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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	3	0

Accession and Pathway Details

Accession Name	Accession No.	Accession Type	Pathway Link
mTOR_pathway	92	Network	Shared_Object_mTOR_pathway,  AKT_mod,  S6Kinase,   PI3K_mod,  TrKB_mod,  mTOR_model,   MAPK,  PKC,  4E-BP_mod,   Ras,  Sos,  43S_complex,   CaM
This model consists of various sub-modules. They are as follows: 1) BDNF receptor signaling 2) AKT signaling 3) 4E-BP model 4) S6 Kinase model 5) CaMKIII model 6) Protein synthesis model 7) CaM 8) PKC 9) MAPK model.

Grb2 acting as a Molecule in  mTOR_pathway Network

Name	Accession Name	Pathway Name	Initial Conc. (uM)	Volume (fL)	Buffered
Grb2	mTOR_pathway Accession No. : 92	Shared_Object_ mTOR_pathway Pathway No. : 1097	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  mTOR_pathway 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_Shc	mTOR_pathway Accession No. : 92	PI3K_mod Pathway No. : 1100	1 (uM^-1 s^-1)	1 (s^-1)	Kd(bf) = 1(uM)	-	Substrate Grb2 Shc_star Product Shc_star_Grb2_ clx
2	Grb2_bind_Sos_ star	mTOR_pathway Accession No. : 92	Sos Pathway No. : 1107	0.025 (uM^-1 s^-1)	0.0168 (s^-1)	Kd(bf) = 0.672(uM)	-	Substrate Grb2 Sos_star Product Sos_star.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.
3	Grb2_bind_Sos	mTOR_pathway Accession No. : 92	Sos Pathway No. : 1107	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.