sos* | EGFR_MAPK
Accession No. : 58 | Sos
Pathway No. : 233 | 0.025
(uM^-1 s^-1) | 0.0168
(s^-1) | Kd(bf) = 0.672(uM) | - | Substrate
Grb2
Sos*
Product
Sos*.Grb2
| | | Same rates as Grb2_bind_Sos: Porfiri and McCormick JBC 271:10 pp 5871 1996 show that the binding is not affected by the phosph. | | 2 | Grb2_bind_Sos | EGFR_MAPK
Accession No. : 58 | Sos
Pathway No. : 233 | 0.025
(uM^-1 s^-1) | 0.0168
(s^-1) | Kd(bf) = 0.672(uM) | - | Substrate
Grb2
Sos
Product
Sos.Grb2
| | | As there are 2 SH3 domains, this reaction could be 2nd order. I have a Kd of 22 uM from peptide binding (Lemmon et al JBC 269:50 pg 31653). However, Chook et al JBC 271:48 pg30472 say it is 0.4uM with purified proteins, so we believe them. They say it is 1:1 binding. |
| Database compilation and code copyright (C) 2022, Upinder S. Bhalla and NCBS/TIFR
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